Interference mitigation for multi-band wireless communication systems

Abstract

Systems and methods are disclosed for providing interference mitigation for a multi-band wireless communication system. An apparatus can include a wireless transceiver operating on different frequency bands and circuitry to receive a first signal via a first frequency band and to transmit a second signal via a second frequency band. The second signal can cause interference to the first signal. The interference can include a central portion and a tail portion. A filter can reduce the central portion of the interference from samples of the second signal to provide filtered sample signals, a carrier frequency of the filtered sample signals can be adjusted to a different carrier frequency or baseband to provide converted sample signals. An equalizer can identify the tail portion of the interference from the converted sample signals to provide a third signal, a demodulator can use the third signal to reduce the interference from the first signal.

Description

Technical Field

[0001] This disclosure generally relates to systems and methods for enhancing signal integrity in wireless communication devices, including but not limited to interference mitigation techniques for transceivers used in multiple wireless communication frequency bands. Background Technology

[0002] Network communication can be implemented using various wireless communication technologies that support high-speed data transmission across multiple communication frequency bands, including, for example, Wi-Fi, Bluetooth, or other radio frequency (RF) systems. These systems may sometimes encounter challenges related to interference and signal attenuation, which can affect their performance and user experience. Summary of the Invention

[0003] This disclosure provides a circuit system for mitigating signal interference caused by transmitted transceiver signals that interfere with another signal received concurrently via different transceivers within the same device. When a wireless device transmits a signal via a first transceiver operating in one frequency band (e.g., 6 GHz Wi-Fi) while simultaneously receiving a second signal in an adjacent channel or band (e.g., 5 GHz Wi-Fi), the transmitted signal may introduce interference, thereby degrading the quality of the received signal. This problem can be exacerbated by the fact that the power of the transmitted signal is greater than the power of the received signal, causing the tail portion of the transmitted signal to affect the received signal. In such cases, the wireless device may reduce its transmit power, thereby affecting its own signal transmission range, in order to reduce interference at the received signal. To overcome this challenge, this technical solution utilizes an interference mitigation circuit system integrating a bandpass filter, converter, and equalizer to effectively mitigate interference from the received signal. In this way, this technical solution allows the system to maintain high-quality communication even in environments with significant interference.

[0004] At least one aspect of this technical solution relates to an apparatus. The apparatus may include a plurality of wireless transceivers. Each of the plurality of wireless transceivers may operate on different frequency bands in a plurality of frequency bands. The apparatus may include a circuitry for receiving a first signal via a first frequency band in the plurality of frequency bands. The circuitry may be configured to transmit a second signal via a second frequency band in the plurality of frequency bands. The second signal may interfere with the first signal. The interference may include a central portion and a tail portion. The circuitry may include a bandpass filter for reducing the central portion of the interference from samples of the second signal to provide a filtered sample signal. The circuitry may include a converter for adjusting the carrier frequency of the filtered sample signal relative to the carrier frequency of the second signal to provide a converted sample signal. The circuitry may include an equalizer for identifying the tail portion of the interference from the converted sample signal to provide a third signal to cancel the interference from the first signal. The circuitry may include a demodulator for reducing the interference from the first signal based at least on the third signal.

[0005] The plurality of wireless transceivers may include a first wireless transceiver for receiving the first signal and a second wireless transceiver for transmitting the second signal. The first and second wireless transceivers may each be configured for Wi-Fi wireless communication. The first wireless transceiver may include a first bandpass filter, a first converter, the equalizer, and the demodulator, and the second wireless transceiver includes the bandpass filter and the converter. The first wireless transceiver may be configured for Wi-Fi wireless communication via a 5 GHz frequency band, and the second wireless transceiver may be configured for Wi-Fi wireless communication via a 6 GHz frequency band.

[0006] The bandpass filter may be configured to receive samples of the first signal from the output of an amplifier of one of the plurality of wireless transceivers configured to transmit the second signal. The bandpass filter may be configured to reduce frequencies outside a predetermined range corresponding to the central portion from the samples of the first signal. The converter may be configured to adjust the carrier frequency of the filtered sample signal to provide the converted sample signal at a baseband frequency.

[0007] The equalizer can be configured to set one or more parameters that control the equalizer to adjust at least one of the gain of the third signal based on the gain of the first signal or the frequency response of the third signal based on the frequency response of the first signal. The equalizer can be configured to set the one or more parameters to adjust the third signal to cancel distortion in the first signal. The equalizer can utilize a least squares function to reduce the difference between the signal generated based on the third signal and the first signal. The least squares function can be configured to use a least mean square (LMS) operation to track changes in the first signal over a time interval. The LMS operation can be configured to iteratively adjust the parameters of the equalizer to control the third signal to reduce the error between the signal generated using the third signal and the first signal. The demodulator can be configured to reduce interference from the first signal by subtracting the signal generated by the equalizer using the third signal from the first signal.

[0008] One aspect of this technical solution relates to a method. The method may include receiving a first signal by a circuit system comprising a plurality of wireless transceivers via a first frequency band of a plurality of frequency bands. Each of the plurality of transceivers may operate on a different frequency band of the plurality of frequency bands. The method may include transmitting a second signal by the circuit system via a second frequency band of the plurality of frequency bands, the second signal interfering with the first signal, the interference including a central portion and a tail portion. The method may include reducing the central portion of the interference from samples of the second signal by a bandpass filter to provide a filtered sample signal. The method may include adjusting the carrier frequency of the filtered sample signal relative to a carrier frequency of the second signal by a converter to provide a converted sample signal. The method may include identifying the tail portion of the interference from the converted sample signal by an equalizer to provide a third signal to cancel the interference from the first signal. The method may include reducing the interference from the first signal by a demodulator based at least on the third signal.

[0009] The plurality of wireless transceivers may include a first wireless transceiver for receiving the first signal and a second wireless transceiver for transmitting the second signal, wherein the first and second wireless transceivers may each be configured for Wi-Fi wireless communication. The first wireless transceiver may include a first bandpass filter, a first converter, the equalizer, and the demodulator, and the second wireless transceiver includes the bandpass filter and the converter. The first wireless transceiver may be configured for Wi-Fi wireless communication via a 5 GHz band or a 6 GHz band, and the second wireless transceiver may be configured for Wi-Fi wireless communication via the 5 GHz band or the 6 GHz band.

[0010] The method may include receiving samples of the first signal from the output of an amplifier of one of the plurality of wireless transceivers using the bandpass filter. The wireless transceivers may be configured to transmit the second signal. The method may also include reducing frequencies outside a predetermined range corresponding to the central portion from the samples of the first signal using the bandpass filter.

[0011] The method may include adjusting the carrier frequency of the filtered sample signal by the converter to provide the converted sample signal at a baseband frequency. The method may also include setting one or more parameters by the equalizer, the parameters controlling the equalizer to adjust at least one of: the gain of the third signal according to the gain of the first signal, and the frequency response of the third signal according to the frequency response of the first signal, to counteract distortion in the first signal.

[0012] The method may include reducing the difference between a signal generated based on the third signal and a first signal using a least-squares function of the equalizer. The least-squares function may be configured to track changes in the first signal over a time interval using a least-mean-squares (LMS) operation. The method may also include iteratively adjusting the third signal via parameters used to control the equalizer to reduce the error in the difference between the signal generated using the third signal and the first signal.

[0013] One aspect of this technical solution relates to a circuit system. The circuit system may include a plurality of wireless transceivers configured to operate on a first frequency band of a plurality of frequency bands for Wi-Fi wireless communication and a second frequency band of the plurality of frequency bands for Wi-Fi wireless communication. The plurality of wireless transceivers may be configured to receive a first signal via the first frequency band. The plurality of wireless transceivers may transmit a second signal via the second frequency band, the second signal interfering with the first signal. The interference may include a central portion and a tail portion. The plurality of wireless transceivers may include a bandpass filter for reducing the central portion of the interference from samples of the second signal to provide a filtered sample signal. The plurality of wireless transceivers may include a converter for adjusting the carrier frequency of the filtered sample signal relative to the carrier frequency of the second signal to provide a converted sample signal. The plurality of wireless transceivers may include an equalizer for identifying the tail portion of the interference from the converted sample signal to provide a third signal to cancel the interference from the first signal. The plurality of wireless transceivers may include a demodulator for reducing the interference from the first signal, at least based on the third signal. Attached Figure Description

[0014] These and other aspects and features of this embodiment will become apparent to those skilled in the art after reviewing the following description of specific embodiments in conjunction with the accompanying drawings.

[0015] Figure 1 It is a diagram depicting an instance communication environment having a communication system according to one or more embodiments.

[0016] Figure 2 This is a schematic block diagram of a computing system according to an embodiment.

[0017] Figure 3A It is an example system circuit system used to provide interference mitigation for multi-band wireless communication systems implemented with dual transceiver configurations having dedicated transceiver antennas.

[0018] Figure 3B This is an example curve of the transmitted signal with interference in the central and tail sections, plotted within a certain frequency range.

[0019] Figure 4 It is an example system circuit system used to provide interference mitigation for multi-band wireless communication systems implemented with a configuration having a shared multi-band antenna.

[0020] Figure 5 It is an example system circuit system used to provide interference mitigation for multi-band wireless communication systems implemented in a configuration using a power amplifier model.

[0021] Figure 6A and 6B This section describes an example of a system configured with multi-band integrated circuits to provide baseband interference mitigation for the access point core and front-end modules of a wireless communication device.

[0022] Figure 7 This is a flowchart of a method for providing interference mitigation in multi-band wireless communication systems. Detailed Implementation

[0023] This embodiment will now be described in detail with reference to the accompanying drawings, which are provided as illustrative examples of the embodiments to enable those skilled in the art to practice embodiments and alternatives that are obvious to those skilled in the art. The following figures and examples are not intended to limit the scope of this embodiment to a single embodiment, but rather other embodiments are possible by interchangeing some or all of the described or illustrated elements, or those elements that are obvious to those skilled in the art. Some elements of this embodiment may be implemented partially or entirely using known components, and only those parts of such known components necessary for understanding this embodiment will be described, and detailed descriptions of other parts of such known components will be omitted to avoid obscuring this embodiment. The embodiments described in the illustrative context are not intended to be limited thereto. For example, as will be apparent to those skilled in the art, embodiments described as being implemented in software are not limited to this embodiment, but may include embodiments implemented in hardware or a combination of software and hardware, and vice versa, unless otherwise specified herein. Embodiments showing a singular number of components in this specification should not be considered limiting; rather, this disclosure is intended to cover other embodiments that include a plurality of the same components, and vice versa, unless expressly stated herein. Furthermore, the applicant does not intend any term in the specification or claims to be given a rare or special meaning unless so explicitly stated. Additionally, this embodiment covers current and future known equivalents of known components mentioned herein by way of illustration.

[0024] Wireless communication devices can be configured to communicate using multiple wireless transceivers. A wireless transceiver (also referred to herein as a transceiver) can be any circuit or electronic device that may include the functions of a transmitter, a receiver, or both, combined into a single package, circuit, or device. Wireless transceivers can be configured to communicate at different wireless communication frequencies. A wireless communication band (also referred to herein as a band) can be any range of frequencies within which radio signals are wirelessly transmitted or received. The signal may contain any electrical or electromagnetic radiation or wave that can deliver information and is transmitted or received by the transceiver.

[0025] Depending on the system configuration, a transceiver may transmit a first signal via a frequency band (e.g., 6 GHz for Wi-Fi), while another transceiver may simultaneously receive a second signal in a nearby or adjacent frequency band (e.g., 5 GHz). In such examples, the transmitted signal may introduce interference that degrades the quality of the received signal, especially when the power of the transmitted signal is significantly greater than that of the received signal. Interference may include any interruption or alteration of the signal (e.g., a weaker received signal) caused by the presence of an unwanted stronger transmitted signal, resulting in distortion in the communication system. The power difference between the transmitted and received signals may cause the tail portion of the interfering signal (e.g., a portion of the interfering signal before or after the central portion of the interference and with reduced amplitude or intensity) to interfere with the received signal. This can occur even after applying a bandpass filter to attenuate or remove the central component of the interference. In such cases, the wireless device may proportionally reduce its transmit power to mitigate this interference, thereby adversely affecting the effective range of the transmitted signal in order to salvage the quality of the received signal.

[0026] To overcome these challenges, this technical solution proposes a circuit system to mitigate signal interference caused by transceiver transmitted signals, which affects the quality of another signal simultaneously received by different transceivers within the same device. This solution may include an interference mitigation circuit system that integrates a bandpass filter, a down-converter, and an adaptive algorithm to dynamically adjust the signal processing parameters of the equalizer to eliminate both the center and tail components of the interfering signal. In this way, this technical solution provides a more effective technique for mitigating interference from received signals, thereby improving signal clarity and overall system robustness.

[0027] The following description of sections of the specification and their corresponding contents may be helpful for reading the descriptions of the various embodiments described below:

[0028] Section A describes a wireless device computing environment that may be useful for practicing the embodiments described herein; and

[0029] Chapter B describes an implementation of baseband interference cancellation.

[0030] A. Wireless device computing environment

[0031] refer to Figure 1The illustration depicts a diagram of an example communication environment 100 including communication systems (communication devices or circuit systems) 105, 108 according to one or more embodiments. In one embodiment, communication system 105 includes a baseband circuit system 110 and a transmitter circuit system 120, and communication system 108 includes a baseband circuit system 150 and a receiver circuit system 140. On one hand, communication system 105 is considered a transmitter communication system, and communication system 108 is considered a receiver communication system. These components operate together to exchange data (e.g., messages or frames) over a wireless medium. In one or more embodiments, these components are embodied as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or any combination thereof. In some embodiments, communication systems 105, 108 include... Figure 1 The components shown may include more, fewer, or different components. For example, each of communication systems 105, 108 includes a transceiver circuitry to allow bidirectional communication between or with other communication systems. In some embodiments, each of communication systems 105, 108 may have components similar to those shown in the diagram. Figure 2 The configuration of the computing system 200 shown in the image is similar to that of the system in the image.

[0032] The baseband circuitry 110 of the communication system 105 is a circuitry system that generates baseband data 115 for transmission. The baseband data 115 contains information data (e.g., signals) for transmission at a baseband frequency. In one method, the baseband circuitry 110 includes an encoder 130 that encodes the data and generates or outputs parity bits. On one hand, the baseband circuitry 110 (or encoder 130) obtains a generator matrix or parity matrix, or uses a previously generated generator matrix or parity matrix, and encodes the information data by applying it to the generator matrix or parity matrix to obtain codewords. In some embodiments, the baseband circuitry 110 stores one or more generator matrices or one or more parity matrices conforming to any IEEE 802.11 standard for WLAN communication. The baseband circuitry 110 retrieves the stored generator matrix or stored parity matrix in response to detecting information data to be transmitted or in response to receiving an instruction to encode the information data. In one method, baseband circuitry 110 generates parity bits based on a portion of a generator matrix or using a parity matrix and appends the parity bits to information bits to form a codeword. Baseband circuitry 110 generates baseband data 115 containing the codeword for communication system 108 and provides baseband data 115 to transmitter circuitry 120.

[0033] The transmitter circuitry 120 of the communication system 105 includes or corresponds to a circuitry that receives baseband data 115 from the baseband circuitry 110 and transmits a radio signal 125 based on the baseband data 115. In one configuration, the transmitter circuitry 120 is coupled between the baseband circuitry 110 and an antenna (not shown). In this configuration, the transmitter circuitry 120 upconverts the baseband data 115 from the baseband circuitry 110 onto a carrier signal to generate a radio signal 125 at an RF frequency (e.g., 10 MHz to 60 GHz) and transmits the radio signal 125 via the antenna.

[0034] The receiver circuitry 140 of communication system 108 is a circuitry that receives radio signal 125 from communication system 105 and obtains baseband data 145 from the received radio signal 125. In one configuration, receiver circuitry 140 is coupled between baseband circuitry 150 and an antenna (not shown). In this configuration, receiver circuitry 140 receives radio signal 125 through the antenna and down-converts radio signal 125 at RF frequencies according to a carrier signal to obtain baseband data 145 from radio signal 125. Receiver circuitry 140 then provides baseband data 145 to baseband circuitry 150.

[0035] The baseband circuitry system 150 of the communication system 108 includes or corresponds to a circuitry system that receives baseband data 145 from the receiver circuitry system 140 and obtains information data from the received baseband data 145. In one embodiment, the baseband circuitry system 150 includes a decoder 160 that extracts information and parity bits from the baseband data 145. The decoder 160 decodes the baseband data 145 to obtain information data generated by the baseband circuitry system 110 of the communication system 105.

[0036] In some embodiments, each of the baseband circuit system 110 (including encoder 130), transmitter circuit system 120, receiver circuit system 140, and baseband circuit system 150 (including decoder 160) may be one or more processors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or any combination thereof.

[0037] Figure 2This is a schematic block diagram of a computing system 200 that can be used to generate transmissions via a wireless communication device (e.g., 105 or 108). The illustrated example computing system 200 (also referred to as computer system 200) may include one or more processors 201 that communicate directly or indirectly with memory 206 via a communication system 204 (e.g., a bus), at least one network interface controller 203 having a network interface port for connection to a network (not shown), and other components such as input / output (“I / O”) components 205. Typically, the processor(s) 201 can execute instructions (e.g., computer code or programs) received from memory (e.g., 206 or 202). The illustrated processor(s) 201 may be incorporated into or connected to cache memory 202. In some examples, instructions are read from memory 206 into cache memory 202 and executed by the processor(s) 201 from cache memory 202. The computing system 200 may not necessarily contain... Figure 2 All of these components shown in the document may contain Figure 2 Other components not shown in the image.

[0038] More specifically, the processors 201 may be any logic circuit system that processes instructions (e.g., instructions fetched from memory 206 or cache 202). In many embodiments, the processors 201 are microprocessor units or dedicated processors. The computing device 200 may be based on any processor or group of processors capable of operating as described herein. The processors 201 may be single-core or multi-core processors. The processors 201 may be multiple dissimilar processors.

[0039] Memory 206 may be any device suitable for storing computer-readable data. Memory 206 may be a device with fixed storage or a device for reading removable storage media. Examples include all forms of volatile memory (e.g., RAM), non-volatile memory, media and storage devices, semiconductor memory devices (e.g., EPROM, EEPROM, SDRAM, and flash memory devices), magnetic disks, magneto-optical disks, and optical disks (e.g., CD-ROM, DVD-ROM, or Blu-ray® optical disks). Computing system 200 may have any number of memory devices 206.

[0040] Cache memory 202 is typically a form of computer memory placed close to processor(s) 201 for fast read times. In some embodiments, cache memory 202 is part of processor(s) 201, or on the same chip as processor(s) 201. In some embodiments, multiple levels of cache 202 exist, such as L2 and L3 cache layers.

[0041] Network interface controller 203 manages data exchange via a network interface (sometimes referred to as a network interface port). Network interface controller 203 handles the physical and data link layers of the OSI model for network communication. In some embodiments, some of the tasks of the network interface controller are handled by one or more of processors 201. In some embodiments, network interface controller 203 is part of processor 201. In some embodiments, computing system 200 has multiple network interfaces controlled by a single controller 203. In some embodiments, computing system 200 has multiple network interface devices or controllers 203. In some embodiments, each network interface is a connection point of a physical network link (e.g., a Cat-5 Ethernet link). In some embodiments, network interface controller 203 supports wireless network connectivity, and the interface port is a wireless (e.g., radio) receiver or transmitter (e.g., for the IEEE 802.11 protocol, Near Field Communication "NFC", Bluetooth, ANT, or any other wireless protocol). In some embodiments, network interface controller 203 implements one or more network protocols, such as Ethernet. Typically, computing device 200 exchanges data with other computing devices via a network interface through a physical or wireless link. The network interface may be directly linked to another device or linked to another device via an intermediary device (e.g., a network device that connects computing device 200 to a data network (e.g., the Internet), such as a hub, bridge, switch, or router).

[0042] The computing system 200 may include one or more input or output (“I / O”) devices, or provide interfaces for one or more input or output (“I / O”) devices. Input devices include, but are not limited to, keyboards, microphones, touchscreens, foot pedals, sensors, MIDI devices, and pointing devices such as mice or trackballs. Output devices include, but are not limited to, video displays, speakers, refreshable Braille terminals, indicator lights, MIDI devices, and 2D or 3D printers.

[0043] Other components may include I / O interfaces, external serial device ports, and any additional coprocessors. For example, computing system 200 may include interfaces (e.g., a Universal Serial Bus (USB) interface) for connecting input devices, output devices, or additional memory devices (e.g., portable flash drives or external media drives). In some embodiments, computing device 200 includes additional devices (e.g., coprocessors), such as a math coprocessor, to assist processor(s) 201 in performing high-precision or complex calculations.

[0044] Component 205 can be configured to connect to external media, display 207, input device 208, or any other component or combination thereof in computing system 200. Display 207 can be a liquid crystal display (LCD), organic light-emitting diode (OLED) display, flat panel display, solid-state display, cathode ray tube (CRT) display, projector, printer, or other known or subsequently developed display device for outputting determined information. Display 207 can serve as an interface for a user to view the functions of processor(s) 201, or more specifically, as an interface to software stored in memory 206.

[0045] Input device 208 can be configured to allow a user to interact with any of the components of computing system 200. Input device 208 can be a keypad, keyboard, cursor control device such as a mouse or joystick. Furthermore, input device 208 can be a remote control, a touchscreen display (which can be a combination of display 207 and input device 208), or any other device operable to interact with computing system 200, such as any device operable to act as an interface between the user and computing system 200.

[0046] B. Baseband interference cancellation

[0047] The technical solution disclosed herein provides improved performance for concurrent multi-band radio communication when a receiver in the first frequency band receives a signal (e.g., the signal of interest, also referred to as SOI) at a first channel in the first frequency band, while a co-located transmitter in the second frequency band concurrently transmits a signal at a second channel in the second frequency band, causing adjacent channel interference (ACI) that interferes with SOI reception. This technical solution may include a transceiver circuitry configured to include a transceiver arranged such that a separate antenna is used for both transmitting and receiving. Depending on the configuration, baseband interference cancellation may cooperate with a coexistence filter for a non-shared antenna architecture and a duplexer for a shared antenna architecture. Such embodiments of this technical solution can increase ACI and SOI isolation, which can be used to increase power and thus increase the dynamic range of the transmitted signal, reduce the cost of the coexistence filter, and allow antenna sharing.

[0048] Interference signals (e.g., ACI) at the output of a power amplifier can be down-converted to baseband (or another carrier frequency) depending on the channel through which the received signal passes (e.g., an SOI channel). After equalization, this signal can be input or fed into a demodulator to remove, attenuate, or eliminate interference appearing on the SOI baseband. Some types of coexistence filters (e.g., thin-film bulk acoustic resonators or FBARs) may suffer from thermal product mixing and their frequency response may be a function of the intermittent envelope signal power, which may include a time-dependent response. This can cause losses in conventional cancellation equalizers used to remove ACI interference in multi-band operation. The solution disclosed herein may include a dynamic model for the filter response, which can be used for accurate equalization and interference cancellation. This solution is scalable to multi-antenna applications where multiple antennas are used per frequency band. This solution can combine radio and baseband algorithms to improve dynamic range and reduce system cost. This solution can be used in multi-band access circuits or devices (e.g., chips) that integrate multiple frequency bands (e.g., 5 GHz and 6 GHz Wi-Fi bands, or any other adjacent wireless communication bands), which can be useful when the access chip roadmap is transitioning from a single-band chip to a single-chip multi-band solution. If full multi-link operation (MLO) is implemented (included in the system or physical layer of the design), then this solution can be associated with mobile chips.

[0049] Figure 3A This is an example system circuitry 300 for providing interference mitigation for a multi-band wireless communication system implemented with a dual-transceiver configuration having a dedicated transceiver antenna. Example system circuitry 300 may include a first transceiver 332 configured for wireless communication via a first frequency band (e.g., a first of 5 GHz or 6 GHz Wi-Fi bands) and a second transceiver 334 configured for wireless communication via a second frequency band (e.g., the remainder of 5 GHz or 6 GHz). The first transceiver may include a modulator 302, an up-converter 304, a power amplifier (PA) 306, a coupler 308, a bandpass filter (BPF) 310 for a dedicated (e.g., the first) wireless band, and an antenna 312 for transmitting a transmitted signal 344 in the first frequency band. The second transceiver 334 may include a demodulator 322, a down-converter 320, a low-noise amplifier 318, a second bandpass filter 316, and an antenna 314 for receiving the received signal 342 in the second frequency band.

[0050] The transmitted signal 344 of the first transceiver 332 may be offset from and adjacent to the second frequency band under which the received signal 342 is received. For example, the first of the transmitted signal 344 or the received signal 342 may be in the 5 GHz Wi-Fi band, while the remaining of the two signals (e.g., 344 or 342) may be set to be in the 6 GHz Wi-Fi band. However, the power difference between the transmitted signal 344 of the first transceiver 332 and the received signal 342 of the second transceiver 334 may be large, such that the power of the transmitted signal 344 may be approximately 100 dB greater than the power of the received signal 342. Due to this power difference between the transmitted signal 344 and the received signal 342, the tail portion of the interference from the transmitted signal 344 may overlap with the second frequency band of the received signal 342 at a sufficiently high strength level relative to the strength of the received signal 342 to interfere with the received signal 342 at the second transceiver 334.

[0051] To remove or reduce this interference from the received signal 342, the example system circuitry 300 may include an interference mitigation circuitry 340. The interference mitigation circuitry 340 may be coupled to a first transceiver 332 (e.g., via coupler 308) and a second transceiver 334 (e.g., via demodulator 322). The interference mitigation circuitry 340 is configured to mitigate interference from the transmission to reduce or eliminate its effect on the received signal 342 (including the tail portion of the transmission). The interference mitigation circuitry 340 may receive a transmitted sample 336 of the transmitted signal 344 from the coupler 308 of the first transceiver 332. The transmitted sample 336 may contain a sample of interference 338, which may include a central portion and a tail portion of the interference, the tail portion of which may extend the frequency within the frequency band of the received signal 342. The transmitted sample 336 may be input to a second BPF 324, which may filter the signal within the frequency range of the first frequency band to remove the central portion of the interference 338. The signal output from the second BPF 324 can be input to a downconverter 326 to downconvert the carrier frequency of the filtered sample signal. The downconverter 326 can remove the carrier frequency to bring the signal to baseband or transform the carrier frequency to a different carrier frequency (e.g., the carrier frequency of the second band of the received signal). The output from the downconverter 326 can be input to an equalizer 330, where the signal can be adjusted to be subtracted from the received signal 342 at the demodulator 322 of the second transceiver 334 to produce a signal from which interference has been removed or reduced in the second transceiver 334 signal. In an example where another interference from the third transceiver is also removed from the second transceiver 334 at the demodulator 322, another similarly filtered downconverted signal can also be input to another equalizer 328 to adjust the demodulator 322 to remove that second interference signal.

[0052] Example system circuitry 300 can be used for interference cancellation in the coexistence of 5 GHz or 6 GHz frequency bands involving separate antennas (e.g., 312 and 314). First and second transceivers (e.g., 332 and 334) can operate concurrently. Interference mitigation circuitry 340 can provide analog feedback for the tail end of interference (e.g., out-of-band noise or OOB edge), which may overlap with and interfere with the 5G received signal 342 (e.g., signal of interest or SOI). A 5G bandpass filter (e.g., 324) can be used to suppress the dominant 6G transmit in-band (Tx block or central portion) signal, which may be adjacent channel interference (ACI) of the 5G SOI. This BPF (e.g., 324) protects the received downconverter 326 from compression. The resulting baseband signal output from the downconverter 326 can be input to or fed to an equalizer 330 and then to a demodulator for interference reduction or cancellation.

[0053] Demodulator 322 can subtract the equalized interference signal (e.g., from the output of equalizer 330) from the primary 5 GHz received signal 342. Equalizer 330 can be trained to converge the signal to the frequency response difference between two responses. The first response can be from the output of the power amplifier and the output of the Rx 5 GHz downconverter, and the second response can be from the output of the power amplifier to the 5 GHz downconverter. In practice, this can correspond to (e.g., the same as or approximately close to) the overall cascaded response 6G (e.g., 6 GHz) and 5G (e.g., 5 GHz) coexistence filter at the SOI (e.g., received) channel. For multi-antenna applications, N antennas can cause interference, and the problem becomes a multiple-input signal-to-output (MISO) N:1, where each receive path can be used to cancel N interferences. Assuming that a similar sampling path (e.g., interference mitigation circuitry 340) is available for each interference path, then the sampling path can be shared across all receive paths. In such examples, additional equalizers (e.g., 330, 328) can be used for interference compensation, such that each demodulator (e.g., 322) can have N associated individual equalizers, where each equalizer can represent a Tx and Rx coexistence filter pair. In instances involving T1…T4 being Tx coexistence filters with four antennas and R1…R4 corresponding to the four Rx values ​​as coexistence filters, there can be 16 pairs: T1R1, T1R2…T4R4. Receiver n can host four equalizers to compensate for T1Rn, T2Rn, T3Rn, and T4Rn.

[0054] The first transceiver 332 (also referred to as a transmitting transceiver) may comprise any type of wireless communication transceiver designed to transmit signals across a specified frequency band. The first transceiver 332 may be configured to include various components configured (e.g., arranged and interconnected) to modulate, amplify, and transmit signals. For example, the first transceiver 332 may be configured to operate in a 5 GHz or 6 GHz Wi-Fi band, thereby allowing it to handle multiple communication protocols. The first transceiver 332 may include a modulator 302 for encoding data into a carrier signal, an up-conversion converter 304 for adjusting the signal frequency for transmission, and a power amplifier 306 for amplifying the signal strength before transmission via an antenna. The first transceiver 332 may include a coupler 308 to receive signals from the power amplifier 306 and provide the output to a first band BPF 310 for filtering before transmission via antenna 312, and to provide samples of the transmitted signal (e.g., transmitted sample 336) for processing by interference mitigation circuitry 340.

[0055] Modulator 302 may include any type of circuitry that converts a baseband signal into a modulated radio frequency signal suitable for transmission. Modulator 302 may be or include a baseband modulator that converts the baseband signal into a higher frequency signal. Modulator 302 may be configured to encode data or information onto a carrier wave, thereby allowing effective signal transmission over a wireless channel. For example, modulator 302 may utilize techniques such as amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM) to prepare the data signal for further processing (e.g., upsampling and amplification). Modulator 302 may adjust the characteristics of the carrier wave according to the input data. This facilitates demodulation of the transmitted signal by the transceiver at the receiving device (e.g., across a Wi-Fi link).

[0056] Upconverter 304 may include any circuitry that converts the frequency of a baseband signal to a higher frequency suitable for transmission. Upconverter 304 can prepare the output signal from modulator 302 for effective transmission within a wireless communication band. For example, upconverter 304 may take a modulated signal from modulator 302 and convert that signal from a lower frequency range to a frequency range falling within the intended operating band (e.g., the first band of the transmit signal 344, such as 5 GHz or 6 GHz). Upconverter 304 may mix the baseband signal with a local oscillator signal to produce an output at a higher frequency, which may be amplified, filtered, and then transmitted via antenna 312.

[0057] Power amplifier (PA) 306 may include any circuitry or means configured to increase the power level of a radio frequency signal (e.g., the signal output from upconverter 304). PA 306 can increase the power of the signal to provide it with sufficient strength to reach its intended destination when transmitted via antenna 312 without significant attenuation at the receiving device. For example, PA 306 can amplify the output from upconverter 304, thereby enhancing the power of this signal to meet a predetermined set power level (e.g., regulatory requirements) or to overcome losses in the transmission medium. Depending on the design, PA 306 may utilize various amplification techniques (e.g., linear or nonlinear amplification) to provide performance across different operating conditions.

[0058] Coupler 308 may include any circuitry or means configured to split or combine signals within the transmit path without significantly affecting their power levels. Coupler 308 may be circuitry configured to generate or split transmit sample 336 signals based on transmit signal 344 output from power amplifier, the power of which may be 20 or 30 dB lower than the power of transmit signal 344. Coupler 308 may be configured to split transmit sample 336 without affecting the signal integrity of transmit signal 344. For example, coupler 308 may take an amplified transmit signal from PA 306 and provide samples to interference mitigation circuitry while allowing the main signal to advance to bandpass filter BPF 310 and be transmitted from bandpass filter BPF 310 via antenna 312. Although the coupler 308 in example system 100 is described as being located between PA 306 and the first frequency band BPF 310, depending on the design, the coupler 308 may be located at any other location on the first transceiver 332, such as after the first frequency band BPF 310 and before the antenna 312, before PA 306, or at any other location.

[0059] The first frequency band BPF 310 may include any filter designed to allow signals within a certain frequency range to pass through while attenuating signals outside that range. The first frequency band BPF 310 may include a bandpass filter or a combination of a low-pass filter and a high-pass filter, which can be configured to a specific frequency band range (e.g., the first frequency band of the transmitted signal), thereby removing all other signals outside the specified frequency band. For example, the first frequency band BPF 310 may be configured to pass frequencies within the specified frequency band (e.g., 5 GHz when the first frequency band is a 5 GHz Wi-Fi band) while suppressing out-of-band interference that may degrade performance. This can improve signal integrity before transmitting the transmitted signal 344 from the first transceiver 332 via antenna 312.

[0060] Antenna 312 may comprise any structure or component designed to radiate (e.g., transmit) or receive electromagnetic waves in a wireless communication system. Antenna 312 may serve as an interface between free space (e.g., air) and the electronic components of the first transceiver 332. For example, antenna 312 may be designed to operate in one or more frequency bands, such as 5 GHz or 6 GHz bands. Antenna 312 may be configured to optimize its radiation pattern and gain characteristics for specific frequency ranges or bands.

[0061] The second transceiver 334 (also referred to as a receiver transceiver) may comprise any type of wireless communication transceiver designed to receive signals across a specified frequency band. For example, the second transceiver 334 may be a transceiver configured to receive signals in a second frequency band adjacent to a first frequency band in which the first transceiver 332 can simultaneously or concurrently transmit transmit signals 344. The second transceiver 334 may comprise various sub-components that work together to demodulate and process the incoming signals for further use. For example, the second transceiver 334 may operate in conjunction with the first transceiver 332 by receiving signals in an adjacent frequency band (e.g., at 5 GHz when the first transceiver operates at 6 GHz) or by operating at 6 GHz when the first transceiver operates at 5 GHz. Depending on the configuration, the second transceiver 334 may include any functionality of the first transceiver 332, and vice versa.

[0062] Antenna 314 may comprise any structure designed to radiate or receive electromagnetic waves in a wireless communication system. Antenna 314 may be configured to operate as an interface between an incoming radio signal and electronic components within the second transceiver 334. For example, antenna 314 may be optimized for operation at frequencies near a second frequency band (e.g., 5 GHz or 6 GHz, depending on the frequency band under which the first antenna 312 operates). Antenna 314 may be configured (e.g., shaped) to capture the incoming signal while minimizing losses due to reflection or absorption. Depending on the configuration, antenna 314 may include any functionality of antenna 312, and vice versa.

[0063] The second-band BPF 316 may include any filter (e.g., a bandpass filter) configured to isolate only those frequencies associated with its operating band while suppressing signal components outside that range. The second-band BPF 316 may be configured to operate in a second band (e.g., a different band than the first band under which the first-band BPF 310 filters). The second-band BPF 316 may be configured as a bandpass filter that only allows desired incoming signals to travel for processing by the second transceiver 334 and filters signals outside of it. For example, BPF 316 may be configured to allow frequencies near the second band (e.g., approximately 5 GHz) while attenuating out-of-band noise that may interfere with reception quality. Depending on the configuration, the second-band BPF 316 may include any functionality of the first-band BPF 310, and vice versa.

[0064] The low-noise amplifier (LNA) 318 may include any circuitry or means configured to amplify weak incoming radio frequency signals while limiting the amount of additional noise introduced into the system. The LNA 318 may be configured to enhance the strength of the received signal 342 before further processing by the downconverter 320 and demodulator 322 of the second transceiver 334. For example, the LNA 318 may amplify the signal captured by the antenna 314 after passing through the second frequency band BPF 316, thereby ensuring that even weak signals are sufficiently amplified for demodulation by subsequent components. Depending on the configuration, the LNA 318 may include any functionality of the PA 306, and vice versa.

[0065] Downconverter 320 may include any circuitry that converts a high-frequency received signal into a low-frequency baseband signal suitable for processing by a digital system. Downconverter 320 may prepare an amplified incoming signal from LNA 318 for demodulation within a second transceiver 334. For example, downconverter 320 may acquire amplified RF signals and mix them with a local oscillator frequency to produce an intermediate frequency (IF) or baseband output, which may be more conveniently processed or configured for demodulator 322. Depending on the configuration, downconverter 320 may include any functionality of downconverter 326, and vice versa.

[0066] Demodulator 322 may include any circuitry or means responsible for extracting raw information from the modulated carrier received by second transceiver 334. Demodulator 322 components may be configured to convert the processed RF signal back to a usable baseband data format after down-conversion via down-converter 320. For example, demodulator 322 may obtain the output from down-converter 320 and decode the output according to a modulation scheme (e.g., QAM or PSK) used during transmission. Demodulator 322 may utilize the output from equalizer 330 or 328 to adjust the received signal 342 according to the signal output from equalizer 330 or 328 to produce an output received signal without any interference 338.

[0067] Interference mitigation circuitry 340 may include any circuitry or means configured to reduce or eliminate interference from transmitted signal 334 that affects received signal 342 within a wireless communication device. Interference mitigation circuitry 340 can facilitate improved overall system performance by removing interfering signals and improving signal coexistence. For example, interference mitigation circuitry 340 may utilize techniques such as adaptive filtering or cancellation algorithms based on samples obtained from the transmission path. These samples may be filtered and down-converted and used as input to an equalizer, which may be adaptively tuned to produce a signal that can be subtracted from or combined with the signal from demodulator 322 or signals within demodulator 322 to produce a received signal that removes or attenuates interference from the transceiver.

[0068] Transmitted sample 336 may contain any sample, copy, or representation of a portion of the transmitted RF signal (e.g., transmitted signal 344) that can be used for monitoring or processing within the interference mitigation circuitry system 340. This sample serves as a reference point against which the incoming received signal is compared to accurately identify interference characteristics. For example, transmitted sample 336 may capture both the central and tail portions of the transmitted signal as it propagates through space before reaching the receiving antenna (e.g., antenna 314).

[0069] Interference 338 may include any unwanted or undesirable signal or noise that may overlap with, interfere with, or degrade the received signal 342. Interference 338 may form or occur when a strong transmitted signal 344 overlaps with a weaker received signal 342. Interference 338 may form or occur at least in part due to proximity in the frequency band or spatial positioning of the antenna involved in the transmission or reception process. For example, interference 338 may manifest as a tail portion of a weaker incoming data stream extending from a high-power transmitted signal 344 at a second transceiver 334. It should be understood that features or characteristics associated with this interference (e.g., via equalizer 330) may allow for interference mitigation.

[0070] The second band BPF 324 may include any filter (e.g., a bandpass filter) configured to isolate desired frequencies near the secondary operating band during processing phases within the interference mitigation circuitry 340, while suppressing other frequencies outside this frequency range. The second band BPF 324 may facilitate the efficient use of relevant portions of the sampled transmitted data when mitigating interference effects on the received communication stream at demodulator 322. For example, the second band BPF 324 may filter out unwanted or irrelevant noise signals present alongside the transmitted sample 336 via coupler 308. Depending on the configuration, the second band BPF 324 may include any functionality of the first band BPF 310 or the second band BPF 316, and vice versa.

[0071] Downconverter 326 may include any circuitry configured to convert sampled RF transmissions at higher frequencies into a lower frequency format suitable for subsequent processing stages within interference mitigation circuitry system 340. Downconverter 326 can serve as an intermediate step between the filtered transmit sample 336 obtained from the second-band BPF 324 and the final adjustment performed at demodulator 322 before subtracting the input received signal 342 from the output signal. For example, downconverter 326 may mix the filtered transmit sample 336 with a local oscillator frequency to produce an intermediate output that contributes to accurate equalization efforts at equalizer 330.

[0072] The equalizer 330 may include any means responsible for adjusting the amplitude and phase characteristics associated with the sampled transmission before subtracting the incoming received data stream during the demodulation process occurring at the second transceiver 334. This component plays an indispensable role in improving overall reception quality by compensating for distortion introduced by RF communications along various channels before reaching their final destination—such as antennas involved in the early stages, like those found in the first transceiver configuration discussed earlier herein—enhancing clarity throughout the system involved. For example, the equalizer 330 may utilize adaptive algorithms based on real-time analysis of the filtered output generated earlier via the downconverter 326 to ensure optimal performance remains consistent even under challenging environmental factors affecting wireless networks. For example, the equalizer 330 may utilize linear and nonlinear functions or models to overcome nonlinearities present in the BPF and any other relevant components in the Tx, Rx, or sampling path.

[0073] The equalizer 330 may include any circuitry or means configured to adjust the amplitude and phase characteristics of the sampled transmit signal before subtracting the sampled transmit signal from the incoming received signal 342 at the demodulator 322. The equalizer 330 can improve reception quality by compensating for distortion introduced during signal transmission. The equalizer may include a processor or digital processing circuitry system containing input parameters that can be used (e.g., manipulated or controlled) to adjust the output signal of the downconverter 326 to match interference from the transmitted sample. This can produce an output signal that can then be used at the demodulator 322 to subtract or remove interference (e.g., tailing interference) from the baseband version of the received signal.

[0074] Equalizer 330 may utilize an adaptive algorithm based on real-time analysis of the filtered output from downconverter 326. Equalizer 328 may include functionally similar but specifically tailored circuitry to address additional interference signals encountered during the reception phase, which occurs at demodulator 322. Equalizer 328 may operate in conjunction with equalizer 330 to primarily focus on improving adjustments against secondary sources causing unwanted interference (e.g., any other transceivers). For example, equalizer 328 may utilize different adaptive algorithms designed to identify specific characteristics associated with specific types of interference frequently encountered across a wide variety of applications. Equalizers 330 or 328 may adaptively (e.g., based on feedback signals) adjust their parameters to mitigate or fine-tune the effects of interference and enhance overall communication clarity within the wireless system.

[0075] Training and tracking of equalizers (e.g., 330, 328) can be used to improve the performance of the system in a dynamic implementation. Training can be performed using a least-squares (LS) solver, where the received signal 342 (e.g., the signal of interest or SOI) may not be present at the receiver input during training. However, if the SOI is present, equalizer 330 can be treated as additive noise, potentially increasing the number of training samples required to suppress SOI noise for accurate equalizer calibration. The interfering channel can be substantially static, allowing for long-term tracking based on a novel LS process or an instantaneous least mean square (LMS) method. This capability helps ensure the effectiveness of equalizer 330 even under changing conditions.

[0076] An equalizer (e.g., 330, 328) compensates for variations in the receiver's automatic gain control (AGC). The receiver path may include AGC to manage the dynamic range of the Received Signal Strength Index (RSSI). If equalizer training occurs at a specific receiver gain G0 and that gain changes to G1 during SOI reception, the equalizer gain can be adjusted according to the gain factor G1 / G0. This adjustment supports maintaining optimal performance, allowing the equalizer to effectively compensate for any variations in signal strength throughout reception. The equalizer may include parameters controlling frequency, phase, amplitude, signal strength, or any other parameters, and these parameters can be adjusted to control such output adjustment.

[0077] Figure 3B An example graph 350 illustrates an interference signal having a central portion 356 and a tail portion 358 of the interference plotted within a certain frequency range. The interference may include any interruption or alteration of the signal (e.g., the received signal 342) caused by the presence of an unwanted transmitted signal 344 (e.g., noise), potentially leading to distortion in the communication system. The example graph 350 may include an X-axis corresponding to the signal frequency and a Y-axis corresponding to the signal strength (e.g., dB). A first frequency band 352 may correspond to the frequency band of the received signal 342 (e.g., a channel). A second frequency band 354 may correspond to the frequency band of the transmitted signal 344 (e.g., a channel) or its central portion 356.

[0078] The curve 350 may correspond to interference 338 that reflects the transmitted signal 344, which may interfere with the received signal 342. Interference 338 may include a central portion 356 of the interference having a peak signal strength. Interference 338 may include a tail portion 358, which may include a portion of the interference before or after the central portion 356 and may be characterized by a gradual decrease in amplitude or intensity, although it still causes interference or distortion. For example, the tail portion 358 may include portions that extend away from the central portion 356 toward, into, or through the first frequency band 352 of the received signal, thereby affecting the quality of the received signal and the gradually decreasing signal strength. Although filters may be used (e.g., in interference mitigation circuitry 340) to remove or filter out the central portion 356 of the signal, such as BPF 324, 316, or some other filters, the tail portion 358 may be retained and still affect the first (e.g., received) signal 342.

[0079] The tail portion 358 of the interference (also referred to as the out-of-band (OOB) portion) may remain in the signal after the transmitted sample signal has been filtered. This tail portion 358 (e.g., the OOB portion of the signal interference) can be removed using, for example, a filtered down-converted (e.g., down-converted by 326) signal fed into equalizer 330. Equalizer 330 can use this input signal, along with feedback from the receiver, to fine-tune or adjust the parameters controlling its equalizer output. Based on the feedback signal, equalizer 330 can adjust the equalizer output signal to combine with the received signal 342 at demodulator 322 such that it matches the interference, thereby allowing demodulator 322 to remove or reduce the tail portion 358 (e.g., the OOB portion) of the interference 338 from the received signal 342.

[0080] Figure 4 This describes an example system circuitry 400 for providing interference mitigation for a multi-band wireless communication system implemented in a configuration with a shared multi-band antenna. As in example system circuitry 300, example system 400 may include various components of a first transceiver 332 and a second transceiver 334 coupled to interference mitigation circuitry 340. However, unlike example system circuitry 300, example system 400 is configured to couple the first transceiver 332 and the second transceiver 334, coupled via duplexer 402, for communication via a single shared antenna 312.

[0081] The first transceiver 332 may include a modulator 302, an up-converter 304, a power amplifier 306, and a coupler 308. The modulator 302 modulates the signal and generates an output, which can be input to the up-converter 304 to establish the carrier frequency of the frequency band or channel of the first transceiver 332. The output from the up-converter 304 can be input to the power amplifier 306 to amplify the signal, which can then be coupled to the coupler 308. The coupler 308 of the first transceiver 332 provides two outputs: a first output to a duplexer 402 for transmitting a signal via antenna 312, and a second output (e.g., transmitting sample 336 signal) to the BPF 324 of the interference mitigation circuitry 340.

[0082] The second transceiver 334 may include an LNA 318 that receives its incoming received signal from the duplexer 402 and thus receives the received signal from the shared antenna 312. The LNA 318 may amplify the received signal 342 and provide an output (e.g., an amplified received signal), which may be input to an inter-system frequency (ISF) bandpass filter (BPF) 404 of the second transceiver 334. The output of the ISF BPF 404 may be input to a downconverter 320, the output of which may be provided to both the demodulator 322 of the second transceiver 334 and the equalizer 330 of the interference mitigation circuitry 340 to adjust or tune the equalizer 330 to provide an output for removing tail-end (e.g., out-of-band) interference from the received signal 342.

[0083] Interference mitigation circuitry 340 may include a BPF 324 capable of receiving transmitted samples 336 from coupler 308. BPF 324 filters out all signals outside a predetermined signal range. The output of BPF 324 may be input to a downconverter 326 to provide a filtered and downconverted (e.g., baseband or set to a different carrier frequency) signal. For example, this baseband downconverted signal may be input to an equalizer 330. Equalizer 330 may receive the downconverted output from downconverter 320 of the second transceiver 334 to provide or generate an output signal based on which interference signals can be removed from the received signal (e.g., SOI) at demodulator 322.

[0084] Antenna 312 may include from Figure 3A The example system circuitry 300 may include any functionality of antenna 312 or 314. Antenna 312 may be configured to support both transmission and reception of signals from the first transceiver 332 and the second transceiver 334. Antenna 312 may include one or more individual antennas that can be coupled to the first and second transceivers (e.g., 332 and 334) via one or more duplexers 402.

[0085] Duplexer 402 may include any circuitry or electronic device configured to provide bidirectional communication on a single path, thereby allowing simultaneous transmission and reception of signals via antenna 312. Duplexer 402 provides isolation between the receiver and transmitter while allowing two transceivers to share a common antenna. Duplexer 402 can separate transmitted and received signals based on the direction of transmission and reception, thereby managing frequency bands to prevent interference. In frequency division duplex (FDD) systems, the duplexer can use filters to ensure that the transmitter's output does not overwhelm the receiver's input, thus maintaining signal integrity.

[0086] The Inter-System Filter Bandpass Filter (ISF BPF) 404 may contain any circuitry, component, or electronic device for allowing a specific frequency range to pass while simultaneously attenuating frequencies outside that range. This ISF BPF 404 can be used in a multi-band configuration of System 400 to facilitate interference management, preventing unwanted overlap of signals from various sources. By selectively filtering out unwanted frequencies, the ISF BPF 404 improves signal integrity and clarity, making it particularly valuable in environments where multiple communication protocols operate simultaneously.

[0087] Figure 5 This describes an example system circuitry 500 for providing interference mitigation in a multi-band wireless communication system implemented with a power amplifier model. The example system circuitry 500 may include a first transceiver 332, which includes a modulator 302, an up-conversion converter 304, a power amplifier (PA) 306, a coupler 308, and a power amplifier filter (BPF) 310 coupled to an antenna 312, as described in conjunction with... Figure 3A The example system circuit system 300 is described in the example system. Similarly, as... Figure 3A As described herein, the example system circuit system 500 may include a second transceiver 334, which has an antenna 314, a BPF 316, an LNA 318, a downconverter 320, and a demodulator 322.

[0088] Example system circuitry 500 may include interference mitigation circuitry 340, which includes a power amplifier (PA) model 502. PA model 502 can receive an input signal from the modulator 302 of the first transceiver 332 and model that signal to estimate, generate, or determine an output signal to be provided to the equalizer 330, which can then use the output signal to provide a signal to be used at the second transceiver 334 to remove interference from the received signal.

[0089] The power amplifier (PA) model 502 may include any circuitry or means configured to estimate or accurately represent the behavior of the upconverter 304 and power amplifier 306 relative to interference signals generated by the first transceiver 332. The PA model 502 may include any means or circuitry (e.g., processor circuitry or processing device) that provides or determines the nonlinear characteristics and dynamic response of the PA, which can be used to predict how the first transceiver 332 and its components (e.g., upconverter 304, PA 306, coupler 308, or BPF 310) may perform under various input conditions. The PA model 502 may include functionality for generating an out-of-band (OOB) or tail-end signal corresponding to interference from the output of the modulator 302 at a baseband or given carrier frequency. This signal may be input to an equalizer 330 to generate a signal for removing tail-end (e.g., OOB) interference from the received signal at the demodulator of a second (e.g., receiving) transceiver 334.

[0090] In some systems, digital predistortion (DPD) can be used to mitigate PA distortion. PA model 502 may include, for example, features of digital predistortion (DPD) or a combination of PA 306 and DPD responses to counteract distortion effects occurring at high power levels. For example, in a multi-band system configuration, PA model 502 may receive an input signal from a modulator and estimate an output signal, which can then be used by an equalizer for interference reduction. PA model 502 can operate by analyzing the input-output relationship via techniques such as least squares (LS) fitting, thereby enabling it to adapt to changes in operating conditions and optimize performance.

[0091] PA model 502 can be configured to receive input from modulator 302 or any other part of the transceiver and generate an estimated output signal fed into equalizer 330. This process can aid in baseband interference mitigation by providing a reference for removing unwanted signals from the received data. PA model 502 can operate when integrated with a coexistence filter, allowing the system to manage multiple frequency bands without performance degradation. By employing techniques such as least squares (LS) training and tracking, PA model 502 can adapt to changes in operating conditions, thereby enhancing its accuracy and reliability.

[0092] The transmit OOB (e.g., transmit tailing interference) generated by PA model 502 may include or be based on additive white Gaussian noise (AWGN) and nonlinear products of the transmitted signal. At high transmit power levels, tailing interference signals (e.g., OOB edges) may be dominated by nonlinear products of the transmit signal. PA model 502 includes a nonlinear model that can be configured to operate with or without DPD (digital predistortion), and it can be applied to digital transmit (Tx) baseband signals to estimate Tx OOB edges (e.g., tailing interference) for cancellation, thereby replacing analog downconversion paths (e.g., BGP 5G and Rx downconverters in interference mitigation circuitry system 340).

[0093] Equalizer 330 can be configured to include, undergo, or provide equalizer training and tracking. Training of equalizer 330 can be performed using, for example, a least squares (LS) solver. The LS solver can include computational tools or algorithms that can be implemented in a processor to solve a linear least squares problem, the solution of which may involve finding the best-fit solution to a system of linear equations by minimizing the sum of squares of the residuals between observed and predicted values. For example, the best-performing received signal 342 (e.g., SOI) may not be present at the receiver input during training. For example, training can be completed even if the SOI is present. The SOI can be considered additive noise for training, thus increasing the number of training samples to suppress SOI noise and obtain appropriate equalizer accuracy. The interfering channel can be static and tracking can be long-term. Tracking can be based on a new LS process or use instantaneous LMS.

[0094] The receiver path (e.g., the second transceiver 334) may include automatic gain control (AGC), which can be used to compensate for the dynamic range of the Received Signal Strength Index (RSSI). Assuming that equalizer 330 or 328 is trained at a specific receiver (Rx) gain G0, and assuming that after training, the Rx gain becomes gain G1 during SOI reception, the equalizer gain can be tuned according to the gain factor G1 / G0.

[0095] The filters used may be nonlinear or exhibit nonlinear properties. For example, regarding thermal mixing products, due to the output of PA306, emitter (Tx) coexistence filters may introduce nonlinearity, such as thermal mixing products that may exist in FBAR filters. This may cause the filter to change its frequency response according to the power envelope of the intermittent signal.

[0096] The following expression can be used to describe or model this frequency:

[0097] .

[0098] In the above expression, This can represent the nominal linear FBAR response at low power. It can represent the frequency shift caused by thermal mixing products. The signal can be the driving filter and the LPF can be a low-pass filter (e.g., the cutoff frequency is about 10 MHz).

[0099] Low to medium ACI power Subsequent training can be performed as a linear response. Regarding model parameters (e.g., K and LPF), their cutoff frequencies can be trained up to the maximum ACI power.

[0100] Regarding impedance mismatch, the PA impedance can depend on both the average and intermittent envelope power. A Tx coexistence filter (e.g., BPF310) can be connected to the PA up to a low insertion loss (IL) coupler, and the response can be time-dependent, with a linear time-invariant (LTI) equalizer exhibiting the loss. This non-LTI response can be modeled and trained to achieve accurate elimination.

[0101] For reference Figure 6A and 6B Example systems 600 and 650 for multi-band integrated circuit configurations utilize the access point core and front-end module of a wireless communication device to provide baseband interference mitigation. In example system configurations 600 and 650, to save implementation costs, the configuration can utilize existing idle downconversion paths of multi-band chips or integrated circuits to implement this technical solution. For example, in Wi-Fi technology, the receive signal (Rx) path can be idle during the transmit (Tx) time, and since Rx resources are idle during transmit, Rx resources can be used for the return path in a configuration involving analog return paths of an analog BFP, downconverter, equalizer, and demodulator forming interference mitigation circuitry system 340. This approach utilizes routing within the integrated circuit (e.g., a chip) rather than using additional semiconductor circuitry blocks to implement the return path.

[0102] Baseband cancellation in a dual-band chip of a shared antenna embodiment can occur when one of the frequency bands (e.g., 5G or 6G) is used for transmission, while the remainder of both bands (e.g., the remainder of 6G or 5G) is used for concurrent signal reception. Therefore, Figure 6A and 6B The instance configuration in the example can correspond to either transmitting under 5G and receiving under 6G, or transmitting under 6G and receiving under 5G.

[0103] Figure 6AThis describes an example of a system 600 configured with a multi-band integrated circuit for providing baseband interference mitigation. Example system 600 may include a first access point core or chip 602 that can be paired with a first front-end module (FEM) 604 for a first channel or frequency band. Example system 600 may also include a second access point core or chip 608 that can be paired with a second FEM 606 for a second channel or frequency band. Each of access point cores 602 or 608 may include its own modulator 302, up-converter 304, and internal driver 610 on the transmitter side, and an internal LNA 318, down-converter 320, equalizer 330, and demodulator 320 on the receiver side. Each of FEMs 604 or 606 may include its own external PA 306 and coupler 308 on the transmitter side, and an external LNA 318 and BPF 316 on the receiver side. Coupler 308 and LNA 318 can be coupled to Tx-Rx switch 614, which leads to external duplexer 402 to use one or more antennas 312 to transmit multi-band signals.

[0104] Regarding access point core 602 and its FEM 604, as well as access point core 608 and FEM 606, the transmit path may begin with modulator 302 for baseband transmission, followed by upconverter 304 and internal driver 610, which may include any functionality of power amplifier 306. The signal may proceed from the internal driver 610 at the access point core to the external power amplifier 306 of the FEM. The signal may proceed from PA 306 toward coupler 308, from which it may be input to Tx-Rx switch 614, which may be configured to switch between transmit and receive paths depending on outgoing or incoming traffic. Coupler 308 may also provide sample signals to BPF 324, which may include any functionality of BPF 316.

[0105] The receive path of the access point core and FEM can begin from an external LNA 318 coupled to the BPF 316 of the FEM. The output signal from the BPF 316 can enter the internal LNA 318 of the access point core, and the output signal can be moved from the internal LNA 318 to a downconverter 320 and demodulator 322, which can be modulated or adjusted by the equalizer 330 of the access point core. The duplexer 402, which receives signals from and provides signals to the Rx-Tx switches 614 of the FEMs 604 and 606, can include internal BPFs 620 and 622, which can be configured to bandpass filter the corresponding frequency band or channel of the transceiver chain. The output of the duplexer 402 can be coupled to one or more antennas 312 for transmitting and receiving signals. Access point cores 602 and 608 can each couple their up-converter 304 and down-converter 320 to a phase-locked loop (PLL) 616, which provides a clock for each of the frequency bands (e.g., 5 GHz and 6 GHz).

[0106] At a higher level, instance system 600 may correspond to a system-on-chip (SoC), which may correspond to 5 GHz and 6 GHz access point cores 602 and 608, respectively, connected to their appropriate corresponding FEMs 604 and 606. In a shared antenna embodiment, FEMs 604 and 606 may be connected to duplexer 402. The configuration may utilize Tx and Rx paths and utilize idle circuitry of the paths to implement the functionality of interference mitigation circuitry system 340. Using PLL 616 and internal clock circuitry, Tx and Rx paths may be configured individually according to either the frequency band or channel (e.g., 5 GHz or 6 GHz), and the internal clock circuitry may be reset or configured for either the transceiver Tx or Rx path. Although the examples presented herein discuss this solution in the context of instance frequency bands or channels of 5 GHz or 6 GHz, it should be understood that any other frequency band, channel, or frequency range may be used to implement this technical solution. It should also be understood that more technical solutions can be implemented with respect to more than two frequency bands or channels, including, for example, three, four, five, six or more six frequency bands or channels, any of which may include their respective interference mitigation circuitry 340 to remove multiple interferences 338 from the received signal 342 in any frequency band or channel.

[0107] The transmit (Tx) signal path in Example System 600 can be illustrated using wide gray arrows, corresponding to transmit (Tx) signal paths in the 6 GHz band or channel. In Example System 600, as shown by the wide gray arrows, the Tx path begins at modulator 302 of access point core 608, where the Tx baseband signal can be modulated. From modulator 302 of access point core 608, the signal can be up-converted via up-converter 304 of the same access point core, and then processed by internal driver 610. The output of internal driver 610 can be fed to PA 306 of FEM 606. The signal can be coupled from PA 306 to coupler 308 of FEM 606 and then to Tx-Rx switch 614 and duplexer 402 for transmission via one or more antennas 312.

[0108] The signal reception path (Rx) of system 600 can be indicated by a wide white arrow, starting from duplexer 402 and entering Tx-Rx switch 614 of FEM 604. The output of Tx-Rx switch 614 can be input to LNA 318 and BPF 316 of FEM 604. The signal can be input from BPF 316 of FEM 604 to internal LNA 318 of access point core 602, and the signal can move from internal LNA 318 to downconverter 320 and demodulator 322 of access point core 602, where the Rx signal can be demodulated. The output from demodulator 322 can be fed back to equalizer 330 of access point core 602 to continuously adjust (e.g., train or fine-tune) equalizer 330.

[0109] The functional analog feedback of the interference mitigation circuitry 340 can be illustrated using a wide dashed arrow (with a slanted dashed line). The processing path of the interference mitigation circuitry 340 can begin by providing the transmitted sample signal 336 to the BPF 324 of the FEM 606 from the output of the coupler 308. The output of the BPF 324 can be (e.g., via a switching circuit) provided to the internal LNA 318 of the access point core 608. From the internal LNA 318, the output can be processed by the downconverter 320 of the access point core 608. From the downconverter 320, the output can be transmitted to the equalizer 330 of the access point core 602. In this way, the system 600 can utilize the idle internal LNA 318 and the idle downconverter 320 at the access point core 608. The equalizer 330 of the access point core 602 can provide its output to the demodulator 322 of the same core, thereby facilitating demodulation of the received signal to remove interference and improve the quality of the received signal. In this way, the technical solution utilizes the existing circuitry of the two access point cores and two FEMs, along with additional connections, to implement interference cancellation using the idle circuitry.

[0110] Figure 6B This describes another example of a system 650 configured with a multi-band integrated circuit for providing baseband interference mitigation. Example system 650 can be used with... Figure 6A The system is the same as or similar to 600, and may include arrangements that are combined with Figure 6A The system 650 may include the same or similar components as described in System 600. System 650 may include a transmit path in Access Point Core 602, which may begin with a modulator 302 for baseband transmission, followed by an up-conversion converter 304 and an internal driver 610, which may include any functionality of a power amplifier 306. Signals may proceed from the internal driver 610 at Access Point Core 602 to the external power amplifier 306 of FEM 604. Signals may proceed from PA 306 toward coupler 308, from which they may be input to a Tx-Rx switch 614, which may be configured to switch between transmit and receive paths depending on outgoing or incoming traffic. Coupler 308 may also provide sample signals to BPF 324, which may include any functionality of BPF 316. The same configuration from Access Point Core 602 and FEM 604 can exist in Access Point Core 608 and FEM 606.

[0111] The receive path of the access point core and FEM can begin from an external LNA 318 coupled to the BPF 316 of the FEM. The output signal from the BPF 316 can enter the internal LNA 318 of the access point core, and the output signal can be moved from the internal LNA 318 to a downconverter 320 and demodulator 322, which can be modulated or adjusted by the equalizer 330 of the access point core. The duplexer 402, which receives signals from and provides signals to the Rx-Tx switches 614 of the FEMs 604 and 606, can include internal BPFs 620 and 622, which can be configured to bandpass filter the corresponding frequency band or channel of the transceiver chain. The output of the duplexer 402 can be coupled to one or more antennas 312 for transmitting and receiving signals. Access point cores 602 and 608 can each couple their up-converter 304 and down-converter 320 to a phase-locked loop (PLL) 616, which provides a clock for each of the frequency bands (e.g., 5 GHz and 6 GHz).

[0112] In example system 650, the transmit (Tx) signal path can be illustrated using wide gray arrows, corresponding to the transmit (Tx) signal path in the 5 GHz band or channel. As shown by the wide gray arrows, the Tx path may begin at modulator 302 of access point core 602, where the Tx baseband signal can be modulated. From modulator 302 of access point core 602, the signal may be up-converted via up-converter 304 of the same access point core, and then processed by internal driver 610, the output of which may be fed to PA 306 of FEM 604. The signal may be coupled from PA 306 to coupler 308 of FEM 604 and then to Tx-Rx switch 614 and duplexer 402 for transmission via one or more antennas 312.

[0113] The signal reception path (Rx) of system 650 can be indicated by a wide white arrow, starting from duplexer 402 and entering Tx-Rx switch 644 of FEM 606. The output of Tx-Rx switch 644 can be input to LNA 318 and BPF 316 of FEM 606. The signal can be input from BPF 316 of FEM 606 to internal LNA 318 of access point core 608, and from internal LNA 318, the signal can move to downconverter 320 and demodulator 322 of access point core 608, where the Rx signal can be demodulated. The output from demodulator 322 can be fed back to equalizer 330 of access point core 608 to continuously adjust (e.g., train or fine-tune) equalizer 330.

[0114] The functional analog feedback of the interference mitigation circuitry 340 can be illustrated using a wide dashed arrow (with a slanted dashed line). The processing path of the interference mitigation circuitry 340 can begin by providing the transmit sample signal 336 from the output of the coupler 308 of the FEM 604 to the BPF 324 of the FEM 604. The output of the BPF 324 can be (e.g., via a switching circuit) provided to the internal LNA 318 of the access point core 602. From the internal LNA 318, the output can be processed by the downconverter 320 of the access point core 602. From the downconverter 320, the output can be transmitted to the equalizer 330 of the access point core 608 (e.g., on a pair of opposing access point cores and FEMs). In this way, the system 650 can utilize the idle internal LNA 318 and idle downconverter 320 at the access point core 602 that are not used during Tx. The equalizer 330 of the access point core 608 can provide its output to the demodulator 322 of the same core, thereby facilitating the demodulation of the received signal to remove interference and improve the quality of the received signal. In this way, the technical solution utilizes the existing circuitry of the two access point cores and two FEMs, along with additional connections, to implement interference cancellation using idle circuitry.

[0115] Figure 7 A flowchart illustrating method 700 for providing interference mitigation in a multi-band wireless communication system. Method 700 may include methods that can be combined with... Figures 1 to 6B The described and discussed example systems, components, and features perform actions 705 to 730. At 705, the device may receive a first signal via a first frequency band for wireless communication. At 710, the device may transmit a second signal via a second frequency band for wireless communication. At 715, the device may filter out the central portion of interference from samples of the second signal. At 720, the device may adjust the carrier frequency of the filtered sample signal. At 725, the device may identify the tail portion of interference from the adjusted and filtered sample signal to generate a third signal. At 730, the device may use the third signal to reduce interference caused by the second signal from the first signal.

[0116] At point 705, the device may receive a first signal via a first frequency band for wireless communication. The method may include a circuitry, such as a system circuitry comprising multiple wireless transceivers for transmitting and receiving wireless signals. At least one of the system circuitry or the transceivers of the circuitry may receive the first signal via the first frequency band of the multiple frequency bands. The multiple frequency bands or channels may comprise any number of frequency ranges for exchanging wireless transmissions between wireless communication devices. Each of the multiple transceivers may be configured to operate on a different frequency band of the multiple frequency bands.

[0117] The plurality of wireless transceivers may include a first wireless transceiver configured to receive a first signal via a first frequency band. The first wireless transceiver may be configured for Wi-Fi wireless communication. The first wireless transceiver may also be configured for wireless communication using other technologies (e.g., non-Wi-Fi communication), such as Bluetooth, Zipline, Thread, Z-Wave, cellular networks (e.g., including 4G and 5G cellular network communication), ultra-wideband (UWB), or Internet of Things (IoT) communication.

[0118] The first wireless transceiver may include any number of active or passive electronic components for generating, shaping, modulating, demodulating, or otherwise processing wirelessly transmitted signals. For example, the first wireless transceiver may include any one or more of the following: a first bandpass filter, a first converter (e.g., an up-conversion converter or a down-conversion converter), an equalizer, or a demodulator. For example, the first wireless transceiver may be a transceiver configured for Wi-Fi wireless communication via at least one of a 5 GHz band or a 6 GHz band in the Wi-Fi or WLAN frequency band. The first wireless transceiver of a plurality of wireless transceivers may be configured to receive a first signal via a first frequency band and may include a demodulator configured to demodulate the first signal to extract the signal of interest (e.g., the received signal with interference removed) when interference is reduced from the first signal.

[0119] For example, a first wireless transceiver may receive signals via an antenna configured to receive wireless signals via a given frequency band or channel (e.g., 5 GHz or 6 GHz). The signals may be processed by a bandpass filter configured for the given frequency band or channel and by a low-noise amplifier. The output from the low-noise amplifier may be processed by a downconverter to adjust, reduce, or remove the carrier frequency and provide an output that is input to a demodulator for equalization-based signal or output removal of interfering signals.

[0120] At 710, the device may transmit a second signal via a second frequency band for wireless communication. The second frequency band for wireless communication may be any remaining frequency band or channel other than the first frequency band or channel of the first transceiver that receives the first signal (e.g., the remainder of a 5 GHz or 6 GHz Wi-Fi band). The method may include the circuitry transmitting the second signal via the second frequency band of a plurality of frequency bands. The second signal may interfere with the first signal. The interference may include: a central portion of the interference, which may contain a peak value of the interfering signal at a given frequency point; and a tail portion, which may cover an extended frequency range where the signal strength is lower than that of the central portion. The tail portion of the interference may cross the frequency band of the transmitted (e.g., second) signal and may extend into or through the frequency band of the first signal.

[0121] A second wireless transceiver for transmitting a second signal may comprise any number of electronic components, including any one or more of the following: a modulator, an up-converter, a power amplifier, a coupler, or a bandpass filter. The modulator may be configured to modularize the transmitted data into a signal, the output of which may be input to the up-converter to include a carrier signal corresponding to a second frequency band or channel of the transmitted signal. The output signal from the up-converter may be input to the power amplifier, which amplifies the signal and provides it for coupling by the coupler. The coupler may output the transmitted signal to the bandpass filter to filter the signal according to the second frequency band or channel for transmission via the antenna. The coupler may output a transmitted sample signal, which may contain a copy of the transmitted signal in a lower signal strength range, for example, a signal strength 20 to 30 dB weaker than the transmitted signal to be transmitted via the antenna.

[0122] At 715, the device can filter out the central portion of interference from samples of the second signal. The method may include a coupler of a second transceiver transmitting a second signal, providing the transmitted sample signal to a filter in an interference mitigation circuitry system. The interference mitigation circuitry system may include a bandpass filter for filtering the sample signal and a downconverter for down-converting the carrier frequency of the bandpass-filtered signal into a signal or baseband signal with a different carrier frequency. This filtered signal or filtered baseband signal with a different carrier frequency may be input to an equalizer in the interference mitigation circuitry system to generate a signal based on which interference (e.g., the tail portion of interference) can be subtracted, removed, attenuated, or reduced at the first transceiver from the first signal (e.g., the received signal).

[0123] The circuit system may include multiple interference mitigation circuitry systems for multiple transceivers to reduce multiple tailing interferences from multiple concurrently transmitted signals from a received (e.g., first) signal. In some configurations where power amplifier modeling is used to remove interference from the received signal, the interference mitigation circuitry system may include a power amplifier model that models an amplified modulated signal from a modulator to generate a third signal via an equalizer to remove tailing interference from the first (e.g., received) signal using a demodulator of the first transceiver.

[0124] The method may include the circuitry (e.g., an interference mitigation circuitry) using a bandpass filter to reduce the central portion of interference from samples of a second signal (e.g., a second signal received from a coupler of a second transceiver) to provide a filtered sample signal. The method may also include a filter (e.g., a bandpass filter) receiving samples of a first signal from the output of an amplifier of a wireless transceiver configured to transmit the second signal. The filter may reduce, attenuate, or remove frequencies outside a predetermined range from the transmitted samples of the first signal, such as frequencies corresponding to the central portion of interference. The filter may remove or attenuate interference corresponding to the frequency band or channel of a second (e.g., transmitting) transceiver.

[0125] At 720, the device can adjust the carrier frequency of the filtered sample signal. The method may include adjusting the carrier frequency of the filtered sample signal by a converter relative to the carrier frequency of a second signal to provide a converted sample signal. For example, a downconverter can adjust, modify, or change the carrier frequency of a bandpass-filtered transmitted sample to generate a signal with a changed, modified, reduced, or removed carrier frequency. For example, the converter may include a downconverter configured to adjust the carrier frequency of the filtered sample signal to provide a converted sample signal at a baseband frequency (e.g., no carrier frequency). The output from the downconverter can be input to an equalizer in an interference mitigation circuitry system.

[0126] At 725, the device can identify the tail portion of interference from the adjusted and filtered sample signal to generate a third signal. The method may include an equalizer identifying the tail portion of interference from the converted sample signal. The equalizer may output or provide a third signal to cancel interference from the first signal, including, for example, the tail portion of interference that may remain in the first signal (e.g., a signal received via the first transceiver).

[0127] The equalizer can be configured to set one or more parameters. These parameters control the equalizer to adjust at least one of the gain of a third signal relative to the gain of a first signal or the frequency response of the third signal relative to the frequency response of the first signal. For example, the parameters can adjust the third signal to match the first signal in terms of gain, signal strength, amplitude, or frequency. The parameters can also adjust the phase of the third signal relative to the phase of the first signal. One or more parameters can be adjusted or tuned based on a feedback signal, which may include at least one of a down-converted and amplified first signal (e.g., a received signal) or a feedback signal from a demodulator of a first transceiver.

[0128] The equalizer can be configured to set one or more parameters to adjust the third signal to compensate for distortion in the first signal. The equalizer can utilize a least-squares function to reduce the difference between the signal generated based on the third signal and the first signal. The least-squares function can be configured to use a least-mean-squares (LMS) operation to track the changes in the first signal over a time interval. The LMS operation can be configured to iteratively adjust the equalizer parameters to control the third signal to reduce the error of the difference between the signal generated using the third signal and the first signal.

[0129] At 730, the device can use a third signal to reduce interference caused by the second signal from the first signal. The method may include a demodulator in an interference mitigation circuitry system reducing interference from the first signal at least based on the third signal. For example, the demodulator may be configured to reduce interference from the first signal by subtracting a signal generated by an equalizer using the third signal from the first signal. For example, the demodulator may be configured to combine the first signal with the third signal to remove interference (e.g., the tail portion of the interference) from the received signal. This combination may include a weighted addition or subtraction of the two signals or a subtraction of the spectra of the two signals in the frequency domain.

[0130] The demodulator may include a third signal from the second equalizer to remove second interference (e.g., a second tail portion of the second interference) from another (e.g., a second) transmission from another transceiver at the device. The demodulator may receive another third signal from the second equalizer to combine with the first signal to remove the second tail portion of the second interference from the first (e.g., received) signal.

[0131] Some illustrative embodiments have been described, and it is obvious that the foregoing is illustrative and non-limiting, and has been provided by way of example. Specifically, although many of the examples presented herein involve specific combinations of method actions or system elements, those actions and elements can be combined in other ways to achieve the same objective. The actions, elements, and features discussed in connection with one embodiment are not intended to be excluded from similar roles in other embodiments.

[0132] The wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising,” “including,” “having,” “containing,” “involving,” “characterized by,” “featured in,” and variations thereof herein is intended to cover the items listed thereafter, their equivalents, and additional items, as well as alternative embodiments comprised of the items specifically listed thereafter. In one embodiment, the system and method described herein comprise each combination or all of the described elements, actions, or components.

[0133] Any reference to an embodiment, element, or action of a system or method mentioned in the singular herein may also cover embodiments that include multiple such elements, and any reference to any embodiment, element, or action mentioned in the plural herein may also cover embodiments that include only a single element. References in the singular or plural form are not intended to limit the currently disclosed systems or methods, their components, actions, or elements to a single or multiple configuration. A reference to any action or element based on any information, action, or element may include an embodiment where said action or element is at least partially based on any information, action, or element.

[0134] Any embodiment disclosed herein may be combined with any other embodiment or example, and references to “implementation,” “some embodiments,” “an embodiment,” or the like are not necessarily mutually exclusive and are intended to indicate that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment or example. Such terms as used herein do not necessarily all refer to the same embodiment. Any embodiment may be combined with any other embodiment in any manner consistent with the aspects and embodiments disclosed herein, inclusively or exclusively.

[0135] A reference to "or" can be interpreted as inclusive, such that any term described using "or" can refer to a single term, more than one term, or any one of all the terms described. A reference to at least one term in a list of conjunctions can be interpreted as inclusive or to refer to a single term, more than one term, or any one of all the terms described. For example, a reference to "at least one of 'A' and 'B'" can include only 'A', only 'B', or both 'A' and 'B'. Such references used in conjunction with "include" or other open terms can include additional items.

[0136] When a reference numeral follows a technical feature in the drawings, detailed description, or any claim, the reference numeral is included to enhance the comprehensibility of the drawings, detailed description, and claims. Therefore, the reference numeral, or its absence, has no limiting effect on the scope of any claim element.

[0137] When an element is referred to herein as “connected” or “coupled” to another element, it should be understood that the element may be directly connected or coupled to the other element or that there may be an intermediary element between the connected or coupled elements. Conversely, when an element is referred to as “directly connected” or “directly coupled” to another element, it should be understood that there is no intermediary element in the “direct” connection between the elements. However, the presence of a direct connection does not preclude the possibility of other connections in which intermediary elements may be present.

[0138] When an element is referred to herein as being “placed” below or above a particular element, it should be understood that the element may be directly located above or below another element, or that there may be an intermediary element between the two elements. Conversely, when an element is referred to as being “directly placed” on or below another element, it should be understood that there is no intermediary element in the “direct” placement between the elements. However, the presence of direct placement does not preclude other placements in which intermediary elements may be present.

[0139] Although the operations are depicted in a specific order in the diagrams, it is not required that such operations be performed in the specific order shown or in a sequential order, nor is it required that all the described operations be performed. The actions described herein may be performed in different orders. Separation of various system components is not required in all implementations, and the described program components may be contained in a single hardware or software product.

Claims

1. A system comprising: Multiple wireless transceivers, each of which operates on a different frequency band in multiple frequency bands; A circuit system, which is used for: The first signal is received via a first frequency band among the plurality of frequency bands; A second signal is transmitted via a second frequency band of the plurality of frequency bands, and the second signal interferes with the first signal, the interference including a central portion and a tail portion; A bandpass filter is used to reduce the central portion of the interference from samples of the second signal to provide a filtered sample signal; A converter for adjusting the carrier frequency of the filtered sample signal relative to the carrier frequency of the second signal to provide a converted sample signal; An equalizer is used to identify the tail portion of the interference from the converted sample signal to provide a third signal to cancel the interference from the first signal; and A demodulator, used to reduce the interference from the first signal based at least on the third signal.

2. The system of claim 1, wherein the plurality of wireless transceivers includes a first wireless transceiver for receiving the first signal and a second wireless transceiver for transmitting the second signal, the first wireless transceiver and the second wireless transceiver each being configured for Wi-Fi wireless communication.

3. The system according to claim 2, wherein the first wireless transceiver includes a first bandpass filter, a first converter, the equalizer and the demodulator, and the second wireless transceiver includes the bandpass filter and the converter.

4. The system of claim 3, wherein the first wireless transceiver is configured to perform Wi-Fi wireless communication via a first of a 5 GHz band or a 6 GHz band, and the second wireless transceiver is configured to perform Wi-Fi wireless communication via a second of the 5 GHz band or the 6 GHz band.

5. The system according to claim 1, comprising: A first wireless transceiver of the plurality of wireless transceivers is configured to receive the first signal via the first frequency band, and wherein the first wireless transceiver includes the demodulator, and wherein the demodulator is configured to demodulate the first signal to extract the signal of interest after the interference is reduced from the first signal.

6. The system of claim 1, wherein the bandpass filter is configured to: The sample of the first signal is received from the output of the amplifier of the wireless transceiver configured to transmit the second signal from the plurality of wireless transceivers; and The frequency of the sample from the first signal is reduced to a frequency outside the predetermined range corresponding to the central portion.

7. The system of claim 1, wherein the converter is configured to adjust the carrier frequency of the filtered sample signal to provide the converted sample signal at a baseband frequency.

8. The system of claim 1, wherein the equalizer is configured to set one or more parameters, the one or more parameters controlling the equalizer to adjust at least one of the gain of the third signal according to the gain of the first signal or the frequency response of the third signal according to the frequency response of the first signal.

9. The system of claim 8, wherein the equalizer is configured to set the one or more parameters to adjust the third signal to cancel out distortion in the first signal.

10. The system of claim 1, wherein the equalizer utilizes a least squares function to reduce the difference between the signal generated based on the third signal and the first signal, wherein the least squares function is configured to track the change of the first signal over a time interval using a least mean square (LMS) operation.

11. The system of claim 10, wherein the LMS operation is configured to iteratively adjust the parameters of the equalizer to control the third signal to reduce the error of the difference between the signal generated using the third signal and the first signal.

12. The system of claim 1, wherein the demodulator is configured to reduce the interference from the first signal by subtracting a signal generated by the equalizer using a third signal from the first signal.

13. A method comprising: A first signal is received by a circuit system comprising multiple wireless transceivers via a first frequency band of multiple frequency bands, each of the multiple transceivers operating on a different frequency band of the multiple frequency bands; The circuit system transmits a second signal via a second frequency band of the plurality of frequency bands, and the second signal interferes with the first signal, the interference including a central portion and a tail portion; The central portion of the interference is reduced from the samples of the second signal by a bandpass filter to provide a filtered sample signal; The carrier frequency of the filtered sample signal is adjusted by the converter relative to the carrier frequency of the second signal to provide the converted sample signal; An equalizer identifies the tail portion of the interference from the converted sample signal to provide a third signal to cancel the interference from the first signal; and The demodulator reduces the interference from the first signal based at least on the third signal.

14. The method of claim 13, wherein the plurality of wireless transceivers includes a first wireless transceiver for receiving the first signal and a second wireless transceiver for transmitting the second signal, the first wireless transceiver and the second wireless transceiver are each configured for Wi-Fi wireless communication, and wherein the first wireless transceiver includes a first bandpass filter, a first converter, the equalizer and the demodulator and the second wireless transceiver includes the bandpass filter and the converter.

15. The method of claim 14, wherein the first wireless transceiver is configured to perform Wi-Fi wireless communication via a first of a 5 GHz band or a 6 GHz band, and the second wireless transceiver is configured to perform Wi-Fi wireless communication via the 5 GHz band or the 6 GHz band.

16. The method of claim 13, further comprising: The sample of the first signal is received by the bandpass filter from the output of the amplifier of one of the plurality of wireless transceivers, wherein the wireless transceivers are configured to transmit the second signal; and The bandpass filter reduces the frequency of the first signal from the sample outside the predetermined range corresponding to the central portion.

17. The method of claim 13, further comprising: The carrier frequency of the filtered sample signal is adjusted by the converter to provide the converted sample signal at the baseband frequency; and The equalizer is configured with one or more parameters that control the equalizer to adjust at least one of the following: the gain of the third signal based on the gain of the first signal, and the frequency response of the third signal based on the frequency response of the first signal, to counteract distortion in the first signal.

18. The method of claim 13, further comprising: The difference between the signal generated based on the third signal and the first signal is reduced by the least squares function of the equalizer, wherein the least squares function is configured to track the change of the first signal over a time interval using the least mean square (LMS) operation.

19. The method of claim 13, further comprising: The third signal is iteratively adjusted via parameters used to control the equalizer to reduce the error between the signal generated using the third signal and the first signal.

20. A circuit system comprising: A plurality of wireless transceivers configured to operate on a first frequency band of a plurality of frequency bands for Wi-Fi wireless communication and a second frequency band of the plurality of frequency bands for Wi-Fi wireless communication, the plurality of wireless transceivers being configured to: The first signal is received via a first frequency band among the plurality of frequency bands; and A second signal is transmitted via a second frequency band of the plurality of frequency bands, the second signal interfering with the first signal, the interference including a central portion and a tail portion, wherein the plurality of wireless transceivers include: A bandpass filter is used to reduce the central portion of the interference from samples of the second signal to provide a filtered sample signal; A converter for adjusting the carrier frequency of the filtered sample signal relative to the carrier frequency of the second signal to provide a converted sample signal; An equalizer for identifying the tail portion of the interference from the converted sample signal to provide a third signal to cancel the interference from the first signal; and A demodulator, used to reduce the interference from the first signal based at least on the third signal.

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