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Orthogonal Frequency Division Multiplexing (OFDM) signal processing method and system

A technology of multiplexing signals and orthogonal frequency division, applied in orthogonal multiplexing system, multi-frequency code system, multiplexing communication, etc. The search process is cumbersome, the complexity is reduced, and the effect of reducing the peak-to-average power ratio

Inactive Publication Date: 2009-11-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The purpose of the present invention is to propose an OFDM signal processing method and system, which can overcome the cumbersome defect of the optimal phase factor search process in the prior art, and provide a good peak-to-average power ratio suppression effect

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  • Orthogonal Frequency Division Multiplexing (OFDM) signal processing method and system
  • Orthogonal Frequency Division Multiplexing (OFDM) signal processing method and system
  • Orthogonal Frequency Division Multiplexing (OFDM) signal processing method and system

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Embodiment Construction

[0041] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0042] Such as figure 1 As shown, it is a schematic diagram of the principle of an embodiment of the OFDM signal processing method of the present invention. Embodiments of the present invention can be figure 2 The steps of the illustrated embodiment are realized, including:

[0043] Step 101. Divide an OFDM signal in the frequency domain into multiple non-overlapping subsequences with the same size. For an OFDM system containing N subcarriers, at the transmitter side, it is necessary to construct a frequency-domain OFDM signal X=[X[0],X[1],...,X[N- 1]] T . Divide it into D non-overlapping subsequences X 1 , X 2 ,...X D , each subsequence is of length N / D:

[0044] X = Σ d = 1 D X...

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Abstract

The invention relates to an orthogonal frequency division multiplexing (OFDM) signal processing method, comprising the processing steps of the transmitting end of: using baseband modulation signal to form a frequency-domain OFDM signal and dividing the signal into a plurality of non-overlapping subsequences in the same size; filling zero in the subsequences, respectively, and performing inverse discrete fourier transform (IDFT) to get a plurality of time-domain partial sequences; and using the expression of peak-to-average power ratio (PAPR) obtained by phase rotation factor weighting as an optimized objective function to perform genetic operation, and using the obtained optimal solution as the optimal phase rotation factor; weighting the optimal phase rotation factor, getting and sending the weighted time-domain OFDM signal. The invention also relates to an OFDM signal processing system. In the selection course of the phase rotation factor, the invention utilizes large-scale optimization characteristics of the genetic algorithm, overcomes the existing defect that the optimal phase rotation factor searching process is trivial, and effectively reduces the PAPR as well as complexity of hardware implementation.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a processing method and system for Orthogonal Frequency Division Multiplexing (OFDM for short) signals, which are applicable to single-antenna and multi-antenna systems. Background technique [0002] The feature of OFDM technology is that the high-speed data stream is allocated to several sub-carriers with relatively low transmission rates for transmission through serial-to-parallel conversion. Spectrum utilization. In addition, the frequency domain subchannel bandwidth corresponding to each subcarrier is smaller than the signal bandwidth, so that the frequency selective channel is converted into a series of frequency flat fading channels, which effectively reduces the intersymbol interference caused by multipath fading. Due to the above advantages, OFDM technology has been widely used in wireless local area networks, enhanced third-generation mobile communication s...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 陶小峰王轶崔琪楣许晓东张平
Owner BEIJING UNIV OF POSTS & TELECOMM
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