Superimposed training sequence non-linear companding method and device thereof

A training sequence, non-linear technology, applied in multi-frequency code systems and other directions, can solve problems such as large amount of calculation, increase system complexity, and poor practical effect, and achieve the effect of reducing the peak-to-average power ratio

Inactive Publication Date: 2010-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the current companding method is to increase the complexity of the system in exchange for the reduction of the peak-to-average ratio. Although the PAPR can be reduced, the amount of calculation is too large, and the practical effect is not very good.

Method used

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  • Superimposed training sequence non-linear companding method and device thereof
  • Superimposed training sequence non-linear companding method and device thereof
  • Superimposed training sequence non-linear companding method and device thereof

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Embodiment Construction

[0025] The main realization principles, specific implementation methods, etc. of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Please refer to figure 2 , this figure is a schematic diagram of the main process of processing the transmitted signal by using the non-linear companding method of superimposed training sequences proposed by the present invention. The focus of the present invention is to reduce the system peak-to-average power ratio. The main implementation process is as follows: Step A1 , the sending end performs serial-parallel processing on the input signal sequence; Step A2, for the parallel transmission signal sequence after serial-to-parallel conversion, selects part of the signal sequence and performs the following steps: Step T1, superimposes the training sequence r [N] Superimpose on the selected part of the signal sequence according to a certain power allocation factor ...

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Abstract

The invention discloses a superimposed training sequence non-linear companding method and a device thereof; in reducing the PAPR of a system, the method comprises the following steps that: a sending end serially transforms an input signal sequence, and some parallel signal sequences are extracted from the transformed signal sequence to be executed; power distribution is considered, and the parallel signal sequences and superimposed training sequences are added one by one correspondingly; the adding results and the remaining parallel signal sequences after extraction are processed parallelly; inverse fast fourier transformation is carried out to all parallel signals; a presented non-linear companding function compresses all transformed signals; and the sending end respectively calculates the peak power and average power ratio of all parallel signals through the processed transformation output results, and selects and sends a result with the minimum peak average ratio.

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, and in particular to a method for effectively reducing the peak-to-average power ratio of an OFDM system. Linear companding method and device thereof. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology, because of its high spectrum efficiency and strong anti-multipath fading ability, it has been extensively researched and developed in mobile communication systems. The peak-to-average power ratio refers to the ratio of the peak power to the average power of a signal, and is referred to as the peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR for short). Since the OFDM signal appears as the superposition of N orthogonal subcarrier signals in the time domain, a large peak value will be generated when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽伍晓琼刘盈黄家盛高頔
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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