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Space-time grouping code downriver transmitting power distributing method based on error sign ratio

A space-time block code and symbol error rate technology, applied in the field of downlink transmission power allocation, can solve problems such as feedback error and delay, system performance degradation, and large system overhead

Inactive Publication Date: 2009-07-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a given user, how to choose a distributed antenna to communicate with it is a problem that must be solved. If the number of antennas is too small or too many, the performance of the system may be degraded. We need to determine the best set of transmitting antennas
Since all channel information is known at the receiving end, using all channel information to select the antenna set and adjust the power rate at the sending end requires the feedback of channel information from the receiving end to the sending end, which will increase a lot of system overhead. and is susceptible to feedback errors and delays

Method used

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  • Space-time grouping code downriver transmitting power distributing method based on error sign ratio
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  • Space-time grouping code downriver transmitting power distributing method based on error sign ratio

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Embodiment Construction

[0033] The method for distributing downlink transmission power suitable for space-time block codes in a distributed wireless communication system proposed by the present invention is characterized in that, for a single-user distributed wireless communication system, there are n base station antennas and m user antennas. The n antennas are arbitrarily divided into l clusters that are scattered in space, and the number of antennas in the jth cluster (j=1,...,l) is q j. It is assumed that the transmit antennas within different clusters are correlated to a certain degree, and the receive antennas are also correlated. A transmission scheme STBC using space-time block codes. The same power is transmitted within the same cluster, and between different clusters, the power allocation is carried out at the transmitting end according to the information fed back from the receiving end, so that the average SER of the system is minimized.

[0034] The purpose of power allocation at the se...

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Abstract

The invention relates to a method for distributing descending sending power in space time divided code in distribution wireless communication system. Wherein, it is characterized in that: the sender based on character values of relative matrixes of sending and receiving antenna feedback from the receiver realizes the optimized distribution of power, to minimize the average error code rate when group Ai transmits MQAM and MPSK code. The invention uses less signal channel state information, to selectively send antenna combination and optimized distribute the power. Compared with full power sending, it has improved property.

Description

technical field [0001] The invention belongs to the technical field of downlink transmission of wireless communication, and in particular relates to a downlink transmission power allocation method suitable for a space-time block code transmission scheme of a distributed wireless communication system. Background technique [0002] The State Key Laboratory of Microwave and Digital Communications of Tsinghua University proposed the concept of distributed wireless communication system for the first time, namely: using the framework of distributed antenna, distributed optical fiber, distributed computing and distributed network to realize a new generation of wireless communication. The distributed wireless communication system adopts distributed antenna and distributed processing structure, so the traditional cell division mechanism based on geographic location no longer exists, and is replaced by virtual cells based on users. Specifically, the channel gain from each distributed ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04B7/06H04Q11/06
CPCY02B60/50Y02D30/70
Inventor 王京周世东韩双锋粟欣肖立民钟晓峰甘剑松
Owner TSINGHUA UNIV