Doubly-selective channel estimation method based on V-OFDM (Vector-Orthogonal Frequency Division Multiplexing)

A dual-selective channel, V-OFDM technology, applied in the field of channel estimation, dual-selective channel estimation based on vector orthogonal frequency division modulation, can solve the problem of not considering channel estimation and so on

Active Publication Date: 2016-05-25
ZHEJIANG UNIV
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Problems solved by technology

After receiving the signal and sampling, the receiving end also obtains N=P×M serial data, forms a data block with a shape of P×M in the same way as the sending end, and performs P-point discrete Fu on each column of the data block Lie transform (FFT) restores the data b...

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  • Doubly-selective channel estimation method based on V-OFDM (Vector-Orthogonal Frequency Division Multiplexing)
  • Doubly-selective channel estimation method based on V-OFDM (Vector-Orthogonal Frequency Division Multiplexing)
  • Doubly-selective channel estimation method based on V-OFDM (Vector-Orthogonal Frequency Division Multiplexing)

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[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The double selection channel estimation method based on V-OFDM that the present invention proposes specifically comprises the following steps:

[0043] (1) Determine the channel maximum possible delay spread path number 6, Doppler spread path number 5, i.e. L=5, Q=4;

[0044] (2) determine the V-OFDM data block size N=P*M=1024, P=16 is the column number of data block, M=64 is the row number of data block, and the value of P, M satisfies P≥Q+2, M>2L+1; and add pilots and pilot guard intervals in the data block, such as figure 2 As shown; the method of adding the pilot and the guard interval of the pilot is specifically: the sending end and the receiving end generate random BPSK pilot point data through the same pseudo-random number generator, a total of 64, and select the V-OFDM data block Column 1 is the pilot column, and co...

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Abstract

The invention discloses a doubly-selective channel estimation method based on V-OFDM (Vector-Orthogonal Frequency Division Multiplexing). A way of adding pilot frequencies and pilot frequency protection intervals in V-OFDM sending data blocks is designed based on the existing V-OFDM transmission mechanism, so that perpendicularity of the pilot frequencies and the data is guaranteed. A BEM (Basis Expansion Model) channel module is utilized to carry out modelling on a channel at a receiving end and pilot frequency parts in the received V-OFDM data blocks are utilized to estimate a doubly-selective channel parameter matrix in the BEM model. In comparison with the conventional doubly-selective channel estimation and transmission scheme based on OFDM, the designed channel estimation scheme has the advantages that the estimation accuracy is improved and the complexity is reduced.

Description

technical field [0001] The invention relates to channel estimation technology in the communication field, in particular to a dual-selection channel estimation method based on vector orthogonal frequency division modulation. Background technique [0002] Wireless communication is a way of exchanging information by using electromagnetic waves to propagate in free space. At present, in the field of information communication, wireless communication develops the fastest and is most widely used. Providing reliable broadband communication services in high-speed mobile environments such as high-speed rail is a major challenge for next-generation communication systems. [0003] In wireless communication, system performance is greatly affected by the channel. Channel effects are generally divided into time or frequency selective fading and additive noise. Generally speaking, it is necessary to eliminate the influence of the channel and restore the signal sent by the sending end, an...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04J11/00
CPCH04J11/00H04J2011/0003H04L25/0204H04L25/022H04L25/0242H04L25/0256H04L27/2601
Inventor 张朝阳彭朱炜付攀玉张婧杨潇翔
Owner ZHEJIANG UNIV
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