Communication device supporting spread spectrum and non-spread spectrum adaptive receiving

Abstract

The invention relates to a communication device supporting spread spectrum and non-spread spectrum adaptive receiving in the field of satellite communication. The spread spectrum communication transmission system is used for a low-rate communication occasion with a high anti-interference requirement, and the non-spread spectrum communication transmission system is used for a high-rate communication occasion with a high service real-time requirement; the self-adaptive receiving function is supported, the sending end adjusts the sending rate according to the link rainfall condition, the receiving end receives signals in a self-adaptive mode, and the rain attenuation resistance of the system is improved; the two channels can be mutually backed up, so that the reliability of the communication device is improved. The device is composed of a channel switching module, an adaptation module, a baseband processing module, a clock module, a combining module, a branching module, a main control module, a management switching module, a station control module and the like. The invention is very suitable for a vehicle-mounted station or a fixed station. The method is especially suitable for a satellite communication system which has high requirements on communication reliability, strong rain attenuation resistance and strong anti-interference capability and has asymmetric communication requirements.

Description

Technical Field

[0001] The present invention relates to a communication device supporting spread-spectrum and non-spread-spectrum adaptive reception in the field of satellite communication, and is particularly applicable to the technical field of satellite communication systems with high requirements for communication reliability, strong rain attenuation resistance, strong anti-interference ability, and asymmetric communication requirements. Background Art

[0002] Generally, a general satellite communication modem only supports one of the non-spread-spectrum communication system or the spread-spectrum communication system. The FDMA satellite modem only supports the non-spread-spectrum communication system and has low anti-interference ability. Although it can support multiple rate levels, has a high communication rate, and a relatively large communication rate range, the communication rate does not support adaptive reception. When the sending end needs to adjust the sending rate due to reasons such as changes in rainfall intensity or changes in service demand, it needs to communicate with the receiving end before adjusting the sending rate. Without other communication means, it may lead to the inability to establish a communication link. The CDMA satellite modem only supports spread-spectrum communication, has a low communication rate, and does not support communication for services such as video with a relatively high transmission rate. The modem only supports one channel. When the channel fails, the device cannot complete communication guarantee and can only repair or replace the modem. Two modems and a 1:1 switch can achieve overall mutual backup of the two modems, but cannot achieve independent backup of the two transmitting channels and two receiving channels of the two modems, reducing the use efficiency of the device and the reliability of the system. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies in the above background art and provide a satellite communication device that supports spread-spectrum and non-spread-spectrum communication transmission systems, data rate adaptive reception, and overall backup or separate backup of transmission and reception for two channels. The spread-spectrum communication transmission system is used for low-rate communication occasions with high anti-interference requirements, and the non-spread-spectrum communication transmission system is used for high-rate communication occasions with high requirements for service real-time performance; it supports the adaptive reception function, the sending end adjusts the sending rate according to the rainfall situation of the link, and the receiving end adaptively receives the signal to improve the rain attenuation resistance of the system; the two channels can be backed up each other, improving the reliability of the communication device. The present invention also has the characteristics of high standardization degree, small board size, simple manufacturing and debugging, stable and reliable performance, and strong environmental adaptability, and is very suitable for vehicle-mounted stations or fixed stations.

[0004] The object of the present invention is achieved as follows: A communication device supporting spread-spectrum and non-spread-spectrum adaptive reception, including a channel switching module, an adaptation module A, an adaptation module B, a baseband processing module A, a baseband processing module B, a combining module, and a splitting module. Signal transmission process: The channel switching module is used for port selection for data transmission and reception; it is connected to an external data device to complete the transmission and reception of external data; it sends the external data to adaptation module A or adaptation module B; adaptation module A or adaptation module B performs parallel-to-serial conversion and SDL transmission processing on the received data and then sends it to baseband processing module A or baseband processing module B; baseband processing module A or baseband processing module B is used to complete the baseband modulation function of the signal during the signal transmission process. After processing the received data through baseband signal processing including encoding, framing, modulation, and frequency conversion, it sends the data to the combining module; the combining module is connected to the transmitter through external interface B. Signal reception process: The splitting module is connected to the receiver through external interface C to receive external signals; the splitting module sends the received external signals to baseband processing module A and baseband processing module B respectively. Baseband processing module A and baseband processing module B complete signal detection, clock recovery, carrier recovery, and decoding of the baseband signal during the signal reception process, and send the processed data to the corresponding adaptation module. The adaptation module performs SDL reception and serial-to-parallel conversion processing on the data and finally sends it to the external device through the channel switching module.

[0005] Furthermore, each of baseband processing module A and baseband processing module B includes: a rate control module, a frame type encoding module, an LDPC encoding module, a framing module, a baseband modulation module, a D / A and up-conversion module, an A / D and down-conversion module, a signal detection module, a mode extraction module, and a demodulation module. During the signal transmission process, the rate control module generates rate parameter information according to service requirements. The frame type encoding module encodes and protects the received rate parameter information and forwards it to the framing module; the LDPC encoding module encodes and protects the data to be sent and sends the encoded information to the framing module; the framing module receives the information from the frame type encoding module and the LDPC encoding module, and after processing the received information in a frame format, it sends the information to the baseband modulation module. The baseband modulation module completes the spread spectrum modulation and shaping filtering of the framed symbols, and then the D / A and up-conversion module completes the digital-to-analog conversion of the transmitted digital signal and the up-conversion from zero frequency to intermediate frequency. During the signal reception process, the A / D and down-conversion module performs down-conversion from intermediate frequency to zero frequency and analog-to-digital conversion on the received signal and then sends it to the signal detection module; the signal detection module completes the reception of the synchronization signal and large frequency deviation compensation, and then the mode extraction module completes the extraction and identification of the signal rate and spread spectrum bandwidth; finally, the demodulation module performs despreading, clock recovery, carrier recovery, and LDPC decoding on the received signal.

[0006] Further, it also includes a main control module and a management switching module. The main control module is used to complete the local setting and monitoring of device parameters and status. The management switching module receives the control instructions sent by the main control module and forwards the control instructions. The main control module forwards the control instructions to the channel switching module through the management switching module to achieve the control of the channel switching module. The main control module forwards the control instructions to Baseband Processing Module A and Baseband Processing Module B through the management switching module to achieve the control and status monitoring of Baseband Processing Module A and Baseband Processing Module B.

[0007] Further, it also includes a station control module and a clock module. The station control module mainly completes the remote setting and monitoring of device parameters and status. One end of it is connected to an external station control computer, and the other end is connected to the main control module through the management switching module. By setting or querying the parameters of the main control module, it realizes the control and status monitoring of the channel switching module, Baseband Processing Module A, Baseband Processing Module B, and the clock module. The clock module is used to complete the access and clock distribution of the external 10 MHz clock reference and provide clocks for the two baseband processing modules. It is connected to the external interface D to realize the input of the external 10 MHz clock into the clock module. By accessing the external 10 MHz clock to the communication device, it realizes the common clock reference of the communication device and external devices such as transmitters and receivers.

[0008] Further, the adaptation modules and the baseband processing modules correspond one by one to form two functional channels in total. Among them, Adaptation Module A and Baseband Processing Module A are connected to form Functional Channel A, and Adaptation Module B and Baseband Processing Module B are connected to form Functional Channel B. The channel switching module can select any one of the functional channels to receive or send signals. When the two functional channels receive or send simultaneously, they are backup to each other.

[0009] Further, when one of the baseband processing modules operates in the spread spectrum communication mode, the other baseband processing module can choose to operate in the spread spectrum communication mode or the non-spread spectrum communication mode. Both the spread spectrum and non-spread spectrum communication modes support the rate adaptive reception function and support rate asymmetric communication.

[0010] The present invention has the following advantages compared with the background technology: 1. The present invention supports spread-spectrum communication and non-spread-spectrum communication transmission systems, data rate adaptive reception, and functions such as overall backup of two channels or separate backup for transmission and reception. The spread-spectrum communication transmission system is used for low-rate communication scenarios with high anti-interference requirements, and the non-spread-spectrum communication transmission system is used for high-rate communication scenarios with high requirements for service real-time performance; it supports the adaptive reception function. The transmitting end adjusts the transmission rate according to the rainfall situation of the link, and the receiving end adaptively receives the signal to improve the anti-rain fade ability of the system; the two channels can be backed up with each other, enhancing the reliability of the communication device.

[0011] 2. The present invention also has the characteristics of high standardization, small board size, simple manufacturing and debugging, stable and reliable performance, and strong environmental adaptability.

[0012] 3. The present invention also has the characteristics of functional scalability, etc. By adding 1 baseband processing module and 1 adaptation module, simultaneous communication of two channels can be achieved, and 1 channel provides backup for 2 channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the electrical schematic diagram of the present invention.

[0014] Figure 2 is the electrical schematic diagram of the baseband processing module of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described in detail below.

[0016] Referring to Figure 1-2 , the present invention includes a channel switching module 1, an adaptation module A 2, an adaptation module B 3, a baseband processing module A 4, a baseband processing module B 5, a clock module 6, a combining module 7, a splitting module 8, a main control module 9, a management switching module 10, and a station control module 11. As Figure 1 shown, Figure 1 is the electrical schematic diagram of the present invention, and the embodiment is connected according to the Figure 1 connection line.

[0017] In this embodiment, the channel switching module 1: is mainly used for port selection of data transmission and reception. Its pin a is used to connect to an external data device to complete the transmission and reception of external data; according to the control instruction input from pin f, the data input from pin a is sent to pin b or pin d, and the data input from pin c and pin d is sent to pin a. The connection between pin a and pins b, c, d, and e is achieved through a switching matrix based on FPGA. After parsing the control instruction issued by the main control module 9, the pin connection is performed.

[0018] Adapter Module A2 or Adapter Module B3: mainly used for data protocol conversion and processing. After the input data is subjected to processing such as network interface to synchronous data protocol conversion, serial-to-parallel conversion, and SDL frame framing through its pin a, it is sent to the pin a of the corresponding Baseband Processing Module A4 or Baseband Processing Module B5 through pin c; the data received through pin d is sent to the corresponding pin c or pin e of the Channel Switching Module 1 after processing such as SDL frame deframing, parallel-to-serial conversion, and synchronization to network interface data protocol conversion.

[0019] In the embodiment, Baseband Processing Module A4 or Baseband Processing Module B5: mainly completes the baseband modulation function of the signal during signal transmission. After the input data is subjected to baseband signal processing such as encoding, framing, modulation, and frequency conversion, it is sent to pins b and c of the Combiner Module 7 through pin c; during signal reception, it mainly completes baseband signal processing such as signal detection, clock recovery, carrier recovery, and decoding of the baseband signal. When Baseband Processing Module A4 operates in the spread-spectrum communication mode, Baseband Processing Module B5 can operate in the spread-spectrum communication mode or the non-spread-spectrum communication mode; vice versa. Both the spread-spectrum and non-spread-spectrum communication modes support the rate adaptive reception function and support rate asymmetric communication. Baseband Processing Module A4 or Baseband Processing Module B5 includes: Rate Control Module 12, Frame Type Encoding Module 13, LDPC Encoding Module 14, Framing Module 15, Baseband Modulation Module 16, D / A and Up-conversion Module 17, A / D and Down-conversion Module 18, Signal Detection Module 19, Mode Extraction Module 20, and Demodulation Module 21.

[0020] The rate control module 12 controls the current communication rate level according to service requirements; the frame type encoding module 13 performs encoding protection on the rate mode parameters; the LDPC encoding module 14 performs encoding protection on the data to be transmitted; the framing module 15 completes the framing format processing of control parameters, transmitted data, synchronization overhead, etc.; the baseband modulation module 16 completes the spread spectrum modulation and shaping filtering of the symbols after framing. Among them, the signal after framing mainly consists of three parts: the preamble sequence, the valid data, and the known symbols in the data. The method of spread spectrum modulation is as follows: the information rate variation range is from 1 kbps to 1024 kbps, and the spread spectrum ratio variation range is from 1 to 1024; a GOLD pseudo-random sequence with a length of 1024 is used as the spread spectrum code. For the signal with the lowest information rate of 1 kbps, a pseudo-random sequence with a length of 1024 is used to complete the spread spectrum of 1 symbol. When the information rate decreases, a pseudo-random sequence with a length of 1024 can complete the spread spectrum of 1 or more symbols, that is, the spread spectrum ratio is 1024. The information rate variation can support a change of 1 Hz. When the information rate doubles relative to the lowest information rate, a GOLD pseudo-random sequence with a length of 1024 can complete the spread spectrum of 2 symbols, that is, the spread spectrum ratio is 512, and so on, until a GOLD code with a length of 1024 can complete the spread spectrum of 1024 symbols, that is, the spread spectrum ratio is 1. The method of shaping filtering is as follows: the shaping filter uses a truncated square root Nyquist raised cosine function with a roll-off factor of 0.35, 0.25, 0.15, and 0.05. The symbol rate is divided into different ranges, and each range corresponds to a certain sampling multiple. Then, the frequency division ratio of the phase-locked loop is determined according to the data rate and sampling rate of each segment. Finally, the transmitted data is shaped filtered using the data clock and sampling clock. The D / A and up-conversion module 17 completes the digital / analog conversion of the transmitted digital signal and the up-conversion from zero frequency to intermediate frequency; the A / D and down-conversion module 18 completes the down-conversion from intermediate frequency to zero frequency of the received signal and the analog / digital conversion; the signal detection module 19 completes the reception of the synchronization signal and the compensation for large frequency deviations; the signal detection module 19 samples at 8 times the chip rate, extracts two samples and performs full correlation with the local spread spectrum code, and then accumulates the energy of 32 symbols, and compares it with the threshold to determine whether the capture is successful. To prevent false signal detection, it is necessary to continuously detect the energy accumulation of 32 symbols in 8 sliding times, and at the same time judge whether there are two adjacent peaks with an interval of 1 symbol. If it exists, it means the capture is successful.The mode extraction module 20 completes the extraction and recognition of the signal rate and the spreading bandwidth, and outputs the signal parameter mode word; the demodulation module 21 completes despreading of the signal, clock recovery, carrier recovery, and LDPC decoding; the despreading method is as follows: despread the received signal according to the signal parameter mode word, and one local spreading code can despread one or more symbols; to improve the anti-frequency offset ability of signal reception and the carrier recovery performance, for the preamble synchronization sequence, perform carrier recovery on the despread symbols according to a spreading ratio of one-half, and improve the carrier frequency deviation compensation accuracy by increasing the number of FFT calculation points. For the valid data after the preamble, use the scattered inserted known symbols for carrier tracking to improve the signal reception performance.

[0021] The main control module 9 mainly completes the local setting and monitoring of the device parameters and status. The pin a is connected to the pin a of the management switching module 10, and through the pin b of the management switching module 10, it is connected to the pin f of the channel switching module 1 to realize the control of the channel switching module 1; through the pin c of the management switching module 10, it is connected to the pin e of the baseband processing module A4 to realize the control and status monitoring of the baseband processing module A4; through the pin e of the management switching module 10, it is connected to the pin e of the baseband processing module B5 to realize the control and status monitoring of the baseband processing module B5; through the pin d of the management switching module 10, it is connected to the pin a of the clock module 6 to realize the control of the clock module 6. It is mainly divided into a foreground function module and a background function module. The foreground function module mainly realizes the user operation interface, facilitating the user to operate the device and serving as an interface for human-computer interaction; the background function module mainly realizes protocol parsing, reading and saving of device parameters, and forwarding of station control parameters and status.

[0022] The station control module 11 mainly completes the remote setting and monitoring of the device parameters and status. The pin b is connected to an external station control computer, through the pin a, it is connected to the pin f of the management switching module 10, and through the pin a of the management switching module 10, it is connected to the pin a of the main control module 9. By setting or querying the parameters of the main control module 9, it realizes the control and status monitoring of modules such as the channel switching module 1, the baseband processing module A4, the baseband processing module B5, and the clock module 6. It is mainly composed of a front-end acquisition module, an application service module, a station control proxy module, etc. The front-end acquisition module is responsible for the acquisition of device information, and realizes functions such as initialization of device interfaces, sending of query and control commands, and receiving and analysis of query and control responses. After receiving the real-time device information from the front-end acquisition module, the application service module sends the parameter change information to the station control proxy module; the station control proxy module receives external parameter queries and control commands, sends the command to the application service module, the application service module forwards it to the front-end acquisition module, the front-end acquisition module performs corresponding device query and control operations, and returns the query and control responses to the application service module. The application service module sends the response information to the station control proxy module, and the station control proxy reports it to the external device.

[0023] The clock module 6 of the present invention mainly completes the access of the external 10 MHz clock, the selection of the internal and external 10 MHz clocks and the clock division, and provides clocks for the two baseband processing modules. It is connected to the external interface D through the pin d to realize the input of the external 10 MHz clock into the clock module 6; it is connected to the pins f of the baseband processing module A4 and the baseband processing module B5 through the pin b and the pin c. By accessing the external 10 MHz clock to the communication device, the communication device and the external device transmitter and receiver can share the clock reference, which can improve the anti-system frequency deviation ability of the communication device. The internal 10 MHz clock or the external 10 MHz clock is divided into 3 paths of 10 MHz clocks after passing through the division circuit. Each path of 10 MHz clock after division outputs 3 paths of 10 MHz clocks with a power of 5 dBm after passing through the amplification circuit. The function of the amplification circuit is to improve the isolation between the 10 MHz clocks after division to avoid mutual interference on the one hand, and to ensure that the power of the 10 MHz after division is stable at 5 dBm on the other hand. The power range of the external 10 MHz input clock is 2 dBm to 8 dBm.

[0024] The pin a of the division module 8 of the present invention is connected to the receiver through the external interface C to receive external signals; the pin b and the pin c of the division module 8 are respectively connected to the pins d of the baseband processing module A4 and the baseband processing module B5. The connections of each interface and tube pins use low-loss lines, and the transmission frequency band supports 0 Hz to 6 GHz, with a loss less than 0.5 dB per meter.

[0025] The main working principle of the present invention is as follows: The adaptation module A2 and the baseband processing module A4 form the functional channel A, and the adaptation module B3 and the baseband processing module B5 form the functional channel B. The channel switching module can independently send and receive data using either the functional channel A or the functional channel B, or send data using one functional channel and receive data using the other functional channel. The two channels can either send and receive while backing up each other, or the transmissions of the two channels back up each other and the receptions back up each other. The external device communicates with the communication device to exchange data; the main control module 9 controls the channel switching module 1 to select the functional channel; the functional channel selects the transmission system and the transmission rate according to the task plan; if the current functional channel fails, the fault status is reported to the main control module 9, and the main control module 9 re-selects the functional channel. First, the overall switching of the functional channel is preferred, and secondly, the independent switching of the transmission or reception of the functional channel is performed; the station control module 11 is connected to the main control board through the network port, and realizes the control and status query of each functional module through the forwarding of the main control board.

[0026] The brief installation method of the present invention is as follows: Figure 1The main control module 9, clock module 6, channel switching module 1, management switching module 10, adapter module A2, baseband processing module A4, adapter module B3, baseband processing module B5, combining module 7, splitting module 8, and station control module 11 in it all adopt the 3U 5HP VPX standard and are inserted into the standard chassis in the above order; the external interface A, B, C, D, E connector sockets are installed on the rear panel; the assembly of the present invention is completed.

[0027] It should be understood that the above description of the specific implementation manners of the present invention is only an exemplary description listed for the convenience of those of ordinary skill in the art to understand the solution of the present invention, and does not imply that the protection scope of the present invention is only limited to these examples. Those of ordinary skill in the art can fully understand the technical solution of the present invention and, without any creative labor, obtain more specific implementation manners by combining technical features, replacing some technical features, adding more technical features, etc. to the various examples listed in the present invention. All these specific implementation manners are within the scope covered by the claims of the present invention. Therefore, these new specific implementation manners should also be within the protection scope of the present invention.

Claims

1. A communication device supporting spread-spectrum and non-spread-spectrum adaptive reception, characterized in that, It includes a channel switching module (1), an adaptation module A (2), an adaptation module B (3), a baseband processing module A (4), a baseband processing module B (5), a combining module (7) and a splitting module (8); Signal transmission process: The channel switching module (1) is used for port selection of data transmission and reception; it is connected to an external data device to complete the transmission and reception of external data; the channel switching module (1) sends the received external data to the adaptation module A (2) or the adaptation module B (3); the adaptation module A (2) or the adaptation module B (3) performs parallel-to-serial conversion and SDL transmission processing on the received data and then sends it to the baseband processing module A (4) or the baseband processing module B (5); the baseband processing module A (4) or the baseband processing module B (5) is used to complete the baseband modulation function of the signal during the signal transmission process, and after processing the received data through baseband signal processing including coding, framing, modulation and frequency conversion, it sends it to the combining module (7); the combining module (7) is connected to the transmitter through the external interface B; Signal reception process: The splitting module (8) is connected to the receiver through the external interface C to receive external signals; the splitting module (8) sends the received external signals to the baseband processing module A (4) and the baseband processing module B (5) respectively. The baseband processing module A (4) and the baseband processing module B (5) complete signal detection, clock recovery, carrier recovery and decoding of the baseband signal during the signal reception process, and send the processed data to the corresponding adaptation module. The adaptation module performs SDL reception and serial-to-parallel conversion processing on the data, and finally sends it to the external device through the channel switching module (1).

2. The communication device supporting spread-spectrum and non-spread-spectrum adaptive reception according to claim 1, wherein The baseband processing module A (4) or the baseband processing module B (5) both includes: a rate control module (12), a frame type encoding module (13), an LDPC encoding module (14), a framing module (15), a baseband modulation module (16), a D / A and up-conversion module (17), an A / D and down-conversion module (18), a signal detection module (19), a mode extraction module (20) and a demodulation module (21); During the signal transmission process, the rate control module (12) generates rate parameter information according to service requirements, and the frame type encoding module (13) encodes and protects the received rate parameter information and forwards it to the framing module (15); the LDPC encoding module (14) encodes and protects the data to be sent and sends the encoded information to the framing module (15); the framing module (15) receives the information from the frame type encoding module (13) and the LDPC encoding module (14), and after processing the received information into a framed format, it sends it to the baseband modulation module (16). The baseband modulation module (16) completes the spread spectrum modulation and shaping filtering of the framed symbols, and then the D / A and up-conversion module (17) completes the digital-to-analog conversion of the transmitted digital signal and the up-conversion from zero frequency to intermediate frequency; During the signal reception process, the A / D and down-conversion module (18) performs down-conversion from intermediate frequency to zero frequency and analog / digital conversion on the received signal, and then sends it to the signal detection module (19); the signal detection module (19) completes the reception of the synchronization signal and large frequency deviation compensation, and then the mode extraction module (20) completes the extraction and identification of the signal rate and spreading bandwidth; finally, the demodulation module (21) performs despreading, clock recovery, carrier recovery and LDPC decoding on the received signal.

3. A communication device supporting spread-spectrum and non-spread-spectrum adaptive reception according to claim 1, characterized in that It further includes a main control module (9) and a management and switching module (10). The main control module (9) is used to complete the local setting and monitoring of the device parameters and status; the management and switching module (10) receives the control instructions sent by the main control module (9) and forwards the control instructions. The main control module (9) forwards the control instructions to the channel switching module (1) through the management and switching module (10) to achieve the control of the channel switching module (1). The main control module (9) forwards the control instructions to the baseband processing module A (4) and the baseband processing module B (5) through the management and switching module (10) to achieve the control and status monitoring of the baseband processing module A (4) and the baseband processing module B (5).

4. A communication device supporting spread-spectrum and non-spread-spectrum adaptive reception according to claim 2, characterized in that, It further includes a station control module (11) and a clock module (6). The station control module (11) mainly completes the remote setting and monitoring of the device parameters and status. One end of it is connected to an external station control computer, and the other end is connected to the main control module (9) through the management and switching module (10). By setting or querying the parameters of the main control module (9), it realizes the control and status monitoring of the channel switching module (1), the baseband processing module A (4), the baseband processing module B (5) and the clock module (6). The clock module (6) is used to complete the access and clock distribution of the external 10MHz clock reference and provide clocks for the two baseband processing modules; it is connected to the external interface D to realize the input of the external 10MHz clock into the clock module (6); by accessing the external 10MHz clock to the communication device, it realizes the sharing of the clock reference between the communication device and external equipment transmitters and receivers.

5. A communication device supporting spread-spectrum and non-spread-spectrum adaptive reception according to claim 1, characterized in that The adaptation modules and the baseband processing modules correspond one by one to form two functional channels in total; among them, the adaptation module A (2) and the baseband processing module A (4) are connected to form the functional channel A, and the adaptation module B (3) and the baseband processing module B (5) are connected to form the functional channel B; the channel switching module (1) can select any one of the functional channels to receive or send signals; when the two functional channels receive or send simultaneously, they are backup to each other.

6. The communication device for supporting spread-spectrum and non-spread-spectrum adaptive reception according to claim 1, wherein When one of the baseband processing modules operates in the spread spectrum communication mode, the other baseband processing module can select to operate in the spread spectrum communication mode or the non-spread spectrum communication mode; both the spread spectrum and non-spread spectrum communication modes support the rate adaptive reception function and support rate asymmetric communication.

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