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A time-frequency transform decoding method and device suitable for ovxdm system and ovxdm system

A time-frequency transform and decoding technology, applied in the field of signal processing, can solve the problems of reducing the complexity of decoding, the decoding method is difficult to meet the requirements of real-time decoding, and the complexity of decoding is increased, so as to reduce the complexity of decoding. , The effect of solving the spectral efficiency and decoding complexity, and simplifying the decoding process

Active Publication Date: 2021-11-16
广东天珩通电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the one hand, the larger the number of overlapping K, the better for the requirement of improving spectral efficiency; When it increases to a certain value, for example, when K is greater than 8, the decoding complexity increases sharply. The existing decoding methods are difficult to meet the requirements of real-time decoding. Spectrum efficiency forms a relationship with decoding complexity, decoding efficiency and storage resource overhead Contradictory needs

Method used

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  • A time-frequency transform decoding method and device suitable for ovxdm system and ovxdm system
  • A time-frequency transform decoding method and device suitable for ovxdm system and ovxdm system
  • A time-frequency transform decoding method and device suitable for ovxdm system and ovxdm system

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Embodiment 1

[0046] In this embodiment, an OvFDM system may be taken as an example for description.

[0047] Such as image 3 As shown, it is the sending end of the OvFDM system, which first encodes the frequency domain signal according to certain rules, then converts the frequency domain signal into a time domain signal, that is, performs inverse Fourier transform, and then sends the signal out. Specifically, an initial envelope waveform is first generated according to the design parameters; then the above initial envelope waveform is shifted in the frequency domain according to a predetermined frequency spectrum interval according to the number of overlapping multiplexing to obtain the envelope waveform of each subcarrier; then the input The data sequence is multiplied by the corresponding subcarrier envelope waveform to obtain the modulation envelope waveform of each subcarrier; then the modulation envelope waveform of each subcarrier is superimposed in the frequency domain to obtain th...

Embodiment 2

[0059] In this embodiment, the OvTDM system may be taken as an example for description.

[0060] Such as Figure 5 As shown, it is the OvTDM system transmitting end, which first generates an initial envelope waveform in the time domain according to the design parameters; The offset envelope waveform at each moment; then multiply the input data sequence with the offset envelope waveform at each moment to obtain the modulation envelope waveform at each moment; then superimpose the modulation envelope waveform at each moment in the time domain, The complex modulation envelope waveform in the time domain is obtained for transmission, wherein the time interval is Δt, Δt=T / K, T is the time domain width of the initial envelope waveform, and K is the number of overlapping multiplexing.

[0061] It can be seen from the above process that the OvTDM system is actually an equivalent convolutional coding system, and its coding model is shown in the attached Figure 6 As shown, the input ...

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Abstract

This application discloses a time-frequency transform decoding method and device suitable for OvXDM system and OvXDM system. The method includes: receiving the signal and processing it to obtain a digital received signal sequence in the first domain; dividing the digital received signal sequence in the first domain by the digital multiplexed waveform signal sequence in the first domain, thereby obtaining the digital received signal sequence in the first domain The digital transmission signal sequence in the first domain is converted into the digital transmission signal sequence in the second domain; the digital transmission signal sequence in the second domain is judged, and the judgment result is output as a decoding sequence. This application simplifies the decoding process, saves the storage resources of the system, reduces the decoding complexity, improves the real-time performance of the decoding output, and makes the decoding complexity basically only related to the data length, not affected by the number of overlaps , so that the complexity does not increase exponentially when increasing the number of overlaps.

Description

technical field [0001] The present application relates to the field of signal processing, in particular to a time-frequency transform decoding method and device suitable for an OvXDM system and the OvXDM system. Background technique [0002] For overlapping multiplexing systems—such as overlapping time division multiplexing (OvTDM, Overlapped Time Division Multiplexing) systems and overlapping frequency division multiplexing (OvFDM, Overlapped Frequency Division Multiplexing) systems, the greater the number of overlapping multiplexing K, the higher the spectral efficiency, so It is necessary to increase the number K of overlapping multiplexing as much as possible. [0003] However, in traditional decoding, it is necessary to continuously visit the nodes in the trellis graph (Trellis), and set two memories for each node, one is used to store the relative best path to the node, and the other is used to store the relative optimal path to the node. The measure corresponding to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 不公告发明人
Owner 广东天珩通电子科技有限公司
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