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MC-CDMA-based underwater acoustic communication system and PAPR suppression method

A technology of MC-CDMA and underwater acoustic communication, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as peak-to-average power ratio suppression performance loss, achieve improved autocorrelation performance, and reduce computational complexity , The effect of reducing the peak-to-average power ratio

Active Publication Date: 2019-11-29
OCEAN UNIV OF CHINA
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Problems solved by technology

This PSO-PTS method can effectively reduce the complexity of the algorithm, but has a slight loss in peak-to-average power ratio suppression performance

Method used

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  • MC-CDMA-based underwater acoustic communication system and PAPR suppression method
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  • MC-CDMA-based underwater acoustic communication system and PAPR suppression method

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Embodiment Construction

[0042] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0043] The present invention provides a kind of underwater acoustic communication system based on MC-CDMA, refer to figure 1 As shown, the underwater acoustic communication system based on multi-carrier code division multiple access (MC-CDMA) includes a sending device and a receiving device. module, frequency spreading module, IFFT transformation module, parallel-to-serial conversion module, data framing module, up-conversion module, and each module is connected in sequence. After the input data at the sending end undergoes scrambling processing, channel coding, interleaving coding and QPSK mapping processing, the input data after coding mapping undergoes serial-to-parallel conversion, spread spectrum modulation and IFFT transformation, and a guard interval is added to the time-domain signal after IFFT transformation After parallel-to-se...

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Abstract

The invention relates to an MC-CDMA-based underwater acoustic communication system and a PAPR suppression method, and the method comprises the steps: enabling a transmitting end to code input data after mapping, carrying out the serial-parallel conversion of the input data into q sub-data streams bi, and copying the bit of each sub-data stream bi into Np parts; generating a chaotic sequence according to the number U of subcarriers, and circularly multiplying the chaotic sequence by the basic spread spectrum sequence to generate a chaotic composite spread spectrum sequence C; multiplying each sub-data stream bi by the chaotic composite spread spectrum sequence C, and converting the multiplied sub-data streams bi into time domain signals through IFFT; and calculating the peak-to-average power ratio PAPR of the system according to the frequency band signal after up-conversion sampling. According to the PAPR suppression method disclosed by the invention, by changing the generation mode ofthe spreading code, the chaotic sequence is cyclically multiplied by basic spreading sequences such as an M sequence, a Walsh sequence or a completely complementary CCS sequence to generate a chaoticcomposite spreading sequence, so that the peak-to-average power ratio suppression characteristic of the system is improved. Compared with an amplitude limiting method, the method does not cause in-band distortion and out-of-band leakage. Compared with a probability method, the method is simple in operation mode and low in operation complexity.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic communication, and in particular relates to an MC-CDMA-based underwater acoustic communication system and a PAPR suppression method. Background technique [0002] Multi-Carrier Code Division Multiple Access (MC-CDMA) technology combines Orthogonal Frequency Division Multiplexing (OFDM) technology and Code Division Multiple Access (CDMA) technology, which has anti-frequency selective fading and reduces inter-symbol in underwater acoustic communication system. Advantages of Interference (ICI). In a multi-carrier underwater acoustic communication system, there are a large number of sub-carriers, and the instantaneous phases of each sub-carrier will be superimposed at a certain moment, resulting in a signal with excessive instantaneous power. That is to say, the multi-carrier code division multiple access underwater acoustic communication system has the disadvantage of high peak-to-averag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B13/02H04L27/00H04L27/26
CPCH04B1/707H04B13/02H04L27/001H04L27/2614
Inventor 刘兰军黎明牛炯陈家林任慧翟鹏赵昊毛吉存
Owner OCEAN UNIV OF CHINA
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