Frequency rapid and agile simultaneous and same-frequency-band full-duplex communication device and method

Abstract

The invention provides a same-time same-frequency-band full duplex communication device with rapid and agile frequency. Comprising a duplexer, a first frequency hopping wave trap, a first radio frequency amplifier, a first frequency hopping filter, a second frequency hopping wave trap, a second radio frequency amplifier, a second frequency hopping filter, a third radio frequency amplifier, a band-pass filter, an analog-to-digital converter, a standard frequency, a channel controller, a baseband processor, a digital-to-analog converter, a fourth radio frequency amplifier and a third frequency hopping filter. A fifth radio frequency amplifier; and a fourth frequency hopping filter. According to the simultaneous same-frequency-band full-duplex communication device with the fast and agile frequency, the working frequency of the full-duplex communication device covers 100 MHz to 1 GHz, the frequency range is wide, the communication efficiency is high, time delay is small, self-interference generated by a local transmitter is effectively restrained, application of a full-duplex communication system in the wide-frequency-band simultaneous same-frequency-band high-speed frequency hopping process can be met, and the full-duplex communication device is suitable for wide-frequency-band simultaneous same-frequency-band high-speed frequency hopping. The transceiving isolation of the system duplexer is greater than 30dBc, and the notch suppression capability of the receiving path is greater than 65dBc.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a full-duplex communication device and method for fast frequency agile simultaneous same-frequency band communication. Background Art

[0002] With the continuous development of wireless communication technology, the increasing number of mobile terminals, and people's demand for ubiquitous communication networks, communication technologies that can bring network expansion and capacity improvement are ushering in new development opportunities. In order to improve spectrum utilization and communication efficiency, communication systems adopt full-duplex technology. Full-duplex communication modes are mainly divided into different-frequency full-duplex and same-frequency full-duplex.

[0003] Hetero-frequency full-duplex communication refers to a working mode in which both communicating parties transmit uplink and downlink data information in different frequency bands respectively, and can transmit messages at the same time. Hetero-frequency full-duplex communication equipment generally uses two independent channels to implement frequency division duplex working mode. A protection band needs to be set between the two channels. The frequency bands used by the uplink and downlink do not cross and are completely separated, that is, the transmitting and receiving working frequency bands are far apart to prevent mutual interference between adjacent transmitting channels and receiving channels. Hetero-frequency full-duplex communication successfully avoids interference with its own signals, but there is a significant throughput loss because additional frequency resources need to be allocated for signal forwarding, and the loss of throughput represents the loss of spectrum efficiency. In order to prevent interference between transmission and reception, the interval between the transmission and reception protection bands is relatively wide, so the protection band is wasted. At the same time, since the receiving band can only be used for reception and the transmitting band can only be used for transmission, they cannot be cross-used, which reduces the spectrum efficiency. For the frequency hopping system, the receiving and transmitting frequency hopping can only be realized within their respective frequency bands, and the frequency hopping bandwidth is narrow and the anti-interference ability is weak.

[0004] The same-frequency full-duplex communication refers to the simultaneous reception and transmission of signals at the same frequency and the same time slot. Therefore, its spectrum utilization rate is doubled compared with the existing time division duplex and frequency division duplex, and the system throughput can be doubled under the same conditions. In the same-frequency full-duplex communication, the reception and transmission of signals are carried out at the same frequency at the same time. The self-transmitting signal will cause strong interference to the receiving channel. Since the transmission and reception are at the same frequency, the useful signal sent by the remote transmitter received by the local receiver is very weak, which will be completely submerged by the same-frequency signal sent by the local transmitter (interference signal for the receiver itself), and cannot be effectively quantified by the ADC, let alone correctly demodulated at the baseband. The use of self-interference suppression technology to reduce the interference of strong signals at the same frequency is not ideal.

[0005] Therefore, it is necessary to provide a full-duplex communication device with fast frequency agility and the same frequency band to solve the above technical problems. Summary of the invention

[0006] The present invention provides a full-duplex communication device with rapid frequency agility and the same frequency band, which solves the problem that the receiving and transmitting frequency bands of full-duplex communication with different frequencies are completely separated and there is no self-interference, but the receiving and transmitting frequency bands cannot be cross-used, which reduces the spectrum efficiency, has a narrow frequency hopping bandwidth, and has a weak anti-interference ability. The full-duplex communication with the same frequency has high efficiency, but there is strong same-frequency self-interference, and there is no effective measure to eliminate the same-frequency self-interference, so the application is limited.

[0007] In order to solve the above technical problems, the present invention provides a full-duplex communication device with fast frequency agility and the same frequency band, comprising: A duplexer, a first frequency hopping notch filter, a first RF amplifier, a first frequency hopping filter, a second frequency hopping notch filter, a second RF amplifier, a second frequency hopping filter, a third RF amplifier, a bandpass filter, an analog-to-digital converter, a standard frequency, a channel controller, a baseband processor, a digital-to-analog converter, a fourth RF amplifier, a third frequency hopping filter, a fifth RF amplifier, a fourth frequency hopping filter, an excitation amplifier, a power amplifier, a power amplifier detection circuit, a co-site filter, and a power management; The duplexer input end is connected to the co-site filter, the output end is connected to the signal input end of the first frequency hopping notch filter, the signal output end of the first frequency hopping notch filter is connected to the signal input end of the first radio frequency amplifier, the signal output end of the first radio frequency amplifier is connected to the signal input end of the first frequency hopping filter, the signal output end of the first frequency hopping filter is connected to the signal input end of the second frequency hopping notch filter, and the signal output end of the second frequency hopping notch filter is connected to the signal input end of the second radio frequency amplifier; The signal output end of the second RF amplifier is connected to the signal input end of the second frequency hopping filter, the signal output end of the second frequency hopping filter is connected to the signal input end of the third RF amplifier, and the signal output end of the third RF amplifier is connected to the signal input end of the bandpass filter; The signal output end of the bandpass filter is connected to the signal input end of the analog-to-digital converter, and the RF digital signal output end of the analog-to-digital converter is connected to the signal input end of the baseband processor; The RF digital signal output end of the baseband processor is connected to the signal input end of the digital-to-analog converter, the control signal output end of the baseband processor is connected to the control signal input end of the channel controller, the signal output end of the digital-to-analog converter is connected to the signal input end of the fourth RF amplifier, the signal output end of the fourth RF amplifier is connected to the signal input end of the third frequency hopping filter, the signal output end of the third frequency hopping filter is connected to the signal input end of the fifth RF amplifier, the signal output end of the fifth RF amplifier is connected to the signal input end of the fourth frequency hopping filter, the signal output end of the fourth frequency hopping filter is connected to the signal input end of the excitation amplifier, the signal output end of the excitation amplifier is connected to the signal input end of the power amplifier, the signal output end of the power amplifier is connected to the signal input end of the power amplifier detection circuit, and the signal output end of the power amplifier detection circuit is connected to the signal input end of the co-address filter.

[0008] Preferably, the first frequency hopping filter and the second frequency hopping filter are used to receive the frequency control signal output by the channel controller, track and tune the selected received useful radio frequency signal, and filter out out-band interference.

[0009] Preferably, the first frequency hopping notch filter and the second frequency hopping notch filter are used to receive the frequency control signal output by the channel controller, forming a band-stop filter to suppress the radio frequency signal of the own transmitter from entering the receiving channel, thereby reducing interference to the receiving path.

[0010] Preferably, the first RF amplifier, the second RF amplifier and the third RF amplifier are used to amplify weak RF signals received by the receiver antenna so that the RF signal amplitude and signal-to-noise ratio meet the requirements of the analog-to-digital converter for RF digitization.

[0011] Preferably, the bandpass filter is used to filter out interference and noise outside the working frequency band.

[0012] Preferably, the analog-to-digital converter is used to digitize the received radio frequency analog signal, and the digital-to-analog converter is used to convert the transmitted baseband digital signal into a radio frequency signal.

[0013] Preferably, the fourth RF amplifier and the fifth RF amplifier are used to amplify the small RF signal emitted by the receiver digital-to-analog converter to drive the subsequent amplification circuit.

[0014] Preferably, a disassembly assembly is provided on the surface of the duplexer, and the disassembly assembly includes a disassembly cover, a plurality of L-shaped connecting blocks, a plurality of mounting blocks, two mounting grooves and two fixing bolts, the plurality of L-shaped connecting blocks are respectively connected to both sides of the disassembly cover, the plurality of mounting blocks are respectively connected to one end of the plurality of L-shaped connecting blocks, and the two mounting grooves are respectively opened on both sides of the surface of the duplexer.

[0015] Preferably, the two fixing bolts are respectively arranged between two of the mounting blocks and the duplexer.

[0016] A method for a full-duplex communication device with a same frequency band and a fast frequency agile change, used for the full-duplex communication device with a fast frequency agile change and a same frequency band, comprises the following steps: S1. The RF signal received by the antenna passes through the unidirectional characteristics of the duplexer, and the receiving signal enters the receiving channel. First, it passes through the first frequency hopping notch filter to suppress the transmitting interference signal coupled from the transmitting channel. The useful receiving signal and the interference signal are amplified by the first RF amplifier, and then the first frequency hopping filter selects the useful signal, and the transmitting interference signal is filtered and attenuated. Then, the second frequency hopping notch filter is used to further suppress the transmitting interference signal. The useful signal and the transmitting interference signal are amplified by the second RF amplifier, and then the second frequency hopping filter selects the useful signal, and the transmitting interference signal is further filtered and attenuated. Finally, it is amplified by the third RF amplifier and sent to the analog-to-digital converter through a bandpass filter. The frequency hopping notch filter in the receiving channel has a great inhibitory and attenuating effect on the transmitting interference signal. At the same time, the frequency hopping filter in the channel also has a certain attenuation suppression ability for the transmitting interference signal. Although multiple stages of amplification are designed in the channel, it is still ensured that the transmitting interference signal in the channel is greatly attenuated, and the useful signal is selected and amplified to meet the subsequent digitization of the analog-to-digital converter and the demodulation and decoding processing of the baseband processor; S2, the transmitted digital signal is coded and modulated by the baseband processor to become a modulated baseband signal, and then sent to the transmission channel digital-to-analog converter to be converted into a radio frequency signal. The radio frequency signal is amplified by the fourth radio frequency amplifier, frequency-selective filtered by the third frequency hopping filter, further amplified and frequency-selective filtered by the fifth radio frequency amplifier and the fourth frequency hopping filter, and then amplified to the required power by the excitation amplifier and the power amplifier cascade, and the transmitter power is controlled by the power amplifier detection circuit and the channel controller. The radio frequency power signal is further frequency-selective filtered by the co-location filter to suppress harmonics, out-of-band spurious and noise, and then the signal is transmitted from the antenna through the unidirectional characteristics of the duplexer; S3, the standard frequency generates a reference frequency of 57.6MHz, which is sent to the analog-to-digital converter, analog-to-digital converter, channel controller, and baseband processor as the working clock of each module; S4. The channel controller sends control frequency words, clocks, enable signals and control signals to the first frequency hopping notch filter, the second frequency hopping notch filter, the first frequency hopping filter, the second frequency hopping filter, the third frequency hopping filter, the fourth frequency hopping filter and the co-site filter according to the operating frequency of the transceiver channel.

[0017] Compared with the related art, the present invention provides a fast frequency agile full-duplex communication device in the same frequency band, which has the following beneficial effects: The present invention provides a full-duplex communication device with fast and agile frequency change and the same frequency band. The full-duplex communication device has an operating frequency covering 100MHz to 1GHz, a wide frequency range, high communication efficiency, and low delay, and can effectively suppress the self-interference generated by a local transmitter, and can meet the application of a full-duplex communication system in a wide frequency band and the same frequency band with high-speed frequency hopping. The system duplexer has a transceiver isolation greater than 30dBc, a receiving path notch suppression capability greater than 65dBc, and a frequency hopping filter out-of-band suppression capability greater than 20dBc. Therefore, the system has a suppression capability of greater than 115dBc for transmitting interference signals, and realizes a good suppression capability of the receiving path for transmitting interference signals, ensuring normal full-duplex communication in the same frequency band. The full-duplex communication device is very suitable for the application environment of a high-performance full-duplex communication system, and can be applied to a full-duplex communication system in any frequency band by selecting a corresponding frequency hopping notch filter, a frequency hopping filter, and an amplifier. The full-duplex communication device has the advantages of high spectrum utilization and communication efficiency, a wide frequency range, strong self-interference suppression capability, and good frequency hopping anti-interference performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a first embodiment of a full-duplex communication device with fast frequency agility and the same frequency band provided by the present invention; Figure 2 This is a schematic diagram of the working principle of the frequency hopping notch filter; Figure 3 A schematic structural diagram of a second embodiment of a full-duplex communication device with fast frequency agility and the same frequency band provided by the present invention; Figure 4 for Figure 3 An enlarged schematic diagram of part A is shown; Figure 5 for Figure 3 The three-dimensional structural schematic diagram of the duplexer shown.

[0019] Numbers in the figure: 1, duplexer; 2, first frequency hopping notch filter; 3, first RF amplifier; 4, first frequency hopping filter; 5, second frequency hopping notch filter; 6, second RF amplifier; 7, second frequency hopping filter; 8, third RF amplifier; 9, bandpass filter; 10, analog-to-digital converter; 11, standard frequency; 12, channel controller; 13, baseband processor; 14, digital-to-analog converter; 15, fourth RF amplifier; 16, third frequency hopping filter; 17, fifth RF amplifier; 18, fourth frequency hopping filter; 19, excitation amplifier; 20, power amplifier; 21, power amplifier detection circuit; 22, co-site filter; 23, power management; 24. Disassembly assembly; 241. Disassembly cover; 242. L-shaped connecting block; 243. Mounting block; 244. Mounting slot; 245. Fixing bolt. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0021] First embodiment

[0022] Please refer to Figure 1 and Figure 2 ,in, Figure 1 A schematic structural diagram of a first embodiment of a full-duplex communication device with fast frequency agility and the same frequency band provided by the present invention; Figure 2 A full-duplex communication device with fast frequency agility and the same frequency band, comprising: Duplexer 1, first frequency hopping notch filter 2, first radio frequency amplifier 3, first frequency hopping filter 4, second frequency hopping notch filter 5, second radio frequency amplifier 6, second frequency hopping filter 7, third radio frequency amplifier 8, band pass filter 9, analog-to-digital converter 10, standard frequency 11, channel controller 12, baseband processor 13, digital-to-analog converter 14, fourth radio frequency amplifier 15, third frequency hopping filter 16, fifth radio frequency amplifier 17, fourth frequency hopping filter 18, excitation amplifier 19, power amplifier 20, power amplifier detection circuit 21, co-site filter 22 and power management 23; The input end of the duplexer 1 is connected to the co-site filter 22, the output end is connected to the signal input end of the first frequency hopping notch filter 2, the signal output end of the first frequency hopping notch filter 2 is connected to the signal input end of the first RF amplifier 3, the signal output end of the first RF amplifier 3 is connected to the signal input end of the first frequency hopping filter 4, the signal output end of the first frequency hopping filter 4 is connected to the signal input end of the second frequency hopping notch filter 5, and the signal output end of the second frequency hopping notch filter 5 is connected to the signal input end of the second RF amplifier 6; The signal output end of the second RF amplifier 6 is connected to the signal input end of the second frequency hopping filter, the signal output end of the second frequency hopping filter 7 is connected to the signal input end of the third RF amplifier 8, and the signal output end of the third RF amplifier 8 is connected to the signal input end of the bandpass filter 9; The signal output end of the bandpass filter 9 is connected to the signal input end of the analog-to-digital converter 10, and the RF digital signal output end of the analog-to-digital converter 10 is connected to the signal input end of the baseband processor 13; The RF digital signal output end of the baseband processor 13 is connected to the signal input end of the analog-to-digital converter 10, the control signal output end of the baseband processor 13 is connected to the control signal input end of the channel controller 12, the signal output end of the analog-to-digital converter 10 is connected to the signal input end of the fourth RF amplifier 15, the signal output end of the fourth RF amplifier 15 is connected to the signal input end of the third frequency hopping filter 16, the signal output end of the third frequency hopping filter 16 is connected to the signal input end of the fifth RF amplifier 17, the signal output end of the fifth RF amplifier 17 is connected to the signal input end of the fourth frequency hopping filter 18, the signal output end of the fourth frequency hopping filter 18 is connected to the signal input end of the excitation amplifier 19, the signal output end of the excitation amplifier 19 is connected to the signal input end of the power amplifier 20, the signal output end of the power amplifier 20 is connected to the signal input end of the power amplifier detection circuit 21, and the signal output end of the power amplifier detection circuit 21 is connected to the signal input end of the co-location filter 22.

[0023] The first frequency hopping filter 4 and the second frequency hopping filter 7 are used to receive the frequency control signal output by the channel controller, track and tune the selected received useful radio frequency signal, and filter out out-band interference.

[0024] The first frequency hopping notch filter 2 and the second frequency hopping notch filter 5 are used to receive the frequency control signal output by the channel controller, and form a band-stop filter to suppress the radio frequency signal of the transmitter itself from entering the receiving channel, thereby reducing interference to the receiving path.

[0025] The first RF amplifier 3, the second RF amplifier 6 and the third RF amplifier 8 are used to amplify the weak RF signal received by the receiver antenna so that the RF signal amplitude and signal-to-noise ratio meet the requirements of the analog-to-digital converter for RF digitization.

[0026] The bandpass filter 9 is used to filter out interference and noise outside the working frequency band.

[0027] The analog-to-digital converter 10 is used to digitize the received radio frequency analog signal, and the digital-to-analog converter 14 is used to convert the transmitted baseband digital signal into a radio frequency signal.

[0028] The fourth RF amplifier 15 and the fifth RF amplifier 17 are used to amplify the small RF signal emitted by the receiver digital-to-analog converter to drive the subsequent amplification circuit.

[0029] The standard frequency generator is used to generate a reference frequency signal of 57.6 MHz, and send the reference frequency signal to the channel controller, the baseband processor controller, the analog-to-digital converter and the digital-to-analog converter; The baseband processor 13 is used to down-convert, filter, and demodulate the received RF digital signal, modulate, filter, and up-convert the transmitted digital signal, and generate a channel control signal; The channel controller 12 is used to receive the control signal from the baseband processor 13, generate the frequency word information of the receiving channel, perform tuning control on the receiving channel frequency hopping filter, frequency hopping notch filter, the transmitting channel frequency hopping filter, co-address filter, etc., and control the channel state. The control signal includes the control frequency word, clock and enable signal; The duplexer 1 is used for sharing the transmitting and receiving antennas and isolating the transmitting and receiving antennas, so that the signal can only be transmitted in one direction along a specific direction, thereby ensuring a high degree of isolation between the transmitting and receiving antennas.

[0030] The third frequency hopping filter 16 and the fourth frequency hopping filter 18 are used to receive the frequency control signal output by the channel controller, tune and select the useful radio frequency signal to be sent, filter out-band interference and reduce out-band noise; The RF excitation amplifier 19 and the power amplifier 20 are cascaded to amplify the RF signal to a suitable power to meet the communication distance requirement; The power amplifier detection circuit 21 is used to sense the transmission frequency power signal, complete the transmitter power control after detection processing, and at the same time sense the signal reflected from the antenna port, complete the transmitter protection after detection processing; The co-site filter 22 is used to receive the frequency control signal output by the channel controller, tune and select the high-power radio frequency useful signal to be transmitted, filter out the transmitter harmonics and out-of-band interference, and reduce the out-of-band noise; The duplexer 1 is composed of a radio frequency transformer with a balanced network and a peripheral matching circuit; The first frequency hopping wave trap 2 and the second frequency hopping wave trap 5 are composed of high-Q binary capacitors with high voltage resistance, loop inductors, PIN diodes and peripheral power conversion, filter capacitors, and rated current inductors; The first frequency hopping filter 4, the second frequency hopping filter 7, the third frequency hopping filter 16 and the fourth frequency hopping filter 18 are composed of high Q value binary capacitors, loop inductors, PIN diodes and peripheral power conversion, filter capacitors and choke inductors; The first RF amplifier 3 and the fourth RF amplifier 15 are composed of a RF integrated circuit PSA4-5043+ and its peripheral inductors and capacitors; The second RF amplifier 6, the third RF amplifier 8 and the fifth RF amplifier 17 are composed of a RF integrated circuit PHA-13LN+ and its peripheral inductors and capacitors; The bandpass filter 9 is composed of a Chebyshev function filter; The analog-to-digital converter 10 is composed of AD9689 and peripheral circuits of AD Company; The standard frequency 11 is composed of a temperature compensated oscillator and a matching circuit; The channel controller 12 is composed of a Xilinx XC3S400-4FG320I FPGA chip and peripheral resistors and capacitors.

[0031] The baseband processor 13 is composed of a ZYNQ 7030 FPGA chip from Xilinx and peripheral resistors and capacitors; The digital-to-analog converter 14 is composed of AD9172 and peripheral circuits of AD Company; The driver amplifier 19 and the power amplifier 20 are composed of two-stage GaN transistors and input and output matching circuits; The power amplifier detection circuit 21 is composed of a radio frequency coupling cable directional coupler and AD8361 forward and reverse power sampling circuits of AD Company. The forward and reverse power sampling circuits use AD8361 integrated circuits of AD Company, which can convert the collected radio frequency power signal into a corresponding DC voltage, and then output it to the digital module after amplification by the operational amplifier. The power control and radio station protection control are performed by collecting power information. The co-site filter 22 is composed of a high-Q binary capacitor with high voltage resistance, a loop inductor, a PIN diode and a peripheral power conversion, a filter capacitor and a rated current inductor.

[0032] Reference Figure 2 , the working principle of the frequency hopping notch filter of the device of the present invention is described as follows: The frequency hopping filter is composed of a two-stage band-stop tuning circuit and a coupling circuit. The band-stop tuning circuit is composed of a fixed inductor, a binary capacitor and a PIN switch diode. Figure 2 As shown. Each binary capacitor in the tuning loop is controlled by the connected tuning data V to connect to the tuning loop. When the tuning data V is a high voltage, VD (PIN diode) is turned off and the binary capacitor is disconnected. When the tuning data V is a low voltage (negative voltage), VD (PIN diode) is turned on and the binary capacitor is connected. A notch tuning circuit is formed by all connected secondary capacitors and fixed inductors to suppress interference frequencies.

[0033] Circuit description of the device of the present invention.

[0034] The duplexer 1 is composed of a radio frequency transformer with a balanced network and a peripheral matching circuit.

[0035] The first frequency hopping notch filter 2 and the second frequency hopping notch filter 5 use double-tuned band-stop filters, which are composed of high-Q binary capacitors with high voltage resistance, loop inductors, PIN diodes, etc. The binary capacitors are high-Q capacitors from ATC, with a rated voltage of +300V and an accuracy of 1%. The PIN diodes are MA4P7446F-1091T from MACOM, with a reverse breakdown voltage greater than +500V.

[0036] The RF amplifiers 3 and 15 are composed of the RF integrated circuit PSA4-5043+ and its peripheral inductors and capacitors. The PSA4-5043+ is a low-noise, wide-band RF amplifier with an operating frequency range of 50 MHz to 4 GHz, a gain greater than 14 dB, a noise figure of 1.0 dB, and an output power 1 dB compression point of 19.4 dBm.

[0037] The first frequency hopping filter 4, the second frequency hopping filter 7, the third frequency hopping filter 16, the fourth frequency hopping filter 18 and the co-site filter 22 all adopt double-tuned bandpass filters. The bandpass filters are composed of high-Q binary capacitors with high voltage resistance, loop inductors, PIN diodes, etc. The binary capacitors are high-Q capacitors from ATC Company with an accuracy of 1%. The rated voltage of the binary capacitors of the frequency hopping filter is +150V, and the rated voltage of the binary capacitors of the co-site filter is +400V; the PIN diode is MA4P7446F-1091T from MACOM Company, and the reverse breakdown voltage is greater than +500V.

[0038] RF amplifiers 6, 8, and 17 are composed of a RF integrated circuit PHA-13LN+ and its peripheral inductors and capacitors. PHA-13LN+ is a low-noise, high-linearity RF amplifier with an operating frequency range of 1 MHz to 1 GHz, a noise figure of 0.9 dB, and an output power 1 dB compression point of 28.7 dBm.

[0039] The bandpass filter 9 is composed of an LC Chebyshev filter and is used to filter out clutter signals outside the working frequency band.

[0040] The analog-to-digital converter 10 is composed of AD9689 and peripheral circuits of AD Company. AD9689 is a dual-channel, 14-bit, 2.0 / 2.6 GSPS analog-to-digital converter that can directly sample wide-bandwidth analog signals up to 5 GHz.

[0041] Standard frequency 11 uses a temperature compensated crystal oscillator circuit with a frequency of 57.6MHz, a power supply of 5V±0.3V, an output sine wave, a temperature stability of ±0.5ppm@-40~85℃, a single-sideband phase noise of ≤-120dBc / Hz@100Hz, ≤-140dBc / Hz@1kHz, ≤-150dBc / Hz@10kHz, and the voltage control terminal Vc of the temperature compensated crystal oscillator can control the accuracy of the output frequency by adjusting the voltage.

[0042] The channel controller 12 is composed of Xilinx's XC3S400-4FG320I FPGA chip and peripheral resistors and capacitors. The FPGA receives the channel status and receiving and transmitting frequency information sent by the baseband processor 13, calculates the configuration parameters according to the received frequency value, and then controls the frequency hopping filter, frequency hopping notch, and the receiving and transmitting status and power amplifier at the same time.

[0043] The baseband processor 13 is composed of a ZYNQ 7030 FPGA chip from Xilinx and peripheral resistors and capacitors. ZYNQ7030 is a programmable SOC chip from Xilinx that integrates a dual-core ARM cortex-A9 processor and FPGA logic resources to complete modulation and demodulation, baseband data processing, channel control, etc.

[0044] The digital-to-analog converter 14 is composed of AD9172 and peripheral circuits of AD Company. AD9172 is a high-linearity dual-channel digital-to-analog converter supporting a DAC sampling rate of 12.6 GSPS and supporting single-band and multi-band wireless applications.

[0045] The driver amplifier 19 and the power amplifier 20 are composed of two-stage GaN transistors and input and output matching circuits. The driver amplifier 19 uses the gallium nitride tube NPTB00004 of MACOM, with an operating frequency range of DC to 6GHz, an output power of 5W, and a signal gain of 16dB. The power amplifier 20 uses the gallium nitride tube NPTB00025A of MACOM, with an operating frequency range of DC to 4GHz, an output power of 25W, a signal gain of 13.5dB, and high efficiency.

[0046] The power amplifier detection circuit 21 is composed of a directional coupler realized by an RF coupling cable and AD's AD8361 forward and reverse power sampling circuit. The operating frequency range of AD8361 is LF~2.5GHz. AD8361 can convert the collected RF power signal into a corresponding DC voltage, and then output it to the digital unit after amplification by an operational amplifier. The collected power information is used to perform power control and protection control of the radio station.

[0047] The power manager 23 is composed of a DC-DC conversion circuit, a synchronization circuit, a linear power supply and peripheral circuits. The power input terminal is connected to a filter. The power supply has surge, overvoltage, overcurrent, reverse connection and other protection functions. The DC-DC conversion circuit converts the input DC voltage into five voltages of +100V, +200V, +5.5V and -3.6V. The linear power supply converts the external input voltage into +5V, +3.3V, +1.8V as the power supply voltage for circuits such as standard frequency, RF amplifier, controller, baseband processor, ADC and DAC chip. The voltages of analog circuits and digital circuits are isolated by linear regulators and filter circuits to reduce crosstalk between modules.

[0048] Compared with the related art, the present invention provides a fast frequency agile full-duplex communication device in the same frequency band, which has the following beneficial effects: The present invention provides a full-duplex communication device with fast and agile frequency change and the same frequency band. The full-duplex communication device has an operating frequency covering 100MHz to 1GHz, a wide frequency range, high communication efficiency, and low delay, and can effectively suppress the self-interference generated by a local transmitter, and can meet the application of a full-duplex communication system in a wide frequency band and the same frequency band with high-speed frequency hopping. The system duplexer has a transceiver isolation greater than 30dBc, a receiving path notch suppression capability greater than 65dBc, and a frequency hopping filter out-of-band suppression capability greater than 20dBc. Therefore, the system has a suppression capability of greater than 115dBc for transmitting interference signals, and realizes a good suppression capability of the receiving path for transmitting interference signals, ensuring normal full-duplex communication in the same frequency band. The full-duplex communication device is very suitable for the application environment of a high-performance full-duplex communication system, and can be applied to a full-duplex communication system in any frequency band by selecting a corresponding frequency hopping notch filter, a frequency hopping filter, and an amplifier. The full-duplex communication device has the advantages of high spectrum utilization and communication efficiency, a wide frequency range, strong self-interference suppression capability, and good frequency hopping anti-interference performance.

[0049] Second embodiment

[0050] Please refer to Figure 3 , Figure 4 and Figure 5 Based on a frequency-agile and simultaneous full-duplex communication device in the same frequency band provided by the first embodiment of the present application, the second embodiment of the present application proposes another frequency-agile and simultaneous full-duplex communication device in the same frequency band. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0051] Specifically, the difference of the second embodiment of the present application in a simultaneous same-frequency band full-duplex communication device with rapid frequency agility is that, in a simultaneous same-frequency band full-duplex communication device with rapid frequency agility, a disassembly component 24 is provided on the surface of the duplexer 1, and the disassembly component 24 includes a disassembly cover 241, a plurality of L-shaped connecting blocks 242, a plurality of mounting blocks 243, two mounting grooves 244 and two fixing bolts 245, the plurality of L-shaped connecting blocks 242 are respectively connected to the two sides of the disassembly cover 241, the plurality of mounting blocks 243 are respectively connected to one end of the plurality of L-shaped connecting blocks 242, and the two mounting grooves 244 are respectively opened on both sides of the surface of the duplexer 1.

[0052] The two fixing bolts 245 are respectively disposed between two of the mounting blocks 243 and the duplexer 1 .

[0053] A fixing hole matched with the fixing bolt 245 is opened on the rear inner wall of the installation groove 244 . The disassembly cover 241 is U-shaped and sleeved on the surface of the duplexer 1 .

[0054] The working principle of the full-duplex communication device with fast frequency agility and the same frequency band provided by the present invention is as follows: When in use, when inspecting the components inside the duplexer 1, first remove the fixing bolt 245 between the mounting block 243 and the duplexer 1, and then pull the disassembly cover 241 to use multiple L-shaped connecting blocks 242 to drive the mounting block 243 to separate from the mounting groove 244.

[0055] Compared with the related art, the present invention provides a fast frequency agile full-duplex communication device in the same frequency band, which has the following beneficial effects: The present invention provides a full-duplex communication device with rapid frequency agility and the same frequency band. A disassembly cover 241, a plurality of L-shaped connecting blocks 242, a plurality of mounting blocks 243, two mounting grooves 244 and two fixing bolts 245 are arranged on the surface of the duplexer 1. When the duplexer 1 fails after long-term use, the disassembly cover 241 can be conveniently disassembled to inspect and repair the components inside the duplexer 1.

[0056] A method for a full-duplex communication device with a same frequency band and a fast frequency agile change, used for the full-duplex communication device with a fast frequency agile change and a same frequency band, comprises the following steps: S1, the radio frequency signal received by the antenna passes through the unidirectional characteristic of the duplexer 1, and the receiving signal enters the receiving channel, and first passes through the first frequency hopping notch filter 2 to suppress the transmitting interference signal coupled from the transmitting channel, and the useful receiving signal and the interference signal are amplified by the first radio frequency amplifier 3, and then the first frequency hopping filter 4 selects the useful signal, and the transmitting interference signal is filtered and attenuated, and then passes through the second frequency hopping notch filter 5 to further suppress the transmitting interference signal, and the useful signal and the transmitting interference signal are amplified by the second radio frequency amplifier 6, and then the second frequency hopping filter 7 selects the useful signal, and the transmitting interference signal is further filtered and attenuated, and finally amplified by the third radio frequency amplifier 8 and the bandpass filter 9 to send it to the analog-to-digital converter 10. The frequency hopping notch filter in the receiving path has a great inhibitory and attenuation effect on the transmitting interference signal, and the frequency hopping filter in the path also has a certain attenuation suppression ability for the transmitting interference signal. Although multiple stages of amplification are designed in the channel, it is still ensured that the transmitting interference signal in the path is greatly attenuated, and the useful signal is selected and amplified to meet the subsequent digitization of the analog-to-digital converter 10 and the demodulation and decoding processing of the baseband processor 13; S2, the transmitting digital signal is coded and modulated by the baseband processor 13 to become a modulated baseband signal, and sent to the transmitting channel digital-to-analog converter 14 to be converted into a radio frequency signal. The radio frequency signal is amplified by the fourth radio frequency amplifier 15, and the third frequency hopping filter 16 is frequency-selective filtered. The fifth radio frequency amplifier 17 and the fourth frequency hopping filter 18 are further amplified and frequency-selective filtered. Then, the radio frequency signal is cascaded and amplified to the required power by the excitation amplifier 19 and the power amplifier 20. The transmitter power is processed and controlled by the power amplifier detection circuit 21 and the channel controller 12. The radio frequency power signal is further frequency-selectively filtered by the co-site filter 22 to suppress harmonics, out-of-band spurious and noise. After that, the signal is transmitted from the antenna through the unidirectional characteristic of the duplexer 1. S3, the reference frequency 11 generates a reference frequency of 57.6 MHz, which is sent to the analog-to-digital converter, the analog-to-digital converter 14, the channel controller 12, and the baseband processor 13 as the working clock of each module; S4. The channel controller 12 inputs the control frequency word, clock, enable signal and control signal to the first frequency hopping notch filter 2, the second frequency hopping notch filter 5, the first frequency hopping filter 4, the second frequency hopping filter 7, the third frequency hopping filter 16, the fourth frequency hopping filter 18 and the co-address filter 22 according to the operating frequency of the transceiver channel.

[0057] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A full-duplex communication device with fast frequency agility and the same frequency band, characterized in that: include: A duplexer, a first frequency hopping notch filter, a first RF amplifier, a first frequency hopping filter, a second frequency hopping notch filter, a second RF amplifier, a second frequency hopping filter, a third RF amplifier, a bandpass filter, an analog-to-digital converter, a standard frequency, a channel controller, a baseband processor, a digital-to-analog converter, a fourth RF amplifier, a third frequency hopping filter, a fifth RF amplifier, a fourth frequency hopping filter, an excitation amplifier, a power amplifier, a power amplifier detection circuit, a co-site filter, and a power management; The duplexer input end is connected to the co-site filter, the output end is connected to the signal input end of the first frequency hopping notch filter, the signal output end of the first frequency hopping notch filter is connected to the signal input end of the first radio frequency amplifier, the signal output end of the first radio frequency amplifier is connected to the signal input end of the first frequency hopping filter, the signal output end of the first frequency hopping filter is connected to the signal input end of the second frequency hopping notch filter, and the signal output end of the second frequency hopping notch filter is connected to the signal input end of the second radio frequency amplifier; The signal output end of the second RF amplifier is connected to the signal input end of the second frequency hopping filter, the signal output end of the second frequency hopping filter is connected to the signal input end of the third RF amplifier, and the signal output end of the third RF amplifier is connected to the signal input end of the bandpass filter; The signal output end of the bandpass filter is connected to the signal input end of the analog-to-digital converter, and the RF digital signal output end of the analog-to-digital converter is connected to the signal input end of the baseband processor; The RF digital signal output end of the baseband processor is connected to the signal input end of the digital-to-analog converter, the control signal output end of the baseband processor is connected to the control signal input end of the channel controller, the signal output end of the digital-to-analog converter is connected to the signal input end of the fourth RF amplifier, the signal output end of the fourth RF amplifier is connected to the signal input end of the third frequency hopping filter, the signal output end of the third frequency hopping filter is connected to the signal input end of the fifth RF amplifier, the signal output end of the fifth RF amplifier is connected to the signal input end of the fourth frequency hopping filter, the signal output end of the fourth frequency hopping filter is connected to the signal input end of the excitation amplifier, the signal output end of the excitation amplifier is connected to the signal input end of the power amplifier, the signal output end of the power amplifier is connected to the signal input end of the power amplifier detection circuit, and the signal output end of the power amplifier detection circuit is connected to the signal input end of the co-address filter.

2. The frequency-agile and simultaneous full-duplex communication device of claim 1, characterized in that: The first frequency hopping filter and the second frequency hopping filter are used to receive the frequency control signal output by the channel controller, track and tune the selected received useful radio frequency signal, and filter out out-of-band interference.

3. The frequency-agile full-duplex communication device with the same frequency band and fast frequency change according to claim 1, characterized in that: The first frequency hopping notch filter and the second frequency hopping notch filter are used to receive the frequency control signal output by the channel controller, and form a band-stop filter to suppress the radio frequency signal of the transmitter itself from entering the receiving channel, thereby reducing interference to the receiving path.

4. The frequency-agile full-duplex communication device with the same frequency band and fast frequency change according to claim 1, characterized in that: The first RF amplifier, the second RF amplifier and the third RF amplifier are used to amplify the weak RF signal received by the receiver antenna so that the RF signal amplitude and signal-to-noise ratio meet the requirements of the analog-to-digital converter for RF digitization.

5. The frequency-agile full-duplex communication device with the same frequency band and fast frequency change according to claim 1, characterized in that: The bandpass filter is used to filter out interference and noise outside the working frequency band.

6. The frequency-agile and simultaneous full-duplex communication device of claim 1, characterized in that: The analog-to-digital converter is used to digitize the received radio frequency analog signal, and the digital-to-analog converter is used to convert the transmitted baseband digital signal into a radio frequency signal.

7. The frequency-agile and simultaneous full-duplex communication device of claim 1, characterized in that: The fourth RF amplifier and the fifth RF amplifier are used to amplify the small RF signal emitted by the receiver digital-to-analog converter to drive the subsequent amplification circuit.

8. The frequency-agile and simultaneous full-duplex communication device of claim 1, characterized in that: A disassembly component is provided on the surface of the duplexer, and the disassembly component includes a disassembly cover, a plurality of L-shaped connecting blocks, a plurality of mounting blocks, two mounting grooves and two fixing bolts, the plurality of L-shaped connecting blocks are respectively connected to both sides of the disassembly cover, the plurality of mounting blocks are respectively connected to one end of the plurality of L-shaped connecting blocks, and the two mounting grooves are respectively opened on both sides of the surface of the duplexer.

9. The frequency-agile and simultaneous full-duplex communication device of claim 8, characterized in that: The two fixing bolts are respectively arranged between two of the mounting blocks and the duplexer.

10. A method for a frequency-agile full-duplex communication device with the same frequency band at the same time, used for using a frequency-agile full-duplex communication device with the same frequency band at the same time as claimed in claims 1 to 7, characterized in that: The following steps are involved: S1. The RF signal received by the antenna passes through the unidirectional characteristics of the duplexer, and the receiving signal enters the receiving channel. First, it passes through the first frequency hopping notch filter to suppress the transmitting interference signal coupled from the transmitting channel. The useful receiving signal and the interference signal are amplified by the first RF amplifier, and then the first frequency hopping filter selects the useful signal, and the transmitting interference signal is filtered and attenuated. Then, the second frequency hopping notch filter is used to further suppress the transmitting interference signal. The useful signal and the transmitting interference signal are amplified by the second RF amplifier, and then the second frequency hopping filter selects the useful signal, and the transmitting interference signal is further filtered and attenuated. Finally, it is amplified by the third RF amplifier and sent to the analog-to-digital converter through a bandpass filter. The frequency hopping notch filter in the receiving channel has a great inhibitory and attenuating effect on the transmitting interference signal. At the same time, the frequency hopping filter in the channel also has a certain attenuation suppression ability for the transmitting interference signal. Although multiple stages of amplification are designed in the channel, it is still ensured that the transmitting interference signal in the channel is greatly attenuated, and the useful signal is selected and amplified to meet the subsequent digitization of the analog-to-digital converter and the demodulation and decoding processing of the baseband processor; S2, the transmitted digital signal is coded and modulated by the baseband processor to become a modulated baseband signal, and then sent to the transmission channel digital-to-analog converter to be converted into a radio frequency signal. The radio frequency signal is amplified by the fourth radio frequency amplifier, frequency-selective filtered by the third frequency hopping filter, further amplified and frequency-selective filtered by the fifth radio frequency amplifier and the fourth frequency hopping filter, and then amplified to the required power by the excitation amplifier and the power amplifier cascade, and the transmitter power is controlled by the power amplifier detection circuit and the channel controller. The radio frequency power signal is further frequency-selective filtered by the co-location filter to suppress harmonics, out-of-band spurious and noise, and then the signal is transmitted from the antenna through the unidirectional characteristics of the duplexer; S3, the standard frequency generates a reference frequency of 57.6MHz, which is sent to the analog-to-digital converter, analog-to-digital converter, channel controller, and baseband processor as the working clock of each module; S4. The channel controller sends control frequency words, clocks, enable signals and control signals to the first frequency hopping notch filter, the second frequency hopping notch filter, the first frequency hopping filter, the second frequency hopping filter, the third frequency hopping filter, the fourth frequency hopping filter and the co-site filter according to the operating frequency of the transceiver channel.

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