Signal processing method and system

Abstract

The embodiment of the invention discloses a signal processing method and system. The method is applied to a transmitting end, and comprises the following steps: acquiring a baseband signal to be transmitted, and determining a filter bandwidth of a channel where the baseband signal is located; determining the bandwidth of the pseudo-random sequence generated by the pseudo-random sequence generator based on the filter bandwidth; performing spread spectrum processing on the baseband signal based on the bandwidth of the pseudo-random sequence, and transmitting the radio frequency signal after the spread spectrum processing; wherein the bandwidth of the radio frequency signal after the spread spectrum processing is equal to the bandwidth of the filter. According to the technical scheme, the bandwidth of the pseudo-random sequence generated by the pseudo-random sequence generator can be determined through the bandwidth of the filter, and spectrum spreading processing is carried out on the baseband signal through the bandwidth of the pseudo-random sequence, so that the bandwidth of the baseband signal is expanded to be the same as the bandwidth of the filter; therefore, all useful signals of the baseband signals can pass through the filter, and useless out-of-band signals are just out of the band of the filter and can be filtered out, so that the signals can be better filtered.

Description

Technical Field

[0001] This invention relates to the field of signal processing technology, and more particularly to a signal processing method and system. Background Technology

[0002] Existing communication equipment uses digital filtering to suppress sideband clutter. Signal processing filtering generally uses two methods: one is to generate a signal opposite to the interference and subtract it to remove the interference. The drawback of this method is that while removing the interference, the useful signal is also attenuated, resulting in distortion of the useful signal after filtering. The other method is to use digital filtering, which also has the problem that the amplitude of the corresponding signal at the corresponding frequency point differs from the original signal after filtering, and it also causes a large delay. Summary of the Invention

[0003] In view of this, the present invention provides a signal processing method and system that enables useful baseband signals to pass through the filter, while useless out-of-band signals, which are exactly outside the filter's band, will be filtered out, thereby achieving better signal filtering.

[0004] According to one aspect of the present invention, an embodiment of the present invention provides a signal processing method applied at a transmitting end, the method comprising:

[0005] Acquire the baseband signal to be transmitted and determine the filter bandwidth of the channel in which the baseband signal is located;

[0006] The bandwidth of the pseudo-random sequence generator for generating pseudo-random sequences is determined based on the filter bandwidth.

[0007] The baseband signal is spread based on the bandwidth of the pseudo-random sequence, and the spread-processed radio frequency signal is transmitted; wherein the bandwidth of the spread-processed radio frequency signal is equal to the bandwidth of the filter.

[0008] According to another aspect of the present invention, embodiments of the present invention also provide a signal processing method applied at a receiving end, the method comprising:

[0009] The radio frequency signal is received and demodulated to obtain a demodulated signal; wherein the demodulated signal is a baseband signal superimposed with a pseudo-random sequence with a specific bandwidth.

[0010] The baseband signal is obtained from the demodulated signal.

[0011] According to another aspect of the present invention, embodiments of the present invention also provide a signal processing system, the system comprising a transmitter and a receiver;

[0012] The transmitting end is used to execute the signal processing method described in any embodiment of the present invention;

[0013] The receiving end is used to execute the signal processing method described in any embodiment of the present invention.

[0014] The above-described technical solution of this invention determines the filter bandwidth of the channel where the baseband signal is located. Based on this, the bandwidth for generating a pseudo-random sequence is determined using the filter bandwidth. The bandwidth of the pseudo-random sequence is then used to spread the baseband signal, and the spread-spectrum radio frequency signal is transmitted. This expands the bandwidth of the baseband signal to be the same as the filter bandwidth, so that useful signals of the baseband signal can pass through the filter, while useless out-of-band signals, which are exactly outside the filter's band, will be filtered out, thus achieving better signal filtering.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart of a signal processing method provided in an embodiment of the present invention;

[0018] Figure 2 A flowchart illustrating another signal processing method provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of an architecture for testing the filter bandwidth of a channel using a single-tone signal, provided as an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of a process for testing the filter bandwidth of a channel using a single-tone signal, as provided in an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the spread spectrum processing of a baseband signal to be transmitted at a transmitter, according to an embodiment of the present invention.

[0022] Figure 6 A flowchart illustrating another signal processing method provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a process for a receiver to receive radio frequency signals and demodulate baseband data streams according to an embodiment of the present invention.

[0024] Figure 8 This is a structural block diagram of a signal processing system provided in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of a transmitter structure provided in an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of a receiving end provided in an embodiment of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] In one embodiment, Figure 1 This is a flowchart illustrating a signal processing method according to an embodiment of the present invention. This embodiment is applicable to situations involving signal processing of clutter signals. Figure 1 As shown, this method, applied to the transmitting end, specifically includes the following steps:

[0030] S110. Obtain the baseband signal to be transmitted and determine the filter bandwidth of the channel where the baseband signal is located.

[0031] The baseband signal, also known as the baseband data stream, can be understood as an unmodulated, raw, low-frequency signal sequence. The filter bandwidth can be understood as the bandwidth of the radio frequency filter during signal transmission; this bandwidth can be the effective frequency range within which the channel allows the signal to pass without distortion.

[0032] In this embodiment, the filter bandwidth of the channel where the baseband signal is located can be obtained in various ways. In some embodiments, it can be determined by relevant standard protocols (e.g., 3GPP standard protocols). This can be understood as first determining the frequency band used by the RF filter, and then determining the filter bandwidth according to the frequency band specified in the standard protocol. That is, the frequency band specified by the protocol can be directly used as the corresponding filter bandwidth. In other embodiments, if the frequency band used by the RF filter is unknown, the filter bandwidth of the channel can be tested by setting a corresponding single-tone signal. This is because the single-tone signal can change continuously with frequency, so the suppression of the filter on the corresponding frequency point of the single-tone signal can be determined, and thus the filter bandwidth of the channel can be obtained. Of course, in addition to the above methods, other methods can also be used to determine the filter bandwidth of the channel. This embodiment does not impose specific limitations here.

[0033] It should be noted that before determining the filter bandwidth of the channel where the baseband signal is located, it is also necessary to determine whether the baseband signal needs to be suppressed by the adjacent channel leakage ratio. The adjacent channel leakage ratio can measure the degree of interference of the transmitter to the adjacent channel. If the adjacent channel leakage ratio does not need to be suppressed, the normal channel transmission process is directly executed. If the adjacent channel leakage ratio needs to be suppressed, the filter bandwidth of the channel where the baseband signal is located needs to be determined in order to perform subsequent spread spectrum processing of the baseband signal.

[0034] S120. Determine the bandwidth of the pseudo-random sequence generator to produce the pseudo-random sequence based on the filter bandwidth.

[0035] A pseudo-random sequence generator can produce pseudo-random sequences according to given rules. A pseudo-random sequence can be understood as a deterministic sequence with random characteristics.

[0036] In this embodiment, the bandwidth of the pseudo-random sequence generator to generate the pseudo-random sequence can be obtained by determining the filter bandwidth of the channel. In some embodiments, after obtaining the filter bandwidth of the channel, a corresponding protection channel can be set according to the filter bandwidth. This can be understood as setting the bandwidth of the pseudo-random sequence to be equal to the filter bandwidth, that is, the filter bandwidth and the bandwidth of the pseudo-random sequence are equal bandwidth, so as to perform subsequent baseband signal spread spectrum processing.

[0037] S130. The baseband signal is spread based on the bandwidth of the pseudo-random sequence, and the spread-processed radio frequency signal is transmitted; wherein the bandwidth of the spread-processed radio frequency signal is equal to the bandwidth of the filter.

[0038] In this embodiment, the bandwidth of the pseudo-random sequence and the baseband signal are respectively input to the multiplier in the transmitter. The multiplier can output the processed signal, the bandwidth of which is equal to the bandwidth of the filter. In this embodiment, after the bandwidth of the pseudo-random sequence and the baseband signal are multiplied, the bandwidth of the channel is spread to the entire bandwidth of the filter by the pseudo-random sequence. At this time, the channel occupies the entire band, and the neighboring channel leakage signal of the filter is outside the filter band and can be filtered by the filter, forming better neighboring channel suppression characteristics and avoiding the impact on the signal receiving sensitivity and other parameters.

[0039] In this embodiment, the processed signal after multiplying the bandwidth of the pseudo-random sequence and the baseband signal is input to the radio frequency transmitter at the transmitting end for corresponding signal modulation, and then the modulated signal is output. Similarly, the bandwidth of the modulated signal is equal to the bandwidth of the filter, and the modulated signal is transmitted through the radio frequency front-end component.

[0040] The above-described technical solution of this invention determines the filter bandwidth of the channel where the baseband signal is located. Based on this, the bandwidth for generating a pseudo-random sequence is determined using the filter bandwidth. The bandwidth of the pseudo-random sequence is then used to spread the baseband signal, and the spread-spectrum radio frequency signal is transmitted. This expands the bandwidth of the baseband signal to be the same as the filter bandwidth, so that useful signals of the baseband signal can pass through the filter, while useless out-of-band signals, which are exactly outside the filter's band, will be filtered out, thus achieving better signal filtering.

[0041] In one embodiment, Figure 2 This is a flowchart of another signal processing method provided by an embodiment of the present invention. Based on the above embodiments, this embodiment further refines the following steps: determining the filter bandwidth of the channel where the baseband signal is located; determining the bandwidth of the pseudo-random sequence generator to generate a pseudo-random sequence based on the filter bandwidth; spreading the baseband signal based on the bandwidth of the pseudo-random sequence; and transmitting the spread-spectrum radio frequency signal.

[0042] like Figure 2 As shown, the signal processing method in this embodiment may specifically include the following steps:

[0043] S210: Acquire the baseband signal to be transmitted.

[0044] S220. Determine the filter bandwidth of the channel according to the preset standard protocol.

[0045] The default standard protocol is the 3GPP protocol of the communication field as recorded in the prior art.

[0046] In this embodiment, if the frequency band used by the filter is known, then the frequency band used by the filter as required by the protocol is the bandwidth of the filter. For example, the frequency band corresponds to LTE band1, which corresponds to a frequency range, i.e., the filter bandwidth of the channel. Then, the bandwidth of the pseudo-random sequence can be set according to the filter bandwidth of the channel.

[0047] S230. Generate a single-tone signal using a single-tone signal generator, and use the single-tone signal to test the filter bandwidth of the channel.

[0048] Among them, a single-tone signal generator can be a device that generates a single-tone signal, which is a signal with a single frequency.

[0049] In this embodiment, the single-tone signal includes at least two first single-tone signals. Several single-tone signals can be generated by a single-tone signal generator, and the generated single-tone signals are processed accordingly using an adder, an RF transceiver, and a coupler to test the filter bandwidth of the channel. Specifically, a single-tone signal is generated by a single-tone signal generator, processed by an adder to obtain a processed single-tone signal, and modulated by an RF transmitter to obtain a modulated signal. Then, the first single-tone RF signal strength of the modulated signal is obtained by setting a first coupler, and the second single-tone RF signal strength is obtained by setting a second coupler. Based on the first and second single-tone RF signal strengths, the signal strength detection module in the RF transmitter determines the suppression level of the RF filter on the corresponding frequency point of the single-tone signal, and determines the filter bandwidth based on the suppression level.

[0050] In one embodiment, the monotone signal includes at least two first monotone signals. Accordingly, generating the monotone signal via a monotone signal generator and using the monotone signal to test the filter bandwidth of the channel includes:

[0051] The first single-tone signal around the center frequency of the frequency band in which the channel is located is generated by a single-tone signal generator;

[0052] The first monotone signal is processed by an adder to obtain the second monotone signal, and the second monotone signal is transmitted to the radio frequency transmitter.

[0053] The first single-tone radio frequency signal is obtained by modulating the second single-tone signal with a radio frequency transmitter;

[0054] The first single-tone radio frequency signal is processed by the first coupler to obtain the strength of the first single-tone radio frequency signal, and the strength of the first single-tone radio frequency signal is fed back to the signal strength detection module in the radio frequency transmitter.

[0055] The first monotone radio frequency signal is processed by the radio frequency front-end component to obtain the processed second monotone radio frequency signal.

[0056] The second single-tone radio frequency signal is processed by the second coupler to obtain the strength of the second single-tone radio frequency signal, and the strength of the second single-tone radio frequency signal is fed back to the signal strength detection module in the radio frequency transmitter.

[0057] The signal strength detection module determines the suppression of the radio frequency filter on the corresponding frequency point of the single-tone signal based on the strength of the first single-tone radio frequency signal and the strength of the second single-tone radio frequency signal, and determines the filter bandwidth based on the suppression.

[0058] The first monotone signal consists of multiple monotone signals generated by the monotone signal generator, representing the initial monotone signal. The second monotone signal is the monotone signal processed by the adder. The intensity of the first monotone RF signal is the intensity of the monotone signal before filtering; the intensity of the second monotone RF signal is the intensity of the monotone signal after amplification and filtering.

[0059] In this embodiment, a single-tone signal generator generates a first single-tone signal around the center frequency point of the channel's frequency band. The first single-tone signal is processed to obtain a second single-tone signal. An RF transmitter modulates the second single-tone signal to obtain a first single-tone RF signal. Since the first coupler is positioned before the RF front-end assembly and connected to the signal detection module, the strength of the first single-tone RF signal obtained by the first coupler is the single-tone signal strength without a filter. After obtaining the first single-tone RF signal strength, it is fed back to the signal strength detection module in the RF transmitter. The second coupler is positioned after the RF front-end assembly, which includes a filter, amplifier, and RF switching device. Similarly, the second coupler is also connected to the signal detection module. Therefore, the second single-tone RF signal is the single-tone signal strength after passing through an RF signal amplifier and filter. Likewise, the second single-tone RF signal strength is fed back to the signal strength detection module in the RF transmitter. The signal strength detection module determines the suppression level of the RF filter on the corresponding frequency point of the single-tone signal based on the first and second single-tone RF signal strengths, and determines the filter bandwidth based on the suppression level. More specifically, the difference between the strength of the first single-tone RF signal and the strength of the second single-tone RF signal can be determined. This difference can characterize the influence of each device in the RF front-end assembly on the amplitude of the single-tone signal. In this embodiment, since there is no additional attenuation of the signal amplitude at the center frequency of the channel's frequency band, the suppression of the corresponding frequency point of the single-tone signal by the filter can be determined. Therefore, based on the suppression of the frequency point, the bandwidth range parameter required for pseudo-random sequence spreading can be obtained. This can be understood as setting the bandwidth of the pseudo-random sequence according to the filter bandwidth of the channel, and then spreading the subsequent baseband signal, thus maximizing the utilization of the filter bandwidth.

[0060] For example, to better understand the process of testing the filter bandwidth of a channel using a single-tone signal, Figure 3 This is a schematic diagram of an architecture for testing the filter bandwidth of a channel using a single-tone signal, according to an embodiment of the present invention. Figure 4 This is a schematic flowchart illustrating a method for testing the filter bandwidth of a channel using a single-tone signal, as provided in an embodiment of the present invention. It should be noted that... Figure 3The operations preceding and following the multiplier have a specific time sequence. This can be understood as follows: First, a single-tone signal is generated by a single-tone generator. Then, the filter bandwidth of the channel is determined by subsequent adders, RF transceivers, a first coupler, RF front-end components, a second coupler, and a signal strength detection module. Next, a pseudo-random sequence with the same bandwidth as the filter bandwidth is set (i.e., the pseudo-random sequence generated by the pseudo-random sequence generator has the same bandwidth as the filter bandwidth). The baseband data stream is then multiplied by this pseudo-random sequence (multiplication). The processed signal output by the multiplier is then processed by the RF transmitter and RF front-end components before being transmitted. It should be noted that during the subsequent process of transmitting the processed signal output by the multiplier through the RF transmitter and RF front-end components, only the RF transceiver and RF front-end components are operational.

[0061] It should be noted that after generating several single-tone signals through the single-tone signal generator, in addition to processing these signals using an adder, a single-pole double-throw switch can be used to replace the adder. This can be understood as follows: when determining the filter bandwidth in the early stages, the single-pole double-throw switch should be in the open state, meaning the adder and the preceding multiplier are disconnected. After determining the filter bandwidth, the single-pole double-throw switch should be in the connected state, meaning the adder and the preceding multiplier are connected. This allows the several single-tone signals to be processed by the subsequent RF transceiver, the first coupler, the RF front-end components, the second coupler, and the signal strength detection module to determine the filter bandwidth of the channel, thereby determining the subsequent pseudo-random sequence bandwidth and the baseband signal spread spectrum processing. This process has been described in the above embodiments and will not be specifically described here.

[0062] like Figure 3As shown, before the baseband data stream (i.e., the baseband signal in the above embodiment) is transmitted to the multiplier, the filter bandwidth of the channel is first tested using a single-tone signal. This determines the filter bandwidth of the channel where the baseband signal is located. Then, the filter bandwidth determines the bandwidth of the pseudo-random sequence generator to produce the pseudo-random sequence. This allows the pseudo-random sequence controller to control the pseudo-random sequence generator to produce a pseudo-random sequence with the same bandwidth as the filter. The pseudo-random sequence with the same bandwidth and the baseband data stream are then input into the multiplier to perform a spread spectrum operation on the baseband data stream. The spread new baseband data stream is then transmitted. It can be understood that after the pseudo-random sequence and the baseband data stream are multiplied, the bandwidth of this new baseband data stream is equal to the bandwidth of the filter. After being modulated to the corresponding RF bandwidth by the RF transceiver, it can be transmitted through the antenna via the RF front-end device. In this way, by spreading, the bandwidth of the RF signal is expanded to be the same as the bandwidth of the filter. Thus, the useful signals of the RF signal can pass through the filter, while the useless out-of-band signals, which are exactly outside the filter's band, will be filtered out.

[0063] Specifically, the process of testing the filter bandwidth of a channel using a single-tone signal can include: after the single-tone signal is converted into an RF signal by the RF transceiver, it passes through a first coupler to obtain the single-tone signal strength without the filter. Then, it is coupled through a second coupler to obtain the single-tone signal strength after passing through the RF signal amplifier and filter. The difference between these two signal strengths represents the impact of the filters, amplifiers, RF switches, etc., included in the RF front-end devices on the single-tone signal amplitude. Since there is no additional attenuation of the signal amplitude at the center frequency of the frequency band by default, the suppression effect of the filter on the corresponding frequency of the single-tone signal can be determined. In this way, based on the current suppression situation, we can obtain the bandwidth range parameters required for pseudo-random sequence spread spectrum, thereby maximizing the filling of the filter bandwidth, achieving the best noise suppression characteristics, and determining which frequency point to set as the center frequency. This allows us to obtain skewed suppression characteristics on both the left and right sides of the adjacent channel leakage ratio. We can suppress more on the left, more on the right, or have similar suppression characteristics on both sides. All we need to do is shift the center frequency to a lower or higher frequency. Shifting the center frequency to a lower frequency results in greater suppression of the adjacent channel leakage ratio at the high frequency, while shifting the center frequency to a higher frequency results in greater suppression of the adjacent channel leakage ratio at the low frequency. Therefore, we can obtain the desired suppression for a specific frequency point.

[0064] like Figure 4 As shown, the specific process of testing the filter bandwidth of a channel using a single-tone signal can include:

[0065] a1. Check if the filter bandwidth is checked. If yes, execute a3; otherwise, execute a2.

[0066] a2. Normal channel transmission / reception process.

[0067] In this embodiment, the normal channel reception process is the reception process that does not require baseband signal spread spectrum.

[0068] a3. The single-tone signal generator emits single-tone signals around the center frequency of the frequency band.

[0069] a4. The adder and the radio frequency transmitter process the single-tone signal to obtain the first single-tone radio frequency signal.

[0070] a5. The first coupler processes the first single-tone radio frequency signal to obtain the first single-tone radio frequency signal strength, and feeds back the first single-tone radio frequency signal strength to the signal strength detection module in the radio frequency transmitter.

[0071] a6. The radio frequency front-end component performs signal processing on the first single-tone radio frequency signal to obtain the processed second single-tone radio frequency signal.

[0072] a7. The second coupler processes the second single-tone radio frequency signal to obtain the second single-tone radio frequency signal strength, and feeds back the second single-tone radio frequency signal strength to the signal strength detection module in the radio frequency transmitter; wherein, the second single-tone radio frequency signal strength is the single-tone signal strength after amplification and filtering.

[0073] a8. The signal strength detection module determines the suppression of the radio frequency filter on the corresponding frequency point of the single-tone signal based on the strength of the first single-tone radio frequency signal and the strength of the second single-tone radio frequency signal, and determines the filter bandwidth based on the suppression.

[0074] S240. Set the bandwidth of the pseudo-random sequence to be equal to the bandwidth of the filter, according to the filter bandwidth.

[0075] In this embodiment, after determining the filter bandwidth using the two methods described in the above embodiments, the bandwidth of the pseudo-random sequence is set to be equal to the filter bandwidth, and then the baseband signal is spread spectrum operated.

[0076] S250. The bandwidth of the pseudo-random sequence is multiplied by the baseband signal using a multiplier to obtain the first processed signal; wherein the bandwidth of the first processed signal is equal to the bandwidth of the filter.

[0077] In this embodiment, the processed signal output after the bandwidth of the pseudo-random sequence is multiplied by the baseband signal through a multiplier is a processed signal with the same bandwidth as the filter bandwidth.

[0078] S260. The first processed signal is modulated by the radio frequency transmitter to obtain a radio frequency signal, and the radio frequency signal is processed by the radio frequency front-end component and then transmitted.

[0079] In this embodiment, the radio frequency transmitter modulates the first processing signal to obtain a radio frequency signal, processes the radio frequency signal through the radio frequency front-end component, and transmits the processed radio frequency signal. It can be understood that after being modulated to the corresponding radio frequency bandwidth by the radio frequency transceiver, it can be transmitted through the antenna by the radio frequency front-end device.

[0080] In this embodiment, to facilitate a better understanding of the spread spectrum processing flow of the baseband signal to be transmitted at the transmitting end, the baseband data stream is multiplied by a pseudo-random sequence with a bandwidth equal to that of the filter through a multiplier to achieve spread spectrum. Figure 5 This is a schematic diagram illustrating the spread spectrum processing of a baseband signal to be transmitted at a transmitter, according to an embodiment of the present invention. In this embodiment, it is first determined whether the baseband signal needs to undergo adjacent channel leakage ratio suppression. If not, the normal channel transmission process proceeds. If so, the current channel filter bandwidth needs to be determined first, based on the filter bandwidth setting and a pseudo-random sequence equal to the filter bandwidth. After multiplying this pseudo-random sequence with the baseband data stream, the bandwidth of the new baseband data stream is equal to the filter bandwidth. After being modulated to the corresponding RF bandwidth by the RF transceiver, it can be transmitted through the antenna via the RF front-end device.

[0081] like Figure 5 As shown, the specific process of spreading the baseband signal to be transmitted at the transmitting end is as follows:

[0082] b1. Determine whether the baseband signal needs to be suppressed by the adjacent channel leakage ratio. If not, proceed to b2; if yes, proceed to b3.

[0083] b2. Proceed with the normal channel transmission procedure.

[0084] b3. Determine the filter bandwidth of the current channel.

[0085] b4. Based on the filter bandwidth setting, a pseudo-random sequence with the same bandwidth as the filter.

[0086] b5. The baseband data stream is multiplied by a multiplier and then multiplied by a pseudo-random sequence of the same bandwidth as the filter, and then output as a new data stream of the same bandwidth as the filter.

[0087] This can be understood as the bandwidth of the new baseband data stream being equal to the bandwidth of the filter. After being modulated to the corresponding RF bandwidth by the RF transceiver, it can be transmitted through the antenna via the RF front-end device.

[0088] In this embodiment, after multiplying the baseband data stream with a pseudo-random sequence of equal filter bandwidth, the channel bandwidth is spread across the entire filter bandwidth by the pseudo-random sequence. Therefore, one channel occupies the entire band, while the channel with the adjacent channel leakage ratio is outside the channel's band. Since the channel and filter widths are the same, adjacent channel leakage is also outside the filter band and can be filtered out by the filter. This means it can be filtered by the filter, resulting in better adjacent channel suppression characteristics and avoiding impact on parameters such as signal reception sensitivity.

[0089] The above-described technical solution in this embodiment determines the filter bandwidth of the channel according to a preset standard protocol, or generates a single-tone signal using a single-tone signal generator and uses the single-tone signal to test the filter bandwidth of the channel. Based on this, the bandwidth of the pseudo-random sequence is set to be equal to the filter bandwidth. The bandwidth of the pseudo-random sequence is multiplied by the baseband signal using a multiplier to obtain the processed first signal. The first processed signal is then modulated by an RF transmitter to obtain an RF signal. The RF signal is then processed by an RF front-end component. This allows the bandwidth of the pseudo-random sequence generated by the pseudo-random sequence generator to be determined by the filter bandwidth. The baseband signal is then spread using the bandwidth of the pseudo-random sequence to expand the bandwidth of the baseband signal to be the same as the filter bandwidth. This ensures that useful signals of the baseband signal can pass through the filter, while useless out-of-band signals, which are exactly outside the filter's band, are filtered out, thus achieving better signal filtering.

[0090] In one embodiment, Figure 6 This is a flowchart illustrating another signal processing method according to an embodiment of the present invention. This embodiment is applicable to situations where clutter signals are processed. Figure 6 As shown, this method, applied to the receiving end, specifically includes the following steps:

[0091] like Figure 6 As shown, the signal processing method in this embodiment may specifically include the following steps:

[0092] S610: Receives radio frequency signals and demodulates the radio frequency signals to obtain demodulated signals; wherein, the demodulated signals are baseband signals superimposed with pseudo-random sequences with specific bandwidth.

[0093] In this embodiment, after demodulating the radio frequency signal to obtain the demodulated signal, it is necessary to first determine whether the received radio frequency signal is a signal that has undergone the adjacent channel leakage ratio suppression method. If so, the baseband signal is demodulated using a specific pseudo-random sequence; otherwise, the normal channel reception process is executed.

[0094] S620: Obtain the baseband signal from the demodulated signal.

[0095] In one embodiment, obtaining the baseband signal from the demodulated signal includes: determining a pseudo-random sequence with a specific bandwidth from the demodulated signal based on the bandwidth and symbol characteristics of the pseudo-random sequence; and outputting the baseband signal through a multiplier. The symbol characteristics in this embodiment are the basic characteristics of the pseudo-random sequence, which, for example, may include symbol length, etc.

[0096] In this embodiment, to facilitate a better understanding of the process by which the receiver receives radio frequency signals to demodulate the baseband data stream, Figure 7 This is a schematic diagram illustrating a process by which a receiver receives a radio frequency (RF) signal and demodulates it to obtain a baseband data stream, according to an embodiment of the present invention. In this embodiment, it is first determined whether the received signal has undergone adjacent channel leakage ratio (ADRR) suppression. If not, the normal channel reception process is performed. If the signal has ADRR optimized, the RF signal is first demodulated to obtain a baseband data stream superimposed with a pseudo-random sequence. Then, based on the bandwidth and symbol characteristics of the pseudo-random sequence, a pseudo-random sequence is obtained. Finally, through a multiplier, the final baseband data stream is obtained.

[0097] like Figure 7 As shown, the specific process of the receiver receiving the radio frequency signal to demodulate the baseband data stream is as follows:

[0098] c1. Determine whether the radio frequency signal has undergone adjacent channel leakage ratio suppression. If not, proceed to c2; if yes, proceed to c3.

[0099] c2. Perform the normal channel reception procedure.

[0100] c3. Demodulate the radio frequency signal to obtain a baseband data stream superimposed with a pseudo-random sequence.

[0101] c4. Based on the bandwidth and symbol characteristics of the pseudo-random sequence, a pseudo-random sequence is obtained, which is then passed through a multiplier to obtain the final baseband data stream.

[0102] In one embodiment, Figure 8 This is a structural block diagram of a signal processing system provided in an embodiment of the present invention. The system includes a transmitter 810 and a receiver 820.

[0103] The transmitting end 810 is used to execute the signal processing method described in any embodiment of the present invention;

[0104] The receiving end 820 is used to execute the signal processing method described in any embodiment of the present invention.

[0105] The transmitting end includes a multiplier, a pseudo-random sequence generator, an RF transmitter, and an RF front-end assembly; the receiving end includes a multiplier, a pseudo-random sequence generator, an RF receiver, and an RF front-end assembly.

[0106] The multiplier is connected to the pseudo-random sequence generator and the radio frequency transmitter or the radio frequency receiver, respectively.

[0107] The radio frequency transmitter or the radio frequency receiver is connected to the radio frequency front-end component.

[0108] In one embodiment, the radio frequency transmitter and the radio frequency receiver each include a signal strength detection module; the receiver and the transmitter each include a single-tone signal generator, an adder, a first coupler, and a second coupler.

[0109] The adder is connected to the multiplier, the single-tone signal generator, and the radio frequency transmitter or the radio frequency receiver, respectively.

[0110] The radio frequency transmitter or the radio frequency receiver is connected to the first coupler;

[0111] The first coupler is connected to both the signal strength detection module and the radio frequency front-end component.

[0112] The radio frequency front-end component is connected to the second coupler;

[0113] The second coupler is connected to both the signal strength detection module and the antenna.

[0114] In some embodiments, a schematic diagram illustrating the connection structure of the multiplier, pseudo-random sequence generator, RF transmitter, and RF front-end components in the transmitter is provided for better understanding. Figure 9 This is a schematic diagram of a transmitter structure provided in an embodiment of the present invention.

[0115] In some embodiments, a schematic diagram illustrating the connection structure of the multiplier, pseudo-random sequence generator, RF receiver, and RF front-end components in the receiver is provided for better understanding. Figure 10 This is a schematic diagram of a receiving end provided in an embodiment of the present invention.

[0116] It should be noted that, since the RF transmitter and RF receiver (both can be referred to as RF transceivers) in this embodiment include a signal strength detection module; the receiver and transmitter also include a single-tone signal generator, an adder, a first coupler, and a second coupler, respectively; wherein, the signal strength detection module; the receiver and transmitter also include a single-tone signal generator, an adder, a first coupler, and a second coupler, which are part of the filter bandwidth used to determine the channel where the baseband signal is located. The structure has been described in the above embodiment, and will not be described in detail here.

[0117] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A signal processing method, characterized in that, Applied to the transmitting end, the method includes: Acquire the baseband signal to be transmitted and determine the filter bandwidth of the channel in which the baseband signal is located; The bandwidth of the pseudo-random sequence generator for generating pseudo-random sequences is determined based on the filter bandwidth. The baseband signal is spread based on the bandwidth of the pseudo-random sequence, and the spread-processed radio frequency signal is transmitted; wherein the bandwidth of the spread-processed radio frequency signal is equal to the bandwidth of the filter.

2. The method according to claim 1, characterized in that, The determination of the filter bandwidth of the channel containing the baseband signal includes one of the following: The filter bandwidth of the channel is determined according to a preset standard protocol; A single-tone signal is generated using a single-tone signal generator, and the filter bandwidth of the channel is tested using the single-tone signal.

3. The method according to claim 2, characterized in that, The monotone signal includes at least two first monotone signals; correspondingly, the step of generating the monotone signal through the monotone signal generator and using the monotone signal to test the filter bandwidth of the channel includes: The first single-tone signal around the center frequency of the frequency band in which the channel is located is generated by a single-tone signal generator; The first monotone signal is processed by an adder to obtain a second monotone signal, and the second monotone signal is transmitted to the radio frequency transmitter. The first single-tone radio frequency signal is obtained by modulating the second single-tone signal using the radio frequency transmitter; The first single-tone radio frequency signal is processed by the first coupler to obtain the first single-tone radio frequency signal strength, and the first single-tone radio frequency signal strength is fed back to the signal strength detection module in the radio frequency transmitter; wherein, the first single-tone radio frequency signal strength is the single-tone signal strength without filtering; The first single-tone radio frequency signal is processed by the radio frequency front-end component to obtain the second single-tone radio frequency signal. The second single-tone radio frequency signal is processed by the second coupler to obtain the strength of the second single-tone radio frequency signal, and the strength of the second single-tone radio frequency signal is fed back to the signal strength detection module in the radio frequency transmitter; wherein, the strength of the second single-tone radio frequency signal is the amplified and filtered single-tone signal strength; The signal strength detection module determines the suppression of the radio frequency filter on the corresponding frequency point of the first single-tone signal based on the strength of the first single-tone radio frequency signal and the strength of the second single-tone radio frequency signal. The signal strength detection module determines the filter bandwidth based on the suppression of the corresponding frequency point of the first single-tone signal.

4. The method according to claim 1, characterized in that, The step of determining the bandwidth of the pseudo-random sequence generator to generate the pseudo-random sequence based on the filter bandwidth includes: According to the filter bandwidth, the bandwidth of the pseudo-random sequence is set to be equal to the filter bandwidth.

5. The method according to claim 1, characterized in that, The step of spreading the bandwidth of the baseband signal based on the bandwidth of the pseudo-random sequence and transmitting the spread-spectrum radio frequency signal includes: The bandwidth of the pseudo-random sequence is multiplied by the baseband signal using a multiplier to obtain a first processed signal; wherein the bandwidth of the first processed signal is equal to the bandwidth of the filter. The first processed signal is modulated by an RF transmitter to obtain an RF signal, which is then processed by an RF front-end component and transmitted.

6. A signal processing method, characterized in that, Applied to the receiving end, the method includes: The radio frequency signal is received and demodulated to obtain a demodulated signal; wherein the demodulated signal is a baseband signal superimposed with a pseudo-random sequence with a specific bandwidth. The baseband signal is obtained from the demodulated signal.

7. The method according to claim 6, characterized in that, Obtaining the baseband signal from the demodulated signal includes: Based on the bandwidth and symbol characteristics of the pseudo-random sequence, a pseudo-random sequence with a specific bandwidth is determined from the demodulated signal; The baseband signal is output through a multiplier.

8. A signal processing system, characterized in that, The system includes a transmitter and a receiver; The transmitting end is used to execute the signal processing method according to any one of claims 1-5; The receiving end is used to execute the signal processing method according to any one of claims 6-7.

9. The system according to claim 8, characterized in that, The transmitting end includes: a multiplier, a pseudo-random sequence generator, an RF transmitter, and an RF front-end assembly; the receiving end includes: a multiplier, a pseudo-random sequence generator, an RF receiver, and an RF front-end assembly. The multiplier is connected to the pseudo-random sequence generator and the radio frequency transmitter or the radio frequency receiver, respectively. The radio frequency transmitter or the radio frequency receiver is connected to the radio frequency front-end component.

10. The system according to claim 9, characterized in that, The radio frequency transmitter and the radio frequency receiver each include a signal strength detection module; the receiver and the transmitter each include a single-tone signal generator, an adder, a first coupler, and a second coupler. The adder is connected to the multiplier, the single-tone signal generator, and the radio frequency transmitter or the radio frequency receiver, respectively. The radio frequency transmitter or the radio frequency receiver is connected to the first coupler; The first coupler is connected to both the signal strength detection module and the radio frequency front-end component. The radio frequency front-end component is connected to the second coupler; The second coupler is connected to both the signal strength detection module and the antenna.

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