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A method of suppressing the peak-to-average ratio of ofdm communication signals based on pts technology

A communication signal and peak-to-average ratio technology, applied in the field of communication, can solve the problems of reducing OFDM bandwidth efficiency and OFDM symbol error, and achieve the effects of avoiding the increase of bit error rate, good practicability, and avoiding the decrease of bandwidth efficiency

Active Publication Date: 2018-12-07
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, when using PTS technology to generate low PAR OFDM symbol decoding, the original information can only be recovered when the side information is decoded correctly, otherwise it will cause the entire OFDM symbol to be wrong, and the side information occupies spectrum resources and reduces the bandwidth efficiency of OFDM

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  • A method of suppressing the peak-to-average ratio of ofdm communication signals based on pts technology
  • A method of suppressing the peak-to-average ratio of ofdm communication signals based on pts technology
  • A method of suppressing the peak-to-average ratio of ofdm communication signals based on pts technology

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0022] figure 1 Block diagram of OFDM coded modulation for PAR suppression. After the information bits to be transmitted are scrambled, they are sent to a convolutional code encoder, and the output bits of the encoder are subjected to PSK phase mapping. Then, the mapped symbol phase is sent to the row-column interleaver of K*V to complete the interleaving, and a K*V dimensional matrix is ​​constructed, wherein K=N / (V+1), and N is the number of subcarriers of the OFDM symbol. Each column of the matrix forms a subblock {d' v (k)}, a total of V, multiplied by Perform phase correction to obtain d vh (k), such as formula (1), where is a set of phase factors. then follow figure 2 In this way, each symbol of the comb-shaped pilot block and the coded information sub-block is evenly distributed on the frequency axis of the OFDM symbol at an interval of V+1, ...

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Abstract

The invention discloses a method for suppressing an OFDM communication signal Peak-to-Average Power Ratio (PAR) based on a PTS technology. A transmitting end generates an OFDM signal with a low PAR, and encoding and modulating steps include: (1) after performing scrambling processing on an information bit stream to be transmitted, feeding into a convolutional code encoder, and completing PSK phase mapping of a bit output by the encoder; (2) feeding a code element phase sequence into K*V-dimensional row-column interleaver to complete interleaving, and building a K*V-dimensional matrix, wherein K=N / (V+1), and N is the number of subcarriers of OFDM symbols; and (3) taking out code element phases of the K*V-dimensional matrix to form V subblocks of a size K, multiplying by exp(j(phi<h>)) to perform phase correction, performing OFDM modulation, and using optimal phase grouping to generate an OFDM signal with a minimum PAR again as a transmitting signal, thereby realizing PAR suppression. The method for suppressing the OFDM communication signal PAR based on the PTS technology has the beneficial effect that original information can be restored without using side information.

Description

technical field [0001] The invention relates to the communication field, more precisely, a method for suppressing the peak-to-average ratio of OFDM communication signals based on PTS technology. Background technique [0002] Channel selective fading caused by multipath effect is the main factor to reduce communication performance. OFDM communication technology uses orthogonal multi-carriers to transmit information in parallel, and divides the fading channel into multiple approximately flat channels, which has good anti-multipath performance. However, when the signals on multiple subcarriers are superimposed with a larger amplitude and phase at a certain moment, a large peak value may appear, resulting in a larger peak-to-average power ratio (Peak-to-Average Power Ratio , PAR). The greater the number of OFDM subcarriers, the greater the PAR. Excessively high PAR is a major shortcoming of the OFDM system. It requires very high dynamic range of some components of the system, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2615
Inventor 熊省军朱小辉谢哲王忠康祝献
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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