Signal detection method and system, transmission device and receiving device

Abstract

The invention provides a signal detection method which comprises the following steps: a transmitting device converts signals needed for transmission into a plurality of symbol subflows the number of which is the same with that of transmitting antennas; the symbol subflows are respectively modulated; modulated results are respectively coded differentially; space-time code matrixes are constructed by utilization of differential coding symbols and respectively transmitted in continuous moments through the transmitting antennas; a receiving device receives the space-time code matrixes which are transmitted by the transmitting device, and signals after filtration are obtained by filtering the space-time code matrixes; the signals after filtration are judged differentially, and symbols which are generated by modulation of the transmitting device are obtained; after demodulation of the symbols, the symbol subflows which are transmitted by the transmitting device are obtained and then converted into signals which are transmitted by the transmitting device. Channels are unnecessary to estimate through the signal detection method and a signal detection system which are provided by an embodiment of the invention, thereby broadband resources are effectively saved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a signal detection technology of a multi-antenna communication system. Background technique [0002] With the development of wireless communication technology and the diversification of information requirements, pure voice services have developed into multimedia services. However, multimedia services are restricted by various factors such as spectrum resources, transmission power, and multipath fading. Among them, the spectrum resource utilization rate is directly related to the capacity of the wireless communication system. In order to effectively improve the spectrum utilization rate of the wireless communication system, a Multiple Input Multiple Output (MIMO, Multiple Input Multiple Output) system is proposed. In this system, multiple transmitting antennas and multiple receiving antennas are used to send and receive signals. According to the different positions of t...

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Problems solved by technology

[0018] However, the coherent detection method based on the V-BLAST structure above needs to obtain channel state information (CSI, Channel State Information) in order to perform channel estimation. However, in high-speed mobile or antenna When the number is large, it is difficult for the receiving end of the distributed MIMO system to obtain accurate channel state information, and multi-antenna channel estimation needs to transmit training sequences for channel estimation, which requires additional broadband resources. The larger the number of antennas, the larger the bandwidth occupied. more resources

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