A slm method for reducing the peak-to-average ratio of ofdm signals based on linear block coding

A linear grouping and signal peak technology, applied in the direction of multi-frequency code system, etc., can solve the problems of transmission efficiency reduction, loss, signal sequence recovery failure, etc., and achieve the effect of good PAPR and bit error rate performance

Inactive Publication Date: 2016-06-29
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

At the receiving end, the traditional SLM algorithm needs accurate sideband information to restore the OFDM signal. If the sideband information is transmitted incorrectly, the recovery of the entire signal sequence will fail or be lost. Therefore, the error detection probability of the sideband information has a great influence on the system error Performance Matters
Separate transmission of sideband information will occupy additional bandwidth, resulting in reduced transmission efficiency

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  • A slm method for reducing the peak-to-average ratio of ofdm signals based on linear block coding
  • A slm method for reducing the peak-to-average ratio of ofdm signals based on linear block coding
  • A slm method for reducing the peak-to-average ratio of ofdm signals based on linear block coding

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[0015] The main realization principles, specific implementation methods, etc. of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The principle of the SLM method for reducing OFDM signal peak-to-average ratio based on linear block coding as described in the present invention is as follows: In order to obtain accurate sideband information at the receiving end and correctly recover the downhole data signal, a linear grouping method for sideband information is proposed. Encoding, this encoding method is simple and easy to decode. In order to save the transmission of sideband information, the coded sideband information is superimposed on the downhole signal, and the sideband information is recovered by channel estimation method at the receiving end.

[0017] The main purpose of performing linear block coding on the sideband information is to ensure that the receiving end can recover the signal...

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Abstract

The invention discloses an SLM method for decreasing the peak-to-average power ratio of OFDM signals on the basis of linear block coding, which solves the problem that the PAPR (peak-to-average power ratio) of OFDM signals is high at present. In order to obtain accurate sideband information at the receiving end and correctly recover downhole data information, the invention puts forward linear block coding of sideband information, the coding method is simple, and moreover, decoding is easy. In order to dispense with sideband information transmission, the coded sideband information is superposed on downhole signals, and the sideband information is recovered by a channel estimation method at the receiving end. Theoretical analysis and a simulation result shows that under the condition of not decreasing the PAPR performance of a system, the linear block coding-improved SLM algorithm can obtain higher PAPR and bit error ratio performance than the conventional SLM algorithm does. The SLM method is easy to implement, and can be used in various communication systems adopting OFDM for modulation.

Description

technical field [0001] The present invention relates to the technical field of improving OFDM signals in an Orthogonal Frequency Division Multiplexing (OFDM) mobile communication system, in particular to an SLM method for reducing the peak-to-average ratio of OFDM signals based on linear block coding. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has become one of the core technologies of the fourth-generation mobile communication system due to its high-efficiency spectrum utilization, good anti-multipath fading performance, and large system capacity. However, since the OFDM signal is superimposed by multiple orthogonal subcarrier signals in the time domain, its signal has a high peak power to average power ratio (Peak-to-Average PowerRatio, PAPR), which requires mobile The high-power amplifier of the transmitter in the communication system has a high linearity, otherwise it will produce nonlinear distortion, and the harmonics gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽党煜蒲牛娜李芮杨娇
Owner SOUTHWEST PETROLEUM UNIV
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