Transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing)

A transform domain and selectivity technology, applied in digital transmission system, electrical components, error prevention, etc., can solve the problems of inability to obtain dual selection channels and high complexity

Active Publication Date: 2013-12-04
ZHEJIANG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the high complexity of the prior art and the shortcoming that the inherent multipath-Doppler divers...

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  • Transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing)
  • Transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing)
  • Transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing)

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Embodiment Construction

[0065] The transformation domain multiplexing method of the dual-selective channel based on VectorOFDM is as follows: the sending end converts the serial-parallel transformation of the convolutionally encoded transmission signal into a matrix form, and performs two-dimensional IFFT on the matrix, and then adds two-dimensional CP / ZP Get the extended matrix, use VectorOFDM modulation, map the matrix to the time-frequency domain and send it; the received signal is first demodulated by VectorOFDM, and then the transform domain signal is obtained through two-dimensional FFT, and after equalization by a single-tap filter, the original transmitted signal is obtained Estimated value, and finally decoded;

[0066] 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...

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Abstract

The invention discloses a transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing). In wireless communication under a fast moving environment, information channels need to go through severe double selective fading. Signals are transmitted to a transform domain at the transmitting end to perform two-dimensional IFFT and Vector OFDM modulation, obtained time-frequency domain signals are transmitted, the Vector OFDM is used at the receiving end for demodulation, two-dimensional FFT transform returns to the transform domain, receiving signals of the transform domain equal to two-dimensional FFT products of BEM matrixes of original transmitting symbols and information channels, and transform domain signals are orthogonal during transmission of double selective information channels, so that balancing of the information channels can be achieved only by a equalizer of a single tap. In addition, a certain coding or pre-coding structure is needed for resisting information channel deep fading. The transform domain reusing method is low in processing complexity, meanwhile can obtain inherent combined multipath-doppler diversity gain of the double selective information channels, can effectively resist information fading and improves reliability of wireless communication.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a transformation domain multiplexing method based on VectorOFDM dual selective channels. Background technique [0002] In wireless communication, the delay spread caused by multipath transmission aggravates the frequency selective fading of broadband transmission, resulting in serious intersymbol interference; at the same time, due to the high-speed movement of communication terminals and the Doppler spread caused by high mobility, the channel changes rapidly. lead to time-selective fading. Under the joint action of the two, time dispersion and frequency dispersion occur in the channel, resulting in double selective fading. 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 enviro...

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Application Information

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IPC IPC(8): H04L27/26H04L1/00
Inventor 罗茜倩张朝阳付攀玉钟财军
Owner ZHEJIANG UNIV
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