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Design method of dual codebook difference in LTE-A terminal feedback system

A technology of 1. LTE-A and feedback system, which is applied in the field of double codebook design based on Gleissmann differential coding, and can solve problems such as quantization errors

Active Publication Date: 2016-11-23
白盒子(上海)微电子科技有限公司
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Problems solved by technology

[0004] There have been many codebook design methods for the dual codebook structure, such as codebooks based on beam scanning, adaptive codebooks, and DFT codebooks. These methods are all based on fixed codebooks, and the codebooks will not change with the channel. and change, thus causing a large quantization error

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  • Design method of dual codebook difference in LTE-A terminal feedback system
  • Design method of dual codebook difference in LTE-A terminal feedback system
  • Design method of dual codebook difference in LTE-A terminal feedback system

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[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] A dual codebook differential design method in an LTE-A terminal feedback system. First, the mobile terminal selects a two-stage channel quantization codeword W according to the main characteristics of the channel. 1 , W 2 (dual codebook precoding matrix W=W 2 *W 1 ), feed back the precoding matrix indicator (Precoding Matrix Indicator, PMI) back to the base station side; then the base station calculates the precoding matrix by using the zero-forcing beamforming method according to the fed back PMI. Due to the introduction of demodulation-specific reference signals in LTE-A, the mobile terminal does not need to know the exact precoding matrix to accurately demodulate the data; 1 The codebook is rotated to track the main direction of the channel, for W 2 *W 1 The codebook is scaled to reduce the quantization error of the next feedback. This method makes full u...

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Abstract

The invention discloses a method for designing double-codebook difference in a LTE-A terminal feedback system. The correlation of the time and the space of a communication channel is fully utilized, a W1 codebook is rotated regularly according to a feedback precoding matrix indicator to better track the main direction characteristics of the communication channel, meanwhile, a W2*W1 codebook is zoomed to reduce the quantization error of the communication channel, and W = W2*W1 is used for expressing the communication channel information after quantization; a receiving end calculates a precoding matrix by using a zero-forcing beam forming method according to the feedback quantization communication information. According to the method, interference among multiple users is removed while low feedback overheads are guaranteed, and the overall performance of MIMO of the users is improved. Meanwhile, the precoding matrix is calculated according to the feedback quantization communication channel information, the interference among the users is removed, the performance of an MIMO system of the users is improved, and the performance gain is about 1-2dB when the signal to noise ratio is high.

Description

technical field [0001] The present invention relates to a design method of LTE-A physical layer multi-user MIMO precoding codebook, in particular to a dual codebook design method based on Gleissmann differential coding proposed for the terminal limited feedback system in LTE-A, belonging to Wireless Communication Technology. Background technique [0002] Due to the increasing shortage of spectrum resources, in order to pursue higher spectrum efficiency, the introduction of MIMO (Multiple-Input Multiple-Output) technology can significantly increase the channel capacity without increasing the bandwidth. With the deepening of multi-antenna technology research, MIMO technology has been extended from point-to-point single-user system to point-to-multipoint multi-user system. MIMO technology usually adopts the precoding technology at the transmitting end to improve the performance of the multi-user MIMO (Multi-user Multiple-Input Multiple-Output, MU-MIMO) system. The precoding-ba...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/16
Inventor 许威赵晶晶
Owner 白盒子(上海)微电子科技有限公司
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