Multi-antenna pilot mapping method

Abstract

The invention discloses a multi-antenna pilot frequency mapping method by aiming at a second frame structure of a long-term evolution system. A base station sends control information to a mobile terminal by precoding according to a request of the terminal; the mobile terminal computes a channel matrix according to a resource block in the control information, and feeds the obtained channel information to the base station; the base station determine a multi-antenna processing mode used by the data channel according to the channel information, and sends the control information of the multi-antenna processing mode to the mobile terminal; the base station sends information of the data channel by the multi-antenna processing mode, and inserts the pilot frequency with a pilot frequency structurecorresponding to the multi-antenna processing mode; and the mobile terminal estimates the control channel and the data channel by the multi-antenna processing mode and the corresponding pilot frequency structure, and finishes decoding of the received data. The method supports space division multiplexing of multi-beams and improves a cell throughput; and the base station smartly selects an MIMO mode used by the mobile terminal according to the condition of the channel.

Description

technical field [0001] The present invention relates to a long term evolution (Long term evolution, LTE for short) system, in particular to a multi-antenna pilot mapping method in the LTE system. Background technique [0002] Beamforming can increase cell coverage, improve the link performance of cell edge users, and can eliminate spatial interference and increase system capacity. It is one of the main multiple-input multiple-output (MIMO) methods in LTE wireless communication systems. figure 1 It shows the working principle of the LTE system transmitter. After the user's information bits are modulated, the modulation symbols and the resources allocated to the UE (User Terminal) should be set to the specified RB size, and then after multi-antenna processing, according to the common pilot The pattern is inserted into the common pilot sequence, and after OFDM transformation, it is transmitted from the base station antenna. After receiving the signal, the UE side performs OFDM...

AI Technical Summary

Problems solved by technology

In order to ensure omni-directional coverage, the common control channel cannot use common pilots, the coverage of the data channel using beamforming is greater than the coverage of the control channel, and the coverage of each symbol in one RB will be different, even if power boosting is used to expand Coverage will also make the operation of the system very complicated due to repeated changes in the transmit power in one RB, and the distortion of the symbols at both ends due to power mutations will also greatly affect the performance of the system

Even if symbol repetition is used to improve the coverage of the control channel, on the one hand, the overhead of control signaling is greatly increased, and it is difficult to ensure stable coverage of the control channel.

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