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Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal

A signal and block technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve the problems of reducing spectrum utilization efficiency and high computational complexity at the sending end

Active Publication Date: 2015-12-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional SLM method has two major application defects: 1. Obtaining different candidate signals requires multiple inverse fast Fourier transforms (Inverse Fast Fourier Transform, IFFT), and the computational complexity of the sending end is high
2. The receiving end needs to use additional sideband information to restore the original signal, which reduces the spectrum utilization efficiency

Method used

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  • Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal
  • Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal
  • Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal

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specific Embodiment approach

[0038] This embodiment uses the MATLAB simulation platform to test. The system parameters in the embodiment are as follows: modulation mode 16-QAM, number of subcarriers 256, input power feedback IBO of the power amplifier is 3, smoothing factor P=3.286 of the power amplifier, simulation times 10^5. Block number V=4, phase rotation factor sequence number U=3, channel simulation condition is EVA70 channel model, and its additional tap delay (ms): 0, 30, 150, 310, 370, 710, 1090, 1730, 2510 ; Relative tap power (dB): 0.0, -1.5, -1.4, -3.6, -0.6, -9.1, -7.0, -12.0, -16.9.

[0039] Frequency domain signal generation:

[0040] Such as figure 1 As shown, after 16-QAM modulation is performed on the original bit information stream, the original frequency domain signal is obtained after the serial-to-parallel conversion unit.

[0041] PAPR inhibition:

[0042] Interleaving the original frequency domain signal into 4 different frequency domain sub-blocks, each frequency domain sub-block is mu...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a block selected mapping (SLM) method for reducing the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. According to the block SLM method for reducing the PAPR of the OFDM signal, a large number of alternative sequences can be obtained through a small amount of low-dimension IFFT (Inverse Fast Fourier Transform) operation based on an IFFT property, so that the complexity of a transmitting end is lowered. A low-complexity blind detection way is adopted at a receiving end, and the transmitting end does not need to transmit additional sideband information, so that the spectrum utilization efficiency is increased.

Description

Technical field [0001] The present invention belongs to the field of wireless communication technology, and in particular relates to a block selective mapping (Selected Mapping, SLM) that reduces the peak-to-average power ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal method. Background technique [0002] OFDM technology is a research hotspot in the communication field. It is used by many current communication services by virtue of its strong anti-fading ability and efficient data transmission rate. The OFDM signal is a multi-carrier modulated signal. One of its main disadvantages is that it has a high PAPR and requires a high power amplifier (HPA) to have a high linear range, which leads to a reduction in the power efficiency of the HPA. In addition, the non-linearity of the power amplifier will cause non-linear distortion of signals with a large dynamic range, and reduce the system's Bit Error Rate (BER) performance. At present, there have been ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2621H04L27/263
Inventor 何向东杨霖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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