CN115549859A - Communication method and device supporting GMSK and QPSK - Google Patents

Communication method and device supporting GMSK and QPSK Download PDF

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CN115549859A
CN115549859A CN202211097040.3A CN202211097040A CN115549859A CN 115549859 A CN115549859 A CN 115549859A CN 202211097040 A CN202211097040 A CN 202211097040A CN 115549859 A CN115549859 A CN 115549859A
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signal
modulation
gmsk
qpsk
mode
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熊军
马杰
解琦
孙作亮
张志芳
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Xi'an Yufei Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The application relates to a communication method and a device supporting GMSK and QPSK, which relates to the technical field of communication, and the communication method comprises the following steps: selecting GMSK or QPSK as a modulation mode of a sending end to modulate a quasi-modulation signal according to the signaling configuration information to obtain a modulated signal, and obtaining a linear expression of the quasi-modulation signal in response to the selection of GMSK as the modulation mode of the sending end, wherein the quasi-modulation signal is obtained by a source information sequence after modulation pretreatment; carrying out synchronization processing and filtering processing on the modulated signal to obtain a receiving end synchronization signal; carrying out equalization preprocessing on the synchronous signal of the receiving end through an equalization preprocessing mode corresponding to the modulation mode of the transmitting end to obtain an equalization preprocessed signal; carrying out frequency domain equalization processing on the equalization preprocessing signal in a shared frequency domain equalization mode to obtain a soft output signal; and decoding the soft output signal to obtain a source information sequence. The method and the device can utilize the advantages of GMSK and QPSK, and save communication cost.

Description

Communication method and device supporting GMSK and QPSK
Technical Field
The present application relates to the field of communications, and in particular, to a communication method and apparatus supporting GMSK and QPSK.
Background
The existing GMSK (Gaussian minimum shift keying) and QPSK (quadrature phase shift keying) are two different modulation modes, and the GMSK and QPSK modulate and demodulate a source information sequence through respective independent systems, and the GMSK and QPSK cannot be compatible. Data detection in the existing GMSK demodulation process may be implemented using MLSE, which is implemented by a Viterbi detector. For example, the transmitted MSK symbol sequence is found at the receiving end, then mapped into binary information, and then estimated by the Viterbi detector. The content of the background art in the patent with publication number CN110753011A can be referred to for specific steps, and it can be seen from the content of the background art that the existing GMSK system is enough for the GSM system with only 250K, but cannot meet the requirement of the GMSK system with high rate (10 Mbit/s). Therefore, the demodulation method of the existing GMSK system is difficult to be used in a high-rate GMSK communication system. In addition, the spectral efficiency of GMSK is relatively low (one symbol represents 1 bit), which cannot meet the requirement of high-rate signals, but GMSK has a low peak-to-average ratio and has the advantage of longer transmission distance. While QPSK has high spectral efficiency (one symbol represents 2 bits) and can perform large-capacity communication, it cannot satisfy the requirement of transmitting signals over long distances.
Therefore, how to implement the above-mentioned two modulation schemes that can not only utilize the respective advantages of GMSK and QPSK to meet different requirements of signal transmission (high-speed transmission or long-distance transmission), but also share part of network equipment to save communication cost is a problem to be solved by those skilled in the art.
Disclosure of Invention
The purpose of the application is to provide a communication method supporting GMSK and QPSK, which jointly utilizes the advantages of long GMSK transmission distance and high QPSK spectrum efficiency, selects a QPSK modulation mode for signals needing high-speed transmission, selects a GMSK modulation mode for signals needing long-distance transmission, and simultaneously can enable the GMSK and the QPSK to share part of network equipment, thereby saving communication cost.
In a first aspect, the present application provides a communication method supporting GMSK and QPSK, including the steps of: selecting GMSK or QPSK as a modulation mode of a sending end to modulate a quasi-modulation signal according to signaling configuration information generated by network equipment to obtain a modulated signal, and acquiring a linear expression of the quasi-modulation signal before modulating the quasi-modulation signal in response to selecting GMSK as the modulation mode of the sending end, wherein the quasi-modulation signal is obtained by a source information sequence after modulation pretreatment; carrying out synchronization processing and filtering processing on the modulated signal to obtain a receiving end synchronization signal; carrying out equalization preprocessing on the receiving end synchronous signal through an equalization preprocessing mode corresponding to the transmitting end modulation mode to obtain an equalization preprocessing signal; carrying out frequency domain equalization processing on the equalization preprocessing signal in a shared frequency domain equalization mode to obtain a soft output signal; and decoding the soft output signal to obtain the source information sequence.
By adopting the technical scheme, a QPSK modulation mode can be selected for signals needing high-speed transmission, a GMSK modulation mode can be selected for signals needing long-distance transmission, the advantages of long GMSK transmission distance and high QPSK spectrum efficiency are fully utilized, and meanwhile, GMSK and QPSK can share frequency domain equalization equipment.
Optionally, the decoding the soft output signal includes: and carrying out demultiplexing processing on the soft output signal in a shared demultiplexing mode to obtain a demultiplexing signal.
By adopting the technical scheme, GMSK and QPSK can share the same demultiplexing equipment, and cost is saved.
Optionally, the decoding the soft output signal further includes: and de-interleaving the de-multiplexed signal in a common de-interleaving mode to obtain a de-interleaved signal.
By adopting the technical scheme, GMSK and QPSK can share the same de-interleaving equipment, and the cost is further saved.
Optionally, the decoding the soft output signal further includes: and decoding the de-interleaved signal by a common decoding mode to obtain the source information sequence.
By adopting the technical scheme, GMSK and QPSK can share the same decoding equipment, and the cost is further saved.
Optionally, the performing synchronization processing and filtering processing on the modulated signal includes: inserting a shared synchronization head of a sending end into the modulated signal to generate a synchronous signal of the sending end; filtering the synchronous signal of the sending end in a receiving end filtering mode corresponding to the modulation mode of the sending end to obtain a filtering signal; and carrying out synchronous processing on the filtered signals in a receiving end sharing synchronous processing mode corresponding to the transmitting end sharing synchronous head so as to obtain receiving end synchronous signals.
By adopting the technical scheme, GMSK and QPSK can share the same synchronous head at the transmitting end and the same synchronous processing mode at the receiving end, thereby simplifying the communication flow.
Optionally, the sending end uses a GMSK modulation scheme or a QPSK modulation scheme for the common synchronization header.
By adopting the technical scheme, any modulation mode can be selected according to the actual situation in the operation process to measure the frequency deviation and the timing synchronization.
Optionally, the linear expression of the quasi-modulation signal is:
Figure BDA0003839262930000021
in which I k For data after differential encoding of the source information sequence j k To the power of k of an imaginary number, C 0 (t-kT) is a time-limited amplitude modulated pulse.
By adopting the technical scheme, GMSK can be approximated to linear modulation, so that the equalizing technology suitable for QPSK can be conveniently transplanted to a GMSK system, and a basis is provided for QPSK and GMSK to share frequency domain equalizing equipment.
Optionally, the communication method further includes: and adding a preamble signal or a pilot training signal to the modulated signal, wherein the preamble signals or the pilot training signals corresponding to different modulation modes of the sending end are the same.
By adopting the technical scheme, the QPSK and the GMSK can share the same preamble signal or pilot training signal, so that the communication resource is saved.
Optionally, a modulation mode of the preamble signal or the pilot training signal is the same as a modulation mode of the transmitting end.
In a second aspect, the present application provides a communication apparatus supporting GMSK and QPSK, including: a transmitting end modulation module, configured to select GMSK or QPSK as a transmitting end modulation mode to modulate a pseudo modulation signal according to signaling configuration information generated by a network device to obtain a modulated signal, and obtain a linear expression of the pseudo modulation signal before modulating the pseudo modulation signal in response to selecting GMSK as the transmitting end modulation mode, where the pseudo modulation signal is obtained after a source information sequence is subjected to modulation pre-processing; the synchronous filtering module is configured to perform synchronous processing and filtering processing on the modulated signal to obtain a receiving end synchronous signal; the equalization preprocessing module is configured to perform equalization preprocessing on the receiving end synchronization signal in an equalization preprocessing mode corresponding to the transmitting end modulation mode to obtain an equalization preprocessed signal; a frequency domain equalization processing module configured to perform frequency domain equalization processing on the equalization preprocessed signal in a shared frequency domain equalization manner to obtain a soft output signal; and a decoding module configured to perform decoding processing on the soft output signal to obtain the source information sequence; the transmitting end modulation module, the synchronous filtering module, the equalization preprocessing module, the frequency domain equalization processing module and the decoding module are sequentially connected.
By adopting the technical scheme, a QPSK modulation mode can be selected for signals needing high-speed transmission, a GMSK modulation mode can be selected for signals needing long-distance transmission, the advantages of long GMSK transmission distance and high QPSK spectrum efficiency are fully utilized, meanwhile, GMSK and QPSK can share frequency domain equalization equipment, and the same framework can realize two communication modes. The cost is saved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the advantages of long GMSK transmission distance and high QPSK spectrum efficiency are jointly utilized, a QPSK modulation mode is selected for the signal needing high-speed transmission, and a GMSK modulation mode is selected for the signal needing long-distance transmission;
2. the GMSK and the QPSK can share network resources, and communication cost is saved.
Drawings
Fig. 1 is a flowchart illustrating a communication method supporting GMSK and QPSK according to an embodiment of the present application;
fig. 2 is a schematic diagram of a data frame structure in a communication method supporting GMSK and QPSK according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a synchronization process and a filtering process performed on the modulated signal according to an embodiment of the present application;
fig. 4 is an additive white gaussian noise simulation diagram of two modulation schemes in a communication method supporting GMSK and QPSK according to an embodiment of the present application;
fig. 5 is a simulation of suburban channels of two modulation schemes in a communication method supporting GMSK and QPSK according to an embodiment of the present application;
fig. 6 is a block diagram of a communication apparatus supporting GMSK and QPSK according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to fig. 1 to 6 and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
GMSK uses a digital modulation scheme called 0.3 GMSK. 0.3 represents the ratio of the gaussian filter bandwidth to the bit rate. GMSK is a special digital FM modulation scheme, i.e. 1 and 0 are represented by adding or subtracting detf MHz to the RF carrier frequency. A modulation technique in which 1 and 0 are expressed by two frequencies is called FSK (frequency shift keying). In GMSK the data rate is chosen to be fs Mbit/sec, just 4 times the RF frequency offset detf (fs =4 × detf), which minimizes the modulation spectrum and improves the channel efficiency. FSK modulation with a bit rate of exactly 4 times the frequency shift is called MSK (minimum shift keying). The GMSK further reduces the modulation spectrum using a gaussian premodulation filter, which can reduce the frequency conversion speed and avoid the energy radiated to the adjacent channel due to the fast frequency conversion. In addition, because GMSK is constant envelope, the peak-to-average ratio of GMSK is not obviously improved after passing through the digital filter, so the peak-to-average ratio of GMSK is lower than that of QPSK, and when the user rate of GMSK is reduced by one time and long-distance communication needs to be guaranteed, the peak-to-average ratio of GMSK is low, and long-distance communication can be realized. The basic procedure of GMSK transmission and the QPSK transmission modulation technique are the prior art, and are not described herein again.
Referring to fig. 1 and 2, the present application provides a communication method supporting GMSK and QPSK, including steps S101 to S105. In step S101, according to the signaling configuration information (including the modulation scheme) generated by the network device, GMSK or QPSK is selected as a modulation scheme of the transmitting end to modulate the signal to be modulated, so as to obtain a modulated signal. The pseudo modulation signal is obtained from a source information sequence after modulation preprocessing, and in an application scenario, the source information sequence may be a source binary information sequence generated by a source pseudo random sequence generator. In one embodiment, the data frame structure in the foregoing communication method is as shown in fig. 2, where a synchronization hop only transfers synchronization information data, a data hop only transfers data information, all data in one hop are added up to 1326 symbols, and the pre-modulation processing may include a series of preparation operations before modulation, such as parameter setting, channel coding, interleaving, burst data generation, and the like.
In order to enable QPSK and GMSK to share a frequency domain equalization device, when GMSK is selected as a modulation mode at a transmitting end, a linear expression of a pseudo-modulation signal needs to be obtained before modulating the pseudo-modulation signal, so that GMSK is approximated to linear modulation, for example, amplitude Modulation Pulse (AMP) decomposition using binary continuous phase modulation (BinaryCPM) provides a very accurate linear approximation for CPM (continuous phase modulation), and an equalization technique applicable to QPSK can be conveniently transplanted to a GMSK system. In one embodiment, the linear expression of the signal to be modulated is:
Figure BDA0003839262930000051
wherein I k For data after differential encoding of the source information sequence, j k To the power of k of an imaginary number, C 0 (t-kT) is a time-limited amplitude modulated pulse. The linear expression provides basis for QPSK and GMSK to share frequency domain equalization equipment, and the derivation process is as follows: because the source information sequence needs to be differentially encoded before modulating the signal to be modulated, there are:
Figure BDA0003839262930000052
wherein
Figure BDA0003839262930000053
a＝[...a 0 ，a 1 ，a 2 ，...]Is a transmitted source information sequence, wherein a i ∈{-1，1}。
And because of
Figure BDA0003839262930000054
So j A can be simplified as j A ＝l k j k
If the initial phase is ignored, the GMSK baseband signal may be expressed as:
Figure BDA0003839262930000055
at the same time, relative to C 0 (t) for C 1 (t)、C 2 (t) and C 3 The amplitudes of (t), etc. are very small and can be ignored, so the expression of GMSK baseband signals can be further simplified as:
Figure BDA0003839262930000056
equalization techniques suitable for linear modulation can therefore be applied to the demodulation scheme of GMSK signals.
In practical applications, the communication method further includes: and adding a preamble signal or a pilot training signal to the modulated signal, wherein the preamble signals or the pilot training signals corresponding to different modulation modes of the transmitting end are the same, i.e. QPSK and GMSK can share the same preamble signal or pilot training signal, thereby saving communication resources. However, the modulation mode of the preamble signal or the pilot training signal is the same as that of the transmitting end, that is, if the modulation mode of the transmitting end is GMSK, the modulation mode of the preamble signal or the pilot training signal also adopts GMSK; if the modulation mode of the transmitting end is QPSK, the modulation mode of the pilot signal or the pilot training signal also adopts QPSK.
Referring to fig. 2, in step S102, the modulated signal is subjected to a synchronization process and a filtering process to obtain a receiving-end synchronization signal. In practical applications, this step may include steps S1021 to S1023. At step S1021, a transmitting-end common synchronization header is inserted into the modulated signal to generate a transmitting-end synchronization signal. In a real-time scenario, since the synchronization processing is to perform frequency offset measurement and timing synchronization, the sending end common synchronization head may use a GMSK modulation scheme or a QPSK modulation scheme, and may select any modulation scheme according to the actual situation in the operation process.
In step S1022, the transmit-side synchronization signal is filtered by a receive-side filtering method corresponding to the transmit-side modulation method, so as to obtain a filtered signal. For example, if the modulation mode of the transmitting end is GMSK, the filtering mode of the receiving end also adopts a filtering mode of GMSK (e.g., low-pass filtering); if the modulation mode of the transmitting end is QPSK, the filtering mode of the receiving end also adopts the filtering mode of QPSK (e.g., root-raised cosine filtering). In one embodiment, before the foregoing filtering process, the synchronization signal at the transmitting end may also be low-pass filtered, and then enter the filtering process flow via a time-varying multipath channel. In step S1023, the filtered signal is synchronized by a receiver-side shared synchronization processing method corresponding to the sender-side shared synchronization header, so as to obtain a receiver-side synchronization signal. For example, if the sending end uses GMSK for the common synchronization header, the receiving end also uses GMSK for the common synchronization processing; if the sending end uses QPSK as the shared synchronization head, the receiving end also uses QPSK as the shared synchronization processing mode. GMSK and QPSK share the same synchronous head at the transmitting end and the same synchronous processing mode at the receiving end, so simplifying communication flow.
In step S103, the synchronization signal at the receiving end is equalized and preprocessed by an equalization preprocessing method corresponding to the modulation method at the transmitting end to obtain an equalized and preprocessed signal. For example, if the modulation mode of the transmitting end is GMSK, the equalization preprocessing mode includes, for example, parameter estimation of a memory channel, GMSK memory cancellation filtering, and GMSK multi-sampling point coherent demodulation; if the modulation mode of the sending end is QPSK, the equalization preprocessing mode comprises the extraction of the optimal sampling point and the phase correction. In step S104, the equalization preprocessed signal is frequency-domain equalized in a shared frequency-domain equalization manner to obtain a soft output signal, so that the GMSK and QPSK can share a frequency-domain equalization device.
At step S105, the soft output signal is decoded to obtain the source information sequence. In one embodiment, the decoding the soft output signal may include: demultiplexing the soft output signal in a shared demultiplexing mode to obtain a demultiplexed signal; de-interleaving the de-multiplexed signal in a common de-interleaving manner to obtain a de-interleaved signal; and carrying out decoding processing on the de-interleaved signal in a common decoding mode to obtain the source information sequence. GMSK and QPSK can share the same demultiplexing equipment, the same de-interleaving equipment and the same decoding equipment, and cost is further saved.
Referring to fig. 4 and 5, in order to verify the performance of GMSK and QPSK in the above communication method, fig. 4 is a simulation of additive white gaussian noise of GMSK and QPSK in the above communication method, and fig. 5 is a simulation of GMSK and QPSK in a suburban channel. As can be seen from the error rate curves in the graph, all reach the theoretical limit.
In a second aspect, referring to fig. 6, the present application provides a communication apparatus supporting GMSK and QPSK, including: a transmitting end modulation module, configured to select GMSK or QPSK as a transmitting end modulation mode to modulate a pseudo modulation signal according to signaling configuration information generated by a network device to obtain a modulated signal, and obtain a linear expression of the pseudo modulation signal before modulating the pseudo modulation signal in response to selecting GMSK as the transmitting end modulation mode, where the pseudo modulation signal is obtained after a source information sequence is subjected to modulation preprocessing; the synchronous filtering module is configured to perform synchronous processing and filtering processing on the modulated signal to obtain a receiving end synchronous signal; the equalization preprocessing module is configured to perform equalization preprocessing on the receiving end synchronization signal in an equalization preprocessing mode corresponding to the transmitting end modulation mode to obtain an equalization preprocessed signal; a frequency domain equalization processing module configured to perform frequency domain equalization processing on the equalized pre-processed signal in a shared frequency domain equalization manner to obtain a soft output signal; and a decoding module configured to perform decoding processing on the soft output signal to obtain the source information sequence; the transmitting end modulation module, the synchronous filtering module, the equalization preprocessing module, the frequency domain equalization processing module and the decoding module are sequentially connected. By adopting the embodiment, the advantages of long GMSK transmission distance and high QPSK spectrum efficiency are fully utilized, two communication modes can be realized by the same device, and the cost is saved.
The implementation process of the embodiment of the application may be as follows: firstly, a source pseudo-random sequence generator generates a source information sequence which can be a binary sequence, and after the source information sequence is subjected to channel coding, interleaving and burst data generation processes, the source information sequence is selected to be modulated by GMSK or QPSK according to signaling configuration information. In the case of GMSK, a sample sequence of high speed GMSK is formed. If the QPSK mode is adopted, QPSK modulation is adopted. The channel pilot frequency of each data block of the source information sequence keeps consistent with the modulation mode of the data block, so that the accuracy and consistency of subsequent channel estimation are ensured.
The periodic sending end and the shared synchronous head can adopt GMSK modulation mode, so the synchronous processing of the receiving end can be the same processing module, and GMSK and QPSK share the synchronous processing. Because the purpose of the synchronous head is to measure frequency deviation and timing synchronization, any one of the two modulation modes can be selected to complete the synchronization processing. The GMSK and QPSK transmit filters are different, the QPSK uses an RRC filter, the GMSK filter uses Gaussian filtering processing, and the GMSK and the QPSK can share a common low-pass filtering processing module before signal transmission. After filtering, GMSK and QPSK sequences pass through time-varying multipath channel and Gaussian white noise is added and sent to receiving filter for filtering. The output sample value sequence after the filtering processing of the receiving end does not undergo down-sampling, only noise and stray are filtered, meanwhile, the speed is not reduced, and then high-precision synchronization is carried out to complete timing and frequency offset measurement and frequency offset correction. After the synchronous processing is finished, GMSK and QPSK carry out respective channel estimation, and after respective channel estimation signals are obtained, the signals enter a unified equalization preprocessing module, and subsequent de-interleaving and decoding are processed by the unified module. The QPSK information rate is doubled for the same bandwidth. The same architecture implements two types of high-speed communications. GMSK transmits farther, and QPSK transmits efficiently.
The processing flow of the equalization preprocessing module is as follows: if the GMSK is the minimum shift keying (GMSK), firstly, parameter estimation of a memory channel, GMSK memory elimination filtering and GMSK multi-sampling-point coherent demodulation are carried out, and then a high-speed signal becomes a baseband rate of a physical layer and has a difference multiple IPOINT =4/8. In the case of QPSK, after timing synchronization, the best sampling point extraction and phase correction are performed first. The parameter estimation of the synchronous and memory channel and the memory elimination filtering processing in the GMSK system are carried out in two steps. In order to complete the memory-erasure filtering, the GMSK synchronization process and channel estimation must be performed first. The parameter estimation and memory cancellation filtering of the memory channel are both input with the received signal r, which is the sample sequence of the received GMSK burst signal. The oversampling factor OSR is defined as f s /r b Wherein f is s Is the sampling frequency, r b Is the symbol rate, L h Which represents the expected length of the channel impulse response in bit time. The channel estimator inputs the channel impulse response h into a memory-cancellation filter while passing the estimated burst position in the received signal r. Synchronization is obtained based on the correlation properties of the training sequences. Frequency domain equalization in subsequent flowAlternatively, GMSK and QPSK may be used in common. The frequency domain equalization removes intersymbol interference of the received signal, and the obtained soft output can restore the transmitted information after demultiplexing, deinterleaving and channel LDPC (Low Density Parity Check Code) decoding, thereby completing the whole process of information transmission.
The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A communication method supporting GMSK and QPSK, comprising the steps of:
selecting GMSK or QPSK as a modulation mode of a sending end to modulate a quasi-modulation signal according to signaling configuration information generated by network equipment to obtain a modulated signal, and acquiring a linear expression of the quasi-modulation signal before modulating the quasi-modulation signal in response to selecting GMSK as the modulation mode of the sending end, wherein the quasi-modulation signal is obtained by a source information sequence after modulation pretreatment;
carrying out synchronization processing and filtering processing on the modulated signal to obtain a receiving end synchronization signal;
carrying out equalization preprocessing on the receiving end synchronous signal through an equalization preprocessing mode corresponding to the transmitting end modulation mode to obtain an equalization preprocessing signal;
carrying out frequency domain equalization processing on the equalization preprocessing signal in a shared frequency domain equalization mode to obtain a soft output signal;
and decoding the soft output signal to obtain the source information sequence.
2. The communication method of claim 1, wherein said decoding the soft output signal comprises: and carrying out demultiplexing processing on the soft output signal in a shared demultiplexing mode to obtain a demultiplexing signal.
3. The communication method of claim 2, wherein said decoding the soft output signal further comprises: and de-interleaving the de-multiplexed signal in a common de-interleaving mode to obtain a de-interleaved signal.
4. The communication method of claim 3, wherein said decoding the soft output signal further comprises: and carrying out decoding processing on the de-interleaved signal in a common decoding mode to obtain the source information sequence.
5. The communication method according to any one of claims 1 to 4, wherein the performing synchronization processing and filtering processing on the modulated signal comprises:
inserting a shared synchronization head of a sending end into the modulated signal to generate a synchronous signal of the sending end;
filtering the synchronous signal of the sending end in a receiving end filtering mode corresponding to the modulation mode of the sending end to obtain a filtering signal;
and carrying out synchronous processing on the filtered signals in a receiving end sharing synchronous processing mode corresponding to the transmitting end sharing synchronous head so as to obtain receiving end synchronous signals.
6. The communication method according to claim 5, wherein the sending end common synchronization header uses a GMSK modulation scheme or a QPSK modulation scheme.
7. The communication method according to any of claims 1 to 4, wherein the linear expression of the signal to be modulated is:
Figure FDA0003839262920000011
wherein I k For the source information sequenceRow differential encoded data, j k To the k power of an imaginary number, C 0 (t-kT) is a time-limited amplitude modulated pulse.
8. The communication method according to any one of claims 1 to 4, further comprising: and adding a preamble signal or a pilot training signal to the modulated signal, wherein the preamble signals or the pilot training signals corresponding to different modulation modes of the sending end are the same.
9. The communication method according to claim 8, wherein the preamble signal or the pilot training signal is modulated in the same manner as the transmitting end.
10. A communication apparatus supporting GMSK and QPSK, comprising:
a transmitting end modulation module, configured to select GMSK or QPSK as a transmitting end modulation mode to modulate a pseudo modulation signal according to signaling configuration information generated by a network device to obtain a modulated signal, and obtain a linear expression of the pseudo modulation signal before modulating the pseudo modulation signal in response to selecting GMSK as the transmitting end modulation mode, where the pseudo modulation signal is obtained after a source information sequence is subjected to modulation preprocessing;
the synchronous filtering module is configured to perform synchronous processing and filtering processing on the modulated signal to obtain a receiving end synchronous signal;
the equalization preprocessing module is configured to perform equalization preprocessing on the receiving end synchronization signal in an equalization preprocessing mode corresponding to the transmitting end modulation mode to obtain an equalization preprocessed signal;
a frequency domain equalization processing module configured to perform frequency domain equalization processing on the equalized pre-processed signal in a shared frequency domain equalization manner to obtain a soft output signal; and
a decoding module configured to perform decoding processing on the soft output signal to obtain the source information sequence;
the transmitting end modulation module, the synchronous filtering module, the equalization preprocessing module, the frequency domain equalization processing module and the decoding module are sequentially connected.
CN202211097040.3A 2022-09-08 2022-09-08 Communication method and device supporting GMSK and QPSK Pending CN115549859A (en)

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