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OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion

A fractional Fourier transform and communication system technology, applied in multi-frequency code systems, etc., can solve the problem of high peak-to-average power in OFDM systems, and achieve the effect of reducing the peak-to-average power ratio

Inactive Publication Date: 2012-02-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem of relatively high peak-to-average power in the existing OFDM system, thereby providing an OFDM communication system based on weighted fractional Fourier transform extension

Method used

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  • OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion
  • OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion
  • OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion

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specific Embodiment approach 1

[0048] Specific implementation mode 1. Combination Figures 1 to 4 Describe this specific embodiment, based on the weighted fractional Fourier transform extended OFDM communication system, it is characterized in that: the signal transmission process:

[0049] Step A1, converting the user's input data through serial / parallel conversion to obtain the converted result of M channels;

[0050] Step A2, carry out weighted fractional Fourier transform respectively to the converted results of M paths obtained in step A1 to obtain M path transformed results; the transformation coefficients of the weighted fractional Fourier transforms are controlled by the dynamic transformation parameter selection module, and the parameters are α, MV, NV;

[0051] Step A3, performing subcarrier mapping on the M-way transformation results obtained in step A2, to obtain N-way mapping results;

[0052] Step A4, performing Inverse Fast Fourier Transform on the N-way mapping results obtained in Step A3 t...

specific Embodiment approach 2

[0089] Specific embodiment two, combine Figure 5 Describe this specific embodiment, based on weighted fractional Fourier transform extended OFDM communication system, it is the OFDM communication system of multi-user multiple access,

[0090] Signal transmission process:

[0091] Step C1, the input data of each user among the multi-users is respectively serially / parallel converted, and each user among the multi-users obtains a result after conversion of M channels;

[0092]Step C2, performing weighted fractional Fourier transform on the M-way transformed results obtained by each user in the multi-user described in step C1, respectively, and each user in the multi-user obtains the M-way transformed result; among the multi-users The transformation coefficient of the weighted fractional Fourier transformation in each user is controlled by the dynamic transformation parameter selection module, and the parameters are α, MV, NV;

[0093] Step C3, performing user address selection...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion, which relates to the communication field, and in particular relates to a communication system based on the weighted score Fourier transform expansion. The invention solves the problem of high peak-to-average power ratio of the traditional OFDM communication system. According to the invention, the information to be transmitted is pre-treated through the weighted score Fourier transform expansion to change the energy distribution of information bit; and then the information is mapped to a corresponding sub-carrier for transmission so that the peak-to-average power ratio of the system is reduced and the system structure keeps flexible capability of frequency division multiple access of the traditional OFDM technology. The communication system disclosed by the invention is suitable for the transmission process of signals.

Description

technical field [0001] The present invention relates to the field of communication. Background technique [0002] With the development of society, people's demand for communication is increasing, and the transmission rate of communication system is getting higher and higher. Intersymbol interference caused by multipath effect has gradually become the main factor restricting system performance. Multi-carrier technology can convert high-speed serial data streams into multiple low-speed parallel data streams, so that the system can effectively solve the problem of intersymbol interference caused by multipath transmission by using simple frequency domain equalization technology, which greatly promotes The development of wireless broadband communication. Therefore, in recent years, multi-carrier transmission technology has been more and more researched and applied. [0003] Among them, Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier modulation techn...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 梅林沙学军李涛熊李娜吴宣利白旭
Owner HARBIN INST OF TECH
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