Method and apparatus for space division multi-access based on limited feedback restriction

Abstract

A method based on a limited feedback limit in a space division multiple access system and a device thereof are used in the technical field of wireless transmission. The method comprises the followingsteps: 1. obtaining a vector quantization error distribution function according to the number of subsets of a codebook in a system codebook and the number of transmitting antennas; 2. setting a corresponding vector quantization error threshold and a channel gain threshold according to the total number of feedback bits supported by the system, the total number of users, the number of the transmitting antennas and the vector quantization error distribution function; 3. quantizing channel direction information and channel quality information of the users, and recording a vector quantization errorof the channel direction information; and 4. feeding back channel state information in which the vector quantization error is smaller than the threshold, and the channel quality information is higherthan the channel gain threshold. The device comprises a receiving terminal device and a sending terminal device matched with the receiving terminal device. The method and the device improve the accuracy of the feedback rate control, have stable performance and are easy to be realized.

Description

technical field [0001] The present invention relates to an orthogonal beamforming method and device in the technical field of wireless transmission, in particular to a method and device for a space division multiple access system based on limited feedback restriction. Background technique [0002] As the core technology of the next-generation mobile communication (4G) system, MIMO technology can effectively improve diversity gain, increase system capacity, and meet the basic requirements of users for high-speed data transmission. In the mobile communication system, it is necessary to provide services for multiple users at the same time. For the MIMO downlink system, that is, the broadcast channel, in order to improve the multiplexing gain and make the system capacity linear with the number of base station transmitting antennas, space division multiple access can be used. (SDMA) mode, which has been adopted by the IEEE 802.16e standard, and has also been submitted to the 3GPP...

AI Technical Summary

Problems solved by technology

[0003] According to the literature search of the prior art, in the SDMA method based on partial channel state information, "SDMA with a sum feedback rate constraint" published by KaibingHuang et al. in "IEEE Transactions on Signal Processing" (Signal Processing) No. "(Space Division Multiple Access under Feedback Rate Limitation), this paper proposes an SDMA technology based on orthogonal beamforming - single basic stream user and rate control (PU2RC), the specific method is: multi-user beamforming vector from multiple Selected from the codebook of four orthogonal beamforming vector sets, the vector quantization error of the user is lower than the error threshold, and the channel state information is fed back only when the channel gain is higher than the gain threshold, thereby controlling the number of feedback users. The disadvantage is: the vector quantization error threshold The setting of is based on an incomplete formula for the vector quantization error distribution and cannot precisely control the feedback rate

Images