Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for limiting feedback of feedback code word space threshold of multi-user multi-aerial system

A multi-user, multi-antenna, and spatial distance technology, applied in the field of limited feedback, can solve the problems of improving system performance, not making full use of multi-user diversity scheduling gain, and not considering multi-user interference information, so as to improve the average throughput and improve the system Average throughput rate, the effect of increasing the average throughput rate

Inactive Publication Date: 2012-09-19
UNIV OF SCI & TECH OF CHINA
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the precoding matrix index and channel quality indication information fed back by the receiving end do not consider the multi-user interference information, the base station cannot properly select the multi-user pairing set for multi-user space division multiplexing transmission
Therefore, the precoding matrix feedback method of the existing Release 8 protocol cannot fully utilize the multi-user diversity scheduling gain to improve system performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for limiting feedback of feedback code word space threshold of multi-user multi-aerial system
  • Method for limiting feedback of feedback code word space threshold of multi-user multi-aerial system
  • Method for limiting feedback of feedback code word space threshold of multi-user multi-aerial system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment is applied to a MIMO-OFDM system. The base station adopts a codebook-based precoding scheme. Two users are allowed to be called on each time-frequency resource block, and multiple transmitted data streams are irrelevant; each user calculates the precoding scheme. The coding matrix index PMI and the code word space distance threshold CDRT, as well as the corresponding single-user CQI and multi-user CQI, are fed back to the base station; the base station performs user scheduling pairing for each resource block according to the feedback information of each user, and sends a signal; each The user adopts the Minimum Mean Square Error Interference Cancellation (MMSE-IC) scheme for reception.

[0014] By introducing the codeword space distance threshold, the user's feedback process includes the following two steps:

[0015] 1) Select the optimal precoding matrix for a single user, indicated by PMIk. For each user, according to the channel matrix H obtained by ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for limiting feedback of a feedback code word space threshold of a multi-user multi-aerial system which is characterized in that each user feeds back a code word space threshold to a base station in order to limit a code word assemble which has a bigger code word distance indicated by a chosen pre-encoder matrix index and feeds back a corresponding multi-user channel quality indication. The base station matches users and transmits according to fair pro rata principle based on the code word space threshold reported by each user and the pre-encoder matrix index.Feedback for the code word space threshold takes full advantage of multi-user diversity scheduling gain, needs lower additional feedback overhead, greatly promotes an average throughput rate of the system, increases little complexity and is easily realized in an actual system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication multi-user multiple-input multiple-output systems, and in particular relates to a limited feedback method for a receiving end to feed back a precoding matrix index to a base station in a codebook-based precoding manner. Background technique [0002] The Release 8 (Rel-8) protocol (3GPP TS 36.213v8.7.0, 7.1.5.Multi -userMIMO scheme, 2009-05, pp22 and 3GPP TS 36.211v8.7.0, 6.3.4.2.1. Precoding without CDD, 2009-05, pp52), multi-user MIMO spatial multiplexing transmission can use a single In the multi-codeword precoding method based on the codebook of the data stream, the precoding matrix is ​​obtained at the receiving end, and the precoding matrix index is fed back for selection by the base station. Compared with the single-user transmission mode, when the multi-user spatial multiplexing transmission of each user's single data stream (Rel-8Rank=1) is adopted in the Release 8 protocol, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06
Inventor 邱玲孙栋柏云凤
Owner UNIV OF SCI & TECH OF CHINA