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Pre-encoding codeword determining method, system and apparatus

A precoding and codeword technology, applied in the field of precoding codeword determination methods, systems and devices, can solve problems such as needs and achieve the effect of reducing the amount of feedback

Active Publication Date: 2009-05-06
TD TECH COMM TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that by reducing the size of the codebook, the PMI is changed from 4 bits to 2 bits, thereby reducing the amount of PMI feedback, but this method still requires 2 bits of PMI information feedback each time

Method used

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  • Pre-encoding codeword determining method, system and apparatus
  • Pre-encoding codeword determining method, system and apparatus
  • Pre-encoding codeword determining method, system and apparatus

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Embodiment Construction

[0060] In the embodiment of the present invention, considering that the difference between the uplink and downlink channels of the TDD system is small, that is, the uplink and downlink channels have reciprocity, the base station takes advantage of the uplink channel to obtain downlink channel information, so that the base station can correctly Select the precoding codeword for the downlink channel. During specific implementation, the feedback condition can be preset, and the feedback condition is used to perform PMI feedback by the terminal when the optimal codeword selected by the base station and the terminal cannot be guaranteed to be consistent. Afterwards, the base station performs channel estimation on the uplink channel, and the terminal performs channel estimation on the downlink channel; the terminal determines the optimal codeword matching the channel from the code book according to the downlink channel estimation result, and uses the determined optimal codeword as th...

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Abstract

The invention discloses a precoding code determining method which comprises the following steps: a base station carries out channel estimation to an uplink channel, and a terminal carries out downlink channel estimation to a downlink channel; the terminal determines an optimal code matched with the channel from a code book according to the estimation result of the downlink channel, and when the predetermined feedback condition is satisfied, the optimal code is used as the precoding code required by the next transmission and instructs the optimal code to a base station by the precoding matrix instruction; when the base station receives the PMI from the terminal, the precoding code used in the next transmission is determined from the code book according to the PMI; or else, the base station determines the optimal code matched with the uplink channel from the code book according to the estimation result of the uplink channel and determines the optimal code as the precoding code used by the next transmission. In addition, the invention also discloses a system and a device used for determining the precoding codes. The technical scheme disclosed by the invention can reduce the feedback amount of the PMI.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a method, system and device for determining a precoding code word applied to a Time Division Duplex (TDD) system. Background technique [0002] With the development of wireless communication technology, multiple-input multiple-output (MIMO) multi-antenna technology, as a method of converting space-domain signal processing to beam-domain signal processing, can bring high processing gain to the system and has become the third It is one of the important technologies for the evolution system of the first-generation mobile communication system and the next-generation mobile communication system. [0003] In the application of MIMO technology, considering that it requires a huge signaling overhead for the user terminal to feed back the channel coefficients of each antenna, it is decided to pre-design the coefficients corresponding to all possible MIMO channel conditions into...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/26
Inventor 刘臻张建华李佳宁张平黄江春黄琛王大飞拉盖施
Owner TD TECH COMM TECH LTD
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