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A Partial Transmission Sequence Peak-to-Average Ratio Suppression Algorithm Based on Bit Error Accumulation Detection in Underwater Acoustic Ofdm Communication System

A peak-to-average ratio suppression and communication system technology, which is applied in multi-frequency code systems, transmission systems, electrical components, etc., can solve the problem of affecting the real-time performance of underwater acoustic OFDM communication systems, the failure of sideband information to arrive in real time, and the reduction of system communication efficiency To achieve the effect of improving frequency band utilization and communication efficiency, saving sideband information, and reducing large-scale bit errors

Active Publication Date: 2019-10-18
HARBIN ENG UNIV
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Problems solved by technology

In this way, a large amount of sideband information needs to be transmitted, resulting in a reduction in system communication efficiency and a waste of frequency bands.
At the same time, because the sideband information does not arrive in real time, it also affects the real-time performance of the underwater acoustic OFDM communication system to a certain extent.

Method used

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  • A Partial Transmission Sequence Peak-to-Average Ratio Suppression Algorithm Based on Bit Error Accumulation Detection in Underwater Acoustic Ofdm Communication System
  • A Partial Transmission Sequence Peak-to-Average Ratio Suppression Algorithm Based on Bit Error Accumulation Detection in Underwater Acoustic Ofdm Communication System
  • A Partial Transmission Sequence Peak-to-Average Ratio Suppression Algorithm Based on Bit Error Accumulation Detection in Underwater Acoustic Ofdm Communication System

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] First, send the original data X at the data sending end D =[X D (0),X D (1),...,X D (N-1)] is divided into V sub-blocks X vD , the subscript v is used as the label to show the distinction, respectively multiplied by the phase weighting factor {b 1 ,b 2 ,...,b v}, the phase-weighted data After adding comb pilot X P =[X P (0),X P (1),...,X P (N-1)], the OFDM symbol can be expressed as the following form

[0022]

[0023] where Po={i 0 ,i 1 ,...,i Np-1} is the pilot subcarrier position, Po C is the complement set of Po in R=[0,1,...N-1], and is the position of the data subcarrier.

[0024] Will X m (k) Modulate to time domain to obtain OFDM candidate symbol x 0 ,x 1 ,...,x M-1 , according to formula (2)

[0025]

[0026] In formula (2), E(·) means to take the expectation, and max(·) means to take the ma...

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Abstract

The invention provides a partial transmit sequence peak-to-average ratio suppression algorithm in an underwater sound OFDM communication system based on bit error cumulative detection. Specifically, phase weighting factors are automatically judged through utilization of bit error transmit characteristics of error correcting codes in a coding OFDM system, thereby solving the problem that a traditional partial transmit sequence needs a great deal of sideband information. According to the algorithm, through adoption of a method of carrying out phase inverse weighting, decoding and secondary coding on received signals, bit error cumulative probabilities in the process are compared and calculated, the weighting factor automatic detection with very high accuracy is realized, the bandwidth utilization rate and communication efficiency of the system are effectively improved, the probability of occurring large-scale bit error phenomena resulting from sideband information errors is reduced, moreover, the timeliness of the communication system is ensured, and the algorithm is every applicable to the OFDM underwater sound communication system.

Description

technical field [0001] The invention relates to a partial transmission sequence peak-to-average ratio suppression algorithm in an underwater acoustic OFDM communication system based on code error accumulation detection, which belongs to the underwater acoustic orthogonal frequency division multiplexing (OFDM) communication system. Background technique [0002] An important obstacle to the wide application of MIMO-OFDM in underwater acoustic communication is its high peak-to-average power ratio (PAPR). The sensitivity of the OFDM system to the peak-to-average ratio makes the dynamic range and nonlinear distortion of some internal components of the system (such as power amplifiers, digital / analog converters, analog / digital converters, etc.) must meet very high requirements, which makes the equipment cost Substantially improved. Moreover, the transmission power of the underwater acoustic transducer is limited, and the peak-to-average ratio of the OFDM signal severely limits th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B13/02
Inventor 乔钢邢思宇刘凇佐周锋孙宗鑫
Owner HARBIN ENG UNIV
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