Method and device for time-frequency transform decoding suitable for OvXDM system and OvXDM system

A time-frequency conversion and decoding device technology, applied in the field of signal processing, can solve problems such as increased decoding complexity, reduced decoding complexity, and difficult decoding methods to meet the requirements of real-time decoding, so as to reduce decoding complexity degree, save system resources, solve the effects of spectrum efficiency and decoding complexity

Active Publication Date: 2018-01-30
广东天珩通电子科技有限公司
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  • Abstract
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  • 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

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  • Method and device for time-frequency transform decoding suitable for OvXDM system and OvXDM system
  • Method and device for time-frequency transform decoding suitable for OvXDM system and OvXDM system
  • Method and device for time-frequency transform decoding 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

The present invention discloses a method and device for time-frequency transform decoding suitable for an OvXDM system and an OvXDM system. The method comprises: receiving signals and processing the signals to obtain a digital received signal sequence in a first domain; dividing the digital received signal sequence in the first domain by a digital multiplexed waveform signal sequence in the firstdomain to obtain a digital transmission signal sequence in the first domain; converting the digital transmission signal sequence in the first domain to a digital transmission signal sequence in a second domain; and performing decision of the digital transmission signal sequence in the second domain, and taking a decision result as a decoding sequence for output. The method and device for time-frequency transform decoding suitable for an OvXDM system and the OvXDM system simplify a decoding process, save storage resources of a system, reduce the decoding complexity, improve the real-time performance of decoding output, and allow the decoding complexity basically to be only related to a data length without influence of the number of overlapping, so that the complexity cannot be increased with an index rate when the number of times of overlapping is improved.

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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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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