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

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...

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