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Partial user feedback method in multiuser multiple input multiple output analog feedback system

A multi-input multi-output, feedback system technology, applied in the field of partial user feedback based on analog feedback, can solve problems such as large feedback overhead and unsuitable application

Inactive Publication Date: 2009-10-21
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, this method requires all users in the system to feed back their channel state information in each time slot. In the case of a large number of users, it will still bring huge feedback overhead, so it is not suitable for application in practical systems.

Method used

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  • Partial user feedback method in multiuser multiple input multiple output analog feedback system
  • Partial user feedback method in multiuser multiple input multiple output analog feedback system
  • Partial user feedback method in multiuser multiple input multiple output analog feedback system

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Embodiment 1

[0039] This embodiment adopts a downlink multi-user MIMO system with the number of users K=500. It is assumed that each user channel vector obeys the independent and identically distributed Rayleigh distribution, and the signal-to-noise ratio of data transmission is set to 10dB, the transmission power of uplink channel training symbols and analog feedback signals is 8 watts, and the noise power is 1 watt. The base station is configured with M=4 transmitting antennas, and each user is equipped with 1 receiving antenna. So each user's channel h k Both are a 1×4 dimensional vector. Let the number of users actually participating in the feedback be U′.

[0040] The specific operation steps are as follows:

[0041] Steps for the base station to determine the decision threshold value of the analog feedback:

[0042] According to the chi-square distribution characteristics of the number of users in the current serving cell K=500, the number of base station antennas M=4, the averag...

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Abstract

The invention discloses a partial user feedback method based on a multiuser multiple input multiple output analog feedback system. The method is characterized in that a base station calculates the feedback decision threshold of a user down channel module value and passes the threshold to all users according to the total number of users in the present service community, the number of antennae in the base station, the average feedback user number allowed by an up channel and square distribution feature of the down channel module; the down channel of users that agree with the threshold is fed back to the base station at each time slot in the manner of analog feedback; the base station obtains the down channel of users from the received user analog feedback signals by estimation according to least mean square; and the base station only carries out selection of transmitting user set among the users of feedback analog signals. The method reduces the tremendous feedback overhead generated by analog feedback under multiuser environment, obtains the total throughout rate with less loss than all users participating in the analog feedback and is suitable for the use in a practical system and reduces use cost.

Description

technical field [0001] The invention belongs to the technical field of multi-user multiple-input multiple-output systems in wireless communication, and in particular relates to a partial user feedback method based on analog feedback in multiple-input multiple-output systems. Background technique [0002] The multi-user selective space division multiplexing method in the downlink MIMO system is an effective method to improve the throughput of the wireless communication system. However, this method requires all users to feed back high-quality user channel state information to the sender, which will bring a lot of feedback overhead in a multi-user environment. [0003] "International Institute of Electronics and Electrical Engineers Signal Processing" (IEEE Transactions on Signal Process, Vol.54, No.4, Nov.2006, pp.1268-1278.) proposed a multi-user MIMO system based on simulation The analog feedback method of linear modulation feedback channel state information can greatly red...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L25/02
Inventor 孙栋邱玲
Owner UNIV OF SCI & TECH OF CHINA
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