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Doubly selective channel transform domain equalization method 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: 2013-11-27
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 Vector OFDM dual selective channels

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  • Doubly selective channel transform domain equalization method based on Vector OFDM
  • Doubly selective channel transform domain equalization method based on Vector OFDM
  • Doubly selective channel transform domain equalization method based on Vector OFDM

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Embodiment Construction

[0067] The transform domain equalization (TrDE: Transform Domain Equalization) method of the dual selective channel based on Vector OFDM is: the transmitter serially transforms the signal to be sent into a matrix form, and adds a two-dimensional cyclic prefix CP or zero padding ZP to obtain an extended matrix , And then use Vector OFDM modulation to map the matrix to the time-frequency domain and send it. The received signal is first demodulated by Vector OFDM, and then the transform domain signal is obtained by two-dimensional FFT. After equalization by a single-tap filter, it is obtained by two-dimensional IFFT. Estimated value of the original transmitted signal;

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

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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 present invention relates to the field of wireless communication, and in particular to a transform domain equalization method of dual selective channels based on Vector OFDM. Background technique [0002] In wireless communication, the time delay expansion caused by multipath transmission exacerbates the frequency selective fading of broadband transmission; at the same time, the Doppler expansion caused by the high-speed movement of the communication terminal and the high mobility causes the channel to change rapidly, leading to time selective fading. The two work together to produce dual selective channels. The next-generation mobile communication system requires a very high transmission rate, such as the fourth-generation mobile communication transmission data rate up to 100Mb / s; at the same time, in order to support communication in a high-mobile environment, such as high-speed rail communication, the next-generation mobile communication system must ...

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Application Information

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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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