Method, system and device for obtaining descending channel information

Abstract

The embodiment of the invention discloses a method, a system and a device for obtaining descending channel information. The method for obtaining descending channel information comprises the following steps: receiving a descending signal which is transmitted by a transmitting terminal and carries a descending pilot signal by a receiving terminal; demodulating the received descending signal, obtaining descending channel elements at the descending pilot signal, grouping the obtained descending channel elements according to the receiving antenna number of the receiving terminal and dividing the descending channel elements after grouping into a first subgroup of descending channel elements and a second subgroup of descending channel elements; and superimposing every group of descending channel elements in the first subgroup of descending channel elements on an ascending pilot signal after respectively multiplying by one orthogonal code, obtaining a mixed pilot signal and transmitting the mixed pilot signal to the transmitting terminal by an ascending pilot channel of the receiving terminal so as to enable the transmitting terminal to obtain the descending channel information. The embodiment of the invention enables the transmitting terminal to obtain the complete descending channel information.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of wireless communication, and in particular to a method, system and device for acquiring downlink channel information. Background technique [0002] In a wireless communication system, the transmitted signal is affected by the channel during transmission, and fading and distortion will occur. In order to recover the transmitted signal, the receiving end usually needs to estimate the physical transmission channel, and eliminate the influence of the channel on the transmitted signal through an equalization method. A schematic diagram of a typical wireless communication system transmitting and receiving is shown in figure 1 shown. [0003] The defect of this transmitting and receiving structure is that the effect of channel estimation and equalization will be affected by noise, for example: zero-forcing equalizer will lead to noise amplification in the case of low signal-to-noise ra...

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Problems solved by technology

[0006] However, the inventors found the following problems in estimating the downlink channel information by using the sounding signal: when the number of receiving antennas of the terminal is greater than the number of transmitting antennas, the downlink channel information estimated by using the sounding signal is only the downlink channel information of some antenna pairs

[0013] (3) The number of codebooks is limited, and the quantization error of the codebook greatly affects the performance of precoding

[0014] (4) If it is necessary to ensure that the transmitter can obtain sufficient downlink channel information, the overhead of uplink feedback signaling is huge

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