CN103117838B - TCM-4CPM method for designing and the system of high-performance low complex degree - Google Patents
TCM-4CPM method for designing and the system of high-performance low complex degree Download PDFInfo
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Abstract
The invention discloses a kind of TCM-4CPM method for designing and system of high-performance low complex degree, the method comprises: receiving data information carries out grid coding, difference precoding, continuous phase coding, phase place molding filtration and phase-modulation, obtains TCM-4CPM baseband signal and launches; The described TCM-4CPM baseband signal receiving is carried out drawing described data message after digital phase detection, Timing Synchronization, the processing of signature decomposition mediation Soft decision decoding. The present invention realized power and frequency band all in limited channel effectively, transmission information reliably, also realized the simplification of TCM-4CPM technology simultaneously.
Description
Technical Field
The present invention relates to a wireless communication technology combining coding and modulation, and in particular, to a high-performance low-complexity TCM-4CPM (trellis coded modulation-4continuous phase modulation, trellis coded modulation combined with quaternary continuous phase modulation) design method and system.
Background
Nowadays, in the field of digital communication, in order to guarantee the effectiveness and reliability of transmission information, the main factors considered are the frequency band utilization rate and the power utilization rate, but it is difficult to guarantee both the frequency band utilization rate and the power utilization rate of the transmission information in practical application.
For example, in a power-limited channel, error correction coding is often used to increase the information controllable redundancy to increase the transmission bandwidth to obtain error correction capability, so that the reduction of the system frequency band utilization rate is replaced by the improvement of the power utilization rate; in a frequency band limited channel, the multivariate modulation is adopted to reduce the noise-resistant capability of a system so as to reduce the transmission bandwidth, thereby replacing the reduction of the power utilization rate of the system with the improvement of the frequency band utilization rate.
However, with the rapid development of wireless communication, large-bandwidth and long-distance transmission will become a development trend, and the corresponding transmission channel will no longer be a conventional power-limited channel or bandwidth-limited channel, but a channel limited in both power and frequency band. Therefore, the redundancy required for error correction coding is provided by enlarging the modulation signal set so as to avoid the reduction of the frequency band utilization rate caused by the addition of the error correction coding, but if the coding and the modulation and demodulation are designed separately and the demodulation before the coding is hard decision, a part of useful information is inevitably lost, and better performance is difficult to obtain.
TCM-4CPM (trellis coded modulation-4continuous phase modulation, a technique of trellis coded modulation combined with quaternary continuous phase modulation) is a technique combining coding and modulation, and is very suitable for channels with limited power and frequency bands.
The TCM (trellis coded modulation) is a technology for increasing a free euclidean distance of an output code sequence by a set partitioning method, so as to improve a signal power utilization rate, and particularly, the set partitioning is a key of a TCM scheme structure, namely, the set partitioning is to divide a signal diversity into smaller subsets containing the same number of signal points, and increase a minimum spatial distance between the signal points in the subsets obtained by the partitioning to the maximum extent;
4CPM (4 continuous phase modulation, quaternary continuous phase modulation) is a technology that has four phase change trends in one phase forming period, and can determine information transmission at a transmitting end according to the corresponding phase change trends, and each symbol of 4CPM carries 2-bit information, and has the characteristics of continuous phase, concentrated main lobe power spectrum density, low side lobe and the like.
The traditional TCM-4CPM system is very complex in design, and particularly, the demodulation and decoding technology of a receiving end is very difficult, so that the system is high in design cost and high in power consumption, and the popularization and application of TCM-4CPM are severely restricted.
Therefore, how to simplify the design of TCM-4CPM system and ensure effective and reliable information transmission in channels with limited power and frequency bands has become a problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a TCM-4CPM design method and system with high performance and low complexity, which solves the problem of effectively and reliably transmitting information in a channel with limited power and frequency band.
In order to solve the above technical problem, the present invention provides a TCM-4CPM design method with high performance and low complexity, which is characterized by comprising:
receiving data information, and carrying out grid coding, differential precoding, continuous phase coding, phase forming filtering and phase modulation to obtain a TCM-4CPM baseband signal for transmission;
and carrying out digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal to obtain the data information.
Further, receiving data information, performing trellis coding, differential precoding, continuous phase coding, phase shaping filtering and phase modulation to obtain a TCM-4CPM baseband signal, and transmitting, further comprising:
receiving the data information and carrying out grid coding processing;
carrying out differential pre-coding processing on the data information obtained after the grid coding;
carrying out continuous phase coding processing on the data information obtained after the differential pre-coding;
carrying out phase forming filtering processing on the data information obtained after the continuous phase coding;
and performing phase modulation processing on the data information obtained after the phase forming filtering to obtain a TCM-4CPM baseband signal for transmitting.
Further, the mesh encoding process is performed according to a maximum euclidean distance encoding structure.
Further, the phase modulation processing is performed on the data information obtained after the phase shaping filtering to obtain a TCM-4CPM baseband signal for transmission, and the method further includes: and after carrying out phase modulation processing on the data information obtained after the phase forming filtering, carrying out baseband quadrature modulation to obtain a TCM-4CPM baseband signal, and transmitting the TCM-4CPM baseband signal by adopting an intermediate frequency transmission system.
Further, the data information is obtained by performing digital phase discrimination, timing synchronization, symbol difference decomposition, and soft decision decoding on the received TCM-4CPM baseband signal, and the method further includes:
carrying out digital phase discrimination processing on the received TCM-4CPM baseband signal;
timing synchronization processing is carried out on the baseband signals obtained after the digital phase monitoring;
extracting a phase point with the maximum probability from the baseband signals obtained after timing synchronization, and performing symbol differential demodulation processing on the obtained phase distribution probability information;
and carrying out soft decision decoding processing on the signal obtained after the symbol differential demodulation to obtain the data information.
Further, the soft-decision decoding process is to perform a phase distance soft-decision metric and a viterbi decoding process.
In order to solve the above technical problem, the present invention further provides a TCM-4CPM design system with high performance and low complexity, which is characterized by comprising: a transmitting module and a receiving module; wherein,
the transmitting module is coupled with the receiving module and is used for carrying out grid coding, differential precoding, continuous phase coding, phase shaping filtering and phase modulation on received data information to obtain TCM-4CPM baseband signals and transmitting the TCM-4CPM baseband signals to the receiving module;
and the receiving module is coupled with the transmitting module and is used for carrying out digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal to obtain the data information.
Further, wherein the transmitting module comprises: the system comprises a grid coding unit, a differential precoding unit, a continuous phase coding unit, a phase shaping filtering unit and a phase modulation unit; wherein,
the grid coding unit is coupled with the differential pre-coding unit and is used for receiving the data information, carrying out grid coding processing on the data information and then sending the data information to the differential pre-coding unit;
wherein the trellis encoding process is performed according to a maximum euclidean distance encoding structure.
The differential pre-coding unit is coupled with the grid coding unit and the continuous phase coding unit and is used for carrying out differential pre-coding processing on the data information obtained by the grid coding unit and then sending the data information to the continuous phase coding unit;
the continuous phase coding unit is coupled with the differential pre-coding unit and the phase shaping filtering unit, and is used for carrying out continuous phase coding processing on the data information obtained by the differential pre-coding unit and then sending the data information to the phase shaping filtering unit;
the phase shaping filtering unit is coupled with the continuous phase coding unit and the phase modulation unit, and is used for carrying out phase shaping filtering processing on the data information obtained by the continuous phase coding unit and then sending the data information to the phase modulation unit;
and the phase modulation unit is coupled with the phase forming filtering unit and the receiving module, and is used for performing phase modulation processing on the data information obtained by the phase forming filtering unit to obtain a TCM-4CPM baseband signal and transmitting the TCM-4CPM baseband signal to the receiving module.
Further, the mesh encoding process is performed according to a maximum euclidean distance encoding structure.
Further, wherein the phase modulation unit is further configured to: and after carrying out phase modulation processing on the data information obtained by the phase forming filtering unit, carrying out baseband quadrature modulation to obtain TCM-4CPM baseband signals, and transmitting the TCM-4CPM baseband signals to the receiving module by adopting an intermediate frequency transmission system.
Further, wherein the receiving module includes: the device comprises a digital phase discrimination unit, a timing synchronization unit, a symbol differential demodulation unit and a soft decision decoding unit; wherein,
the digital phase discrimination unit is coupled with the transmitting module and the timing synchronization unit, and is configured to perform digital phase discrimination on the received TCM-4CPM baseband signal and send the processed signal to the timing synchronization unit;
the timing synchronization unit is coupled with the digital phase discrimination unit and the symbol difference decomposition phase modulation unit, and is used for performing timing synchronization processing on the baseband signal obtained by the digital phase discrimination unit and then sending the baseband signal to the symbol difference demodulation unit;
the symbol differential demodulation unit is coupled with the timing synchronization unit and the soft decision decoding unit, and is used for extracting a phase point with the maximum probability from the baseband signal obtained by the timing synchronization unit, performing symbol differential demodulation on the obtained phase distribution probability information, and sending the processed phase point to the soft decision decoding unit;
the soft-decision decoding unit is coupled to the symbol differential demodulation unit, and is configured to perform soft-decision decoding processing on the signal obtained by the symbol differential demodulation to obtain the data information.
Further, the soft-decision decoding process is to perform a phase distance soft-decision metric and a viterbi decoding process.
Compared with the prior art, the TCM-4CPM design method and the TCM-4CPM design system with high performance and low complexity have the following technical effects:
1. the high-performance low-complexity TCM-4CPM design method and the system realize effective and reliable information transmission in channels with limited power and frequency bands and simultaneously realize simplification of TCM-4CPM technology. The method has high frequency band utilization rate and high power utilization rate, and ensures the effectiveness and reliability of transmitted information.
2. The invention relates to a high-performance low-complexity TCM-4CPM design method and a system thereof, which are based on the theory of combining TCM and 4CPM in the traditional technology, carry out differential preprocessing, skillfully utilize the modulation rule of TCM technology on the phase of 4CPM signal, and correspondingly adopt an incoherent demodulation and phase soft decision method, thereby simplifying the design of traditional TCM-4CPM to a greater extent, particularly simplifying the structure, consuming less processing resources and being suitable for burst communication.
Drawings
FIG. 1 is a flowchart of a high-performance low-complexity TCM-4CPM design method according to a first embodiment of the present invention;
FIG. 2 is a detailed flowchart of step 101 of the method according to one embodiment of FIG. 1;
FIG. 3 is a flowchart illustrating a step 102 of the method according to the embodiment of FIG. 1;
fig. 4 is a structural block diagram of a high-performance low-complexity TCM-4CPM system according to a second embodiment of the present invention;
FIG. 5 is a block diagram illustrating a detailed structure of a transmitting module 401 in the system according to the second embodiment of FIG. 4;
FIG. 6 is a block diagram illustrating a detailed structure of the receiving module 402 in the system according to the second embodiment of FIG. 4;
FIG. 7 is a detailed circuit block diagram of a transmitter module fabricated by the system according to one embodiment;
fig. 8 is a specific circuit configuration diagram of a receiving module fabricated by the system according to the embodiment.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to include any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections. The following description is of the preferred embodiment for carrying out the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
As shown in fig. 1, a high-performance low-complexity TCM-4CPM design method according to an embodiment of the present invention includes the following steps:
step 101, receiving data information, carrying out grid coding, differential precoding, continuous phase coding, phase forming filtering and phase modulation to obtain a TCM-4CPM baseband signal, and transmitting the TCM-4CPM baseband signal;
and 102, performing digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal to obtain the data information.
The data information described herein is a binary data stream in the following embodiment, and the TCM-4CPM baseband signal is I, Q two-way baseband signals, although the invention is not limited thereto.
Specifically, as shown in fig. 2, step 101 includes:
step 1011, receiving the data information and performing Trellis Coded (TCM) processing;
wherein, the grid coding processing is carried out according to a maximum Euclidean distance coding structure;
step 1012, performing differential pre-coding processing on the data information obtained after the trellis coding;
step 1013, performing continuous phase encoding processing on the data information obtained after the differential pre-encoding;
step 1014, performing phase shaping filtering processing on the data information obtained after the continuous phase encoding;
and step 1015, performing phase modulation processing on the data information obtained after the phase shaping filtering to obtain a TCM-4CPM baseband signal for transmitting.
Wherein, step 1015 further includes: and after carrying out phase modulation processing on the data information obtained after the phase forming filtering, carrying out baseband quadrature modulation to obtain a TCM-4CPM baseband signal, and transmitting the TCM-4CPM baseband signal by adopting an intermediate frequency transmission system.
Specifically, as shown in fig. 3, step 102 includes:
step 1021, performing digital phase discrimination processing on the received TCM-4CPM baseband signal;
wherein, step 1021 further comprises: carrying out incoherent demodulation on the received TCM-4CPM baseband signal and then carrying out digital phase discrimination processing;
step 1022, performing timing synchronization processing on the baseband signal obtained after the digital phase monitoring;
step 1023, extracting phase points with maximum probability from the baseband signals obtained after timing synchronization, and performing symbol differential demodulation processing on the obtained phase distribution probability information;
and 1024, performing soft-decision decoding processing on the signal obtained after the symbol differential demodulation to obtain the data information.
The soft decision decoding process in step 1024 is to perform phase distance soft decision metric and viterbi decoding process.
The soft decision decoding is adopted instead of the data soft decision processing in the prior art, so that the purpose is to obtain effective data information after decoding, simplify the receiving structure and ensure the effectiveness and reliability of baseband information.
As shown in fig. 4, a high-performance low-complexity TCM-4CPM design system according to the second embodiment of the present invention includes: a transmitting module 401 and a receiving module 402; wherein,
the transmitting module 401 is coupled to the receiving module 402, and configured to perform trellis coding, differential precoding, continuous phase coding, phase shaping filtering, and phase modulation on received data information to obtain a TCM-4CPM baseband signal and transmit the TCM-4CPM baseband signal to the receiving module 402;
the receiving module 402 is coupled to the transmitting module 401, and configured to perform digital phase discrimination, timing synchronization, symbol difference decomposition, and soft decision decoding on the received TCM-4CPM baseband signal to obtain the data information.
The data information described herein is a binary data stream in the following embodiment, and the TCM-4CPM baseband signal is I, Q two-way baseband signals, although the invention is not limited thereto.
Specifically, as shown in fig. 5, the transmitting module 401 includes: a grid coding unit 4011, a differential precoding unit 4012, a continuous phase coding unit 4013, a phase shaping filtering unit 4014 and a phase modulation unit 4015; wherein,
the trellis encoding unit 4011 is coupled to the differential precoding unit 4012, and configured to receive the data information, perform trellis encoding (TCM encoding) processing, and send the processed data information to the differential precoding unit 4012;
wherein the trellis encoding process is performed according to a maximum euclidean distance encoding structure.
The differential pre-coding unit 4012 is coupled to the trellis coding unit 4011 and the continuous phase coding unit 4013, and configured to perform differential pre-coding processing on the data information obtained after the trellis coding unit 4011 and send the data information to the continuous phase coding unit 4013;
the continuous phase coding unit 4013 is coupled to the differential precoding unit 4012 and the phase shaping filtering unit 4014, and configured to perform continuous phase coding processing on the data information obtained by the differential precoding unit 4012 and send the processed data information to the phase shaping filtering unit 4014;
the phase shaping filter unit 4014 is coupled to the continuous phase coding unit 4013 and the phase modulation unit 4015, and configured to perform phase shaping filter processing on the data information obtained by the continuous phase coding unit 4013 and send the data information to the phase modulation unit 4015;
the phase modulation unit 4015 is coupled to the phase shaping filtering unit 4014 and the receiving module 402, and configured to perform phase modulation processing on the data information obtained by the phase shaping filtering unit 4014 to obtain a TCM-4CPM baseband signal, and transmit the TCM-4CPM baseband signal to the receiving module 402.
Wherein the phase modulation unit 4015 is further configured to: after the data information obtained by the phase shaping filter unit 4014 is subjected to phase modulation processing, baseband quadrature modulation is performed to obtain TCM-4CPM baseband signals, and the TCM-4CPM baseband signals are transmitted to the receiving module 402 by using an intermediate frequency transmission system.
It will be apparent to those skilled in the art that, in addition to the assembly of the transmitter module according to the above, the assembly may be performed according to the specific circuit configuration diagram shown in fig. 7.
Specifically, as shown in fig. 6, the receiving module 402 includes: a digital phase discrimination unit 4021, a timing synchronization unit 4022, a symbol differential demodulation unit 4023, and a soft decision decoding unit 4024; wherein,
the digital phase discrimination unit 4021 is coupled to the transmitting module 401 and the timing synchronization unit 4022, and is configured to perform digital phase discrimination on the received TCM-4CPM baseband signal and send the processed signal to the timing synchronization unit 4022;
wherein, the digital phase discrimination unit 4021 is further configured to: and carrying out incoherent demodulation on the received TCM-4CPM baseband signal and then carrying out digital phase discrimination processing.
The timing synchronization unit 4022 is coupled to the digital phase discrimination unit 4021 and the symbol differential demodulation unit 4023, and is configured to perform timing synchronization processing on a baseband signal obtained by the digital phase discrimination unit 4021 and send the baseband signal to the symbol differential demodulation unit 4023;
the symbol differential demodulation unit 4023 is coupled to the timing synchronization unit 4022 and the soft decision decoding unit 4024, and is configured to extract a phase point with a maximum probability from the baseband signal obtained by the timing synchronization unit 4022, perform symbol differential demodulation on the obtained phase distribution probability information, and send the demodulated information to the soft decision decoding unit 4024;
the soft-decision decoding unit 4024 is coupled to the symbol differential demodulation unit 4023, and is configured to perform soft-decision decoding processing on the signal obtained by the symbol differential demodulation unit 4023 to obtain the data information.
The soft decision decoding process includes phase distance soft decision measurement and Viterbi decoding.
The soft decision decoding is adopted instead of the data soft decision processing in the prior art, so that the purpose is to obtain effective data information after decoding, simplify the receiving structure and ensure the effectiveness and reliability of baseband information.
It will be apparent to those skilled in the art that, in addition to the assembly of the receiving module according to the above, the assembly can be performed according to the specific circuit configuration diagram shown in fig. 8.
Compared with the prior art, the TCM-4CPM design method and the TCM-4CPM design system with high performance and low complexity have the following technical effects:
1. the high-performance low-complexity TCM-4CPM design method and the system realize effective and reliable information transmission in channels with limited power and frequency bands and simultaneously realize simplification of TCM-4CPM technology. The method has high frequency band utilization rate and high power utilization rate, and ensures the effectiveness and reliability of transmitted information.
2. The invention relates to a high-performance low-complexity TCM-4CPM design method and a system thereof, which are based on the theory of combining TCM and 4CPM in the traditional technology, carry out differential preprocessing, skillfully utilize the modulation rule of TCM technology on the phase of 4CPM signal, and correspondingly adopt an incoherent demodulation and phase soft decision method, thereby simplifying the design of traditional TCM-4CPM to a greater extent, particularly simplifying the structure, consuming less processing resources and being suitable for burst communication.
Although the present invention has been described in connection with preferred embodiments, it will be understood by those skilled in the art that the methods and systems of the present invention are not limited to the embodiments described in the detailed description, and various modifications, additions, and substitutions are possible, without departing from the spirit and scope of the invention as defined in the accompanying claims.
Claims (8)
1. A high-performance low-complexity Trellis Coded Modulation (TCM) -4CPM (continuous phase modulation) design method combining a quaternary continuous phase modulation technology is characterized by comprising the following steps of:
receiving data information and carrying out grid coding processing;
carrying out differential pre-coding processing on the data information obtained after the grid coding;
carrying out continuous phase coding processing on the data information obtained after the differential pre-coding;
carrying out phase forming filtering processing on the data information obtained after the continuous phase coding;
transmitting TCM-4CPM baseband signals obtained after carrying out phase modulation processing on the data information obtained after the phase forming filtering;
carrying out digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal to obtain data information;
wherein the trellis encoding process is performed according to a maximum euclidean distance encoding structure.
2. The method according to claim 1, wherein the TCM-4CPM baseband signal obtained by performing phase modulation on the data information obtained by the phase shaping filtering is transmitted, and further comprising: and performing phase modulation processing on the data information obtained after the phase forming filtering, performing baseband quadrature modulation to obtain a TCM-4CPM baseband signal, and transmitting the obtained TCM-4CPM baseband signal by adopting an intermediate frequency transmission system.
3. The high-performance low-complexity TCM-4CPM design method according to claim 1, wherein the data information is obtained by performing digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal, and further comprising:
carrying out digital phase discrimination processing on the received TCM-4CPM baseband signal;
performing timing synchronization processing on the baseband signal obtained after the digital phase discrimination;
extracting a phase point with the maximum probability from the baseband signal obtained after timing synchronization, and carrying out symbol differential demodulation processing on the obtained phase distribution probability information;
and carrying out soft decision decoding processing on the signal obtained after the symbol differential demodulation to obtain the data information.
4. The high performance low complexity TCM-4CPM design method of claim 3, wherein the soft decision decoding process is a phase distance soft decision metric and a Viterbi decoding process.
5. A high-performance low-complexity Trellis Coded Modulation (TCM) -4CPM design system combining a quaternary continuous phase modulation technology is characterized by comprising the following steps: the system comprises a grid coding unit, a differential precoding unit, a continuous phase coding unit, a phase shaping filtering unit, a phase modulation unit and a receiving module; wherein,
the grid coding unit is coupled with the differential precoding unit and is used for receiving data information, carrying out grid coding processing on the data information and then sending the data information to the differential precoding unit;
the differential pre-coding unit is coupled with the grid coding unit and the continuous phase coding unit and is used for carrying out differential pre-coding processing on data information obtained by carrying out grid coding processing on the grid coding unit and then sending the data information to the continuous phase coding unit;
the continuous phase coding unit is coupled with the differential precoding unit and the phase shaping filtering unit, and is used for carrying out continuous phase coding processing on data information obtained by carrying out differential precoding processing on the differential precoding unit and then sending the data information to the phase shaping filtering unit;
the phase shaping filtering unit is coupled with the continuous phase coding unit and the phase modulation unit, and is used for carrying out phase shaping filtering processing on data information obtained by carrying out continuous phase coding processing on the continuous phase coding unit and then sending the data information to the phase modulation unit;
the phase modulation unit is coupled with the phase shaping filtering unit and the receiving module, and is configured to perform phase modulation processing on data information obtained by performing phase shaping filtering processing on the phase shaping filtering unit to obtain a TCM-4CPM baseband signal, and transmit the obtained TCM-4CPM baseband signal to the receiving module;
the receiving module is coupled to the phase modulation unit and configured to perform digital phase discrimination, timing synchronization, symbol difference decomposition and soft decision decoding on the received TCM-4CPM baseband signal to obtain data information;
wherein the trellis encoding process is performed according to a maximum euclidean distance encoding structure.
6. The high-performance low-complexity TCM-4CPM design system of claim 5, wherein the phase modulation unit is further configured to: and after carrying out phase modulation processing on the data information obtained by the phase forming filtering unit, carrying out baseband quadrature modulation to obtain a TCM-4CPM baseband signal, and transmitting the obtained TCM-4CPM baseband signal to the receiving module by adopting an intermediate frequency transmission system.
7. The high-performance low-complexity TCM-4CPM design system of claim 5, wherein the receiving module comprises: the device comprises a digital phase discrimination unit, a timing synchronization unit, a symbol differential demodulation unit and a soft decision decoding unit; wherein,
the digital phase discrimination unit is coupled with the phase modulation unit and the timing synchronization unit, and is configured to perform digital phase discrimination processing on the received TCM-4CPM baseband signal and send the processed signal to the timing synchronization unit;
the timing synchronization unit is coupled with the digital phase discrimination unit and the symbol differential demodulation unit, and is used for performing timing synchronization processing on the baseband signal obtained by the digital phase discrimination unit and then sending the baseband signal to the symbol differential demodulation unit;
the symbol differential demodulation unit is coupled with the timing synchronization unit and the soft decision decoding unit, and is used for extracting a phase point with the maximum probability from the baseband signal obtained by the timing synchronization unit, performing symbol differential demodulation on the obtained phase distribution probability information, and sending the phase point to the soft decision decoding unit;
the soft-decision decoding unit is coupled to the symbol differential demodulation unit, and is configured to perform soft-decision decoding processing on the signal obtained by the symbol differential demodulation unit to obtain the data information.
8. The high performance low complexity TCM-4CPM design system of claim 7, wherein the soft decision decoding process is a phase distance soft decision metric and a Viterbi decoding process.
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