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Transform domain equalization method for dual selective channels based on vector OFDM

An equalization method and transform domain technology, applied in baseband system components, shaping network in transmitter/receiver, digital transmission system, etc., can solve problems such as limited applicability and high complexity

Active Publication Date: 2016-08-03
ZHEJIANG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high complexity and poor applicability of the prior art, and provide a transform domain equalization method based on VectorOFDM dual selective channels

Method used

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  • Transform domain equalization method for dual selective channels based on vector OFDM
  • Transform domain equalization method for dual selective channels based on vector OFDM
  • Transform domain equalization method for dual selective channels based on vector OFDM

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Embodiment Construction

[0067] The Transform Domain Equalization (TrDE: TransformDomainEqualization) method of VectorOFDM-based dual-selective channels is: the sending end converts the signal to be transmitted into a matrix form, and adds a two-dimensional cyclic prefix CP or zero padding ZP to obtain an extended matrix, and then uses VectorOFDM modulation, the matrix is ​​mapped to the time-frequency domain and sent. The received signal is first demodulated by VectorOFDM, and then the transform domain signal is obtained by two-dimensional FFT. After equalization by a single-tap filter, the estimate of the original transmitted signal is obtained by two-dimensional IFFT. value;

[0068] Considering the equivalent baseband signal model, the dual-selection channel is modeled by BEM (BasisExpansionModel), and the carrier frequency of the transmitted signal is f c =2GHz, transmission bandwidth B=5MHz, sampling frequency T s =1 / B=0.2μs, data block length N=64×64, wherein the effective information part is ...

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Abstract

The invention discloses a doubly selective channel transform domain equalization method based on Vector OFDM. In the wireless communication under a high-speed mobile environment, a channel undergoes serious doubly selective fading, according to the method, symbols to be sent are mapped to a two-dimensional time-frequency domain through a Vector OFDM modulation technology, a doubly selective channel is passes through, Vector OFDM demodulation is carried out, guard intervals are ingeniously designed, namely, cyclic prefixes or zero padding, the two-dimensional linear convolution of the channel can be converted into cyclic convolution and is equivalent to the product of the transform domain of the channel, a receiving end maps signals to the transform domain from a signal space domain through a two-dimensional FFT, single-tap equalization is achieved, and the signals are converted back to original signal space for judgment through the two-dimensional IFFT. A transform domain equalization technology has low processing complexity, can acquire the inherent joint multipath-Doppler diversity gain of the doubly selective channel, effectively counters channel fading, and improves the reliability of wireless communication.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for transform domain equalization of a VectorOFDM-based dual-selection channel. Background technique [0002] In wireless communication, the delay spread caused by multipath transmission aggravates the frequency selective fading of broadband transmission; at the same time, due to the high-speed movement of communication terminals, the Doppler spread caused by high mobility makes the channel change rapidly, resulting in time selective fading. The two work together to produce a dual-selective channel. The next-generation mobile communication system requires a high transmission rate, such as the fourth-generation mobile communication transmission data rate as high as 100Mb / s; at the same time, in order to support communication in a high-mobility environment, such as high-speed rail communication, the next-generation mobile communication system must adopt effective Mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/00H04L25/03
Inventor 罗茜倩张朝阳付攀玉钟财军
Owner ZHEJIANG UNIV
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