Multi-antenna receiver design based on orthogonal time-frequency air conditioning

Abstract

The invention discloses a multi-antenna receiver scheme based on orthogonal time-frequency space (OTFS) modulation. The method comprises the steps of forming a plurality of parallel branches by time domain signals reaching a receiving end antenna array through a beam forming network, presenting high spatial resolution passing through the beam forming network, preliminarily separating multipath components in the received signals from a spatial domain, and sparsity of equivalent channels of the parallel branches is improved; further proposing to counteract residual Doppler frequency shift of each branch by OTFS demodulation of each branch signal formed by the beamforming network, and obtaining a receiving signal of a time delay Doppler domain; designing an MP-MRC (Message Transfer-Maximum Ratio Combination) joint iterative detection network to obtain an optimal spatial diversity gain and accelerate the convergence rate of the iterative network; and the time delay Doppler domain receivingsignals and the equivalent channel matrixes of all the branches pass through the designed MP-MRC joint iterative detection network, and signals after equalization detection are output.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a multi-antenna receiver design based on orthogonal time-frequency-space (OTFS) modulation. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) modulation technology is one of the most widely used communication technologies in current communication systems, and it is mainly used to combat inter-symbol interference (ISI) caused by channel multipath effects. ), and can achieve high-speed data transmission. [0003] However, future wireless communication networks, such as B5G / 6G, will face a communication channel environment with high Doppler expansion, such as high dynamic communication scenarios (such as high-speed rail, Internet of Vehicles) and millimeter wave communication. Channels in these scenarios will show double dispersion properties, including time dispersion due to multipath effects and frequency dispersion due to Doppler spread. The OFDM ...

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Problems solved by technology

However, its complexity depends heavily on the sparsity of the channel. In some practical communication scenarios, such as high dynamic communication in urban areas, mountainous areas or tunnel environments, due to the existence of a large number of multipath components in the channel, a large number of Doppler Doppler frequency offsets (DFOs), this phenomenon leads to a serious reduction in the sparsity of the channel, which in turn greatly increases the complexity of MP, making it difficult to be applied in actual communication

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