Code book selection method and apparatus capable of resisting feedback error

Abstract

The invention discloses a codebook selection method capable of preventing feedback error and a device thereof, which belong to the field of wireless communication and solve the problem that the prior codebook is liable to result in the mismatching between the beam used at the transmitting terminal and the current channel and the performance deterioration of the system. The embodiment of the invention provides a codebook selection method. The codebook comprises at least two code words and serial numbers corresponding to the at least two code words respectively. The method comprises the following steps: compiling codebooks of at least two kinds of relationship between code word and serial number; obtaining the transmission error parameter values of each codebook; and employing the codebook having the minimal transmission error parameter value as the common codebook shared by the signal transmitting terminal and the signal receiving terminal. The codebook selection method and the codebook selection device are applied to various antenna systems.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for optimizing a wireless communication transmission system. Background technique [0002] Among various multi-antenna technologies in the wireless communication field, the beamforming technology is simple to implement and can obtain a large signal-to-noise ratio gain and diversity gain, so it is widely used. In the beamforming system, the beam used by the transmitting end is determined according to channel state information (CSI, channel state information). However, in many cases, such as in a frequency division duplex (FDD, frequency division duplex) system, the transmitting end cannot directly obtain the CSI. At this time, the CSI is firstly quantized by the receiving end to determine a matching beam, and then the beam is transmitted to the sending end through a low-rate feedback channel. [0003] figure 1 Block diagram of the forward link for a qua...

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Problems solved by technology

[0005] In the process of realizing the feedback of the above-mentioned quantized beamforming vectors, the inventors found at least the following problems in the prior art: in the quantized beamforming system, the beams used by the transmitting end are fed back by the receiving end in the form of codeword serial numbers back

However, in the feedback process, the problem of codeword serial number feedback error often occurs, that is, the serial number of codeword A fed back by the receiving end, but an error occurs during the transmission process, causing the sending end to receive the serial number of codeword B

If the difference between codeword B and codeword A is large, the beam used by the sending end will not match the current channel, and the performance of the system will deteriorate

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