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Method for reducing height power ratio in multi-carrier system

A peak-to-average power ratio, multi-carrier system technology, applied in multi-frequency code systems, orthogonal multiplexing systems, diversity/multi-antenna systems, etc. and other issues to achieve the effect of improving frequency band utilization and reducing implementation complexity

Inactive Publication Date: 2008-05-07
BEIJING UNIV OF POSTS & TELECOMM +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these methods have their own limitations, or the complexity of the system implementation is too high, or the data transmission rate is reduced, or the signal distortion is too large, resulting in a decrease in the bit error performance of the system, etc.

Method used

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  • Method for reducing height power ratio in multi-carrier system
  • Method for reducing height power ratio in multi-carrier system
  • Method for reducing height power ratio in multi-carrier system

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Embodiment Construction

[0026] The present invention is illustrated below with reference to the accompanying drawings.

[0027] figure 1 It is a functional block diagram of the CAZAC sequence-based orthogonal matrix transformation of the present invention in a single-antenna OFDM system. The source signal at the sending end is encoded and modulated to obtain a frequency-domain OFDM signal X=[X[0], X[1],...,X[N-1]] T , the signal and the orthogonal transformation matrix A constructed by a certain CAZAC sequence that the system has set P After multiplication, a new frequency domain signal Y is obtained:

[0028] Y=A P X (3)

[0029] The frequency domain signal Y is transformed by IFFT, and a cyclic prefix is ​​added to form a complete time domain OFDM symbol, which is sent out through the transmitting antenna. Here, the original frequency domain signal X is transformed into the frequency domain signal Y, and the corresponding fast orthogonal algorithm in signal processing can be used instead of ma...

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Abstract

The present invention discloses a method for reducing the peak average power ratio of the multi-carrier system based on the orthogonal matrix transform of the CAZAC. By damaging the relevant property of frequency domain signal, the peak average power ratio of the multi-carrier system is reduced; the present invention is especially fit for OFDM system and can be flexibly applied for SISO and MIMO multi-carrier system. The method comprises the steps that a CAZAC sequence is set to construct the N multiplied by N orthogonal transformation matrix. Every OPDM symbol (frequency domain signal) on every emitting antenna is multiplied by the orthogonal transformation matrix before the multi-carrier modulation of the transmitting terminal to reduce the peak average power ratio of the system. The method does not need any SI and can effectively promote the frequency band utilization rate. By adopting the orthogonal transformation, fast algorithm can be used for reducing the complexity of the system realization.

Description

technical field [0001] The invention proposes a method for reducing the signal peak-to-average power ratio in a multi-carrier system, which is suitable for single-antenna and multi-antenna systems. Background technique [0002] Multi-carrier modulation (for example, Orthogonal Frequency Division Multiplexing (OFDM) technology) has attracted more and more attention due to its high spectrum efficiency and strong anti-interference ability. At present, multi-carrier modulation technology has become a part of the wireless local area network standard, and has become one of the most promising technologies in systems such as super three-generation mobile communication. [0003] Since the output of a multi-carrier system is the superposition of multiple sub-channel signals, if the phases of multiple signals are consistent, the instantaneous power of the superimposed signal obtained will be far greater than the average power of the signal, resulting in a higher peak-to-average power r...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L27/26H04J11/00
CPCY02D30/70
Inventor 陶小峰王轶张平王晓秋铃木利则
Owner BEIJING UNIV OF POSTS & TELECOMM
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