Demodulation method and demodulator of orthogonal frequency division multiplexing-multiple-input-multiple-output (OFDM-MIMO) system

Abstract

The invention relates to a demodulation method and a demodulator of an OFDM-MIMO system. The demodulation method comprises the following steps: firstly, estimating a channel estimation value of reference signal subcarriers on each channel by utilizing a received reference signal; secondly, acquiring an orthogonal matrix of the reference signal subcarriers by using the channel estimation value; thirdly, acquiring orthogonal matrixs on all data subcarriers by carrying out calculus of interpolation by using the acquired orthogonal matrix; fourthly, calculating an intermediate evaluation value of transmitter data by using data signals received on all data subcarriers and corresponding orthogonal matrixs; and fifthly, decoding the precoded intermediate evaluation value of the transmitter data by using a precoding matrix to acquire a final transmitter data evaluation value. The demodulator comprises an OFDM demodulation module, a frame analytic module, a precoding matrix generation module, a part channel estimation module, a part orthogonal matrix generation module, an orthogonal matrix interpolation module, an MIMO demodulation module and a precoding decoding module. The demodulation method and the demodulator can reduce the complexity of an OFDM-MIMO receiver.

Description

technical field [0001] The present invention relates to a demodulator method, in particular to a demodulation method and a demodulator in an Orthogonal Frequency Division Multiplexing (OFDM)-Multiple Input Multiple Output (MIMO) communication system. Background technique [0002] With the increasing demand of mobile communication users, high data rate and high spectrum efficiency are becoming one of the main requirements of mobile communication systems, and the corresponding advanced technologies, such as OFDM technology and MIMO technology, have also become the mainstream of current broadband mobile communication systems The supporting technology has been developed and applied in many practical systems, such as WiMax, LTE[1] and so on. [0003] figure 1 is a schematic diagram of a classic OFDM-MIMO transmitter; without loss of generality, two transmitting antennas are taken here as an example. In the i-th symbol, the data symbol X of the two signals 0 [i, k], x 1 [i, k]...

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Problems solved by technology

[0041] The problem with the above receivers is that the amount of calculation is large, especially the amount of calculation for solving the equalization matrix is ​​very large

[0042] For modern broadband high-speed data systems, to ensure higher throughput and better real-time performance, the above complex algorithms require a lot of calculations, which may lead to higher receiver power consumption and higher receiver costs

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