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Game theory-based power control method of multi-antenna CDMA system

A technology of code division multiple access and power control, which is applied in the direction of transmission control/equalization, transmission system, digital transmission system, etc. It can solve the problems of not considering the fairness of users in the system, not considering the large-scale loss, etc.

Inactive Publication Date: 2008-12-10
PLA UNIV OF SCI & TECH
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Problems solved by technology

This paper proposes a power allocation scheme that minimizes the average bit error rate at the transmitter. Since the article only considers the case of a single user, it is not a distributed optimization problem, so it does not consider large-scale losses. That is, it does not consider the fairness among users in the system

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  • Game theory-based power control method of multi-antenna CDMA system
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  • Game theory-based power control method of multi-antenna CDMA system

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Embodiment Construction

[0033] Step 1: In a single-cell multi-antenna MIMO CDMA system with N users, each user is equipped with Mt transmitting antennas, and the base station has Mr receiving antennas. In a certain time slot, suppose the system Each user in can access, and the initial transmission signal power value of each user is p ini , and the target SINR of all users is γ tar ;

[0034] Step 2: The signal to be sent by user i is x i (i=1, 2, ... N), pre-encode it before sending it, and get the encoded signal x' i , expressed as x′ i =w i x i ,w i is the precoding vector of user i, and the user performs spread spectrum and identical modulation on the transmitted signal independently on each transmit antenna;

[0035] Step 3: The received signal r obtained at the base station can be expressed as:

[0036] r = Σ i = 1 N H i x ...

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Abstract

A solving method of the power control based on the game theory in the multi-antenna code division multiple access system is disclosed, wherein a game function based on the receiving end average bit error rate is designed, to realize the minimum of the user union transmitting power and the bit error rate, meanwhile, a punishment mechanism is inducted based on the link quality and the transmitting power to solve the 'far and near effect' in the CDMA system, and the punishment factor is adjusted real-time according to the different operation requirement. Each user performs the precoding treatment on the signal, divides the signal at the receiving end into N branches for processing. Each branch is multiplied by a receiving vector corresponding to the precoding vector, to cause the information update only depending on the feedback of part channel state information. The transmitting power and the signal to interference and noise ratio of each iteration by the user is computed, and the feasibility judgement is completed, till the obtained transmitting power through two times of iteration by the user satisfies that the 2-norm is smaller than the given small number after being adjusted continuously, the algorithm jumps out of the iteration cycle.

Description

technical field [0001] The present invention relates to a solution for distributed power control in a multi-antenna multiple-input multiple-output code division multiple access (MIMO-CDMA) system, specifically a designed power control model based on game theory To model the power control of the uplink in the multi-antenna MIMO code division multiple access system, so as to solve the distributed power control problem in the system. Background technique [0002] As the key technology of the third generation mobile communication, Code Division Multiple Access (CDMA) technology has received extensive attention. In a CDMA system, since users share the same frequency band and there is a non-ideal correlation between the spreading codes of each user, the transmit power of the users will directly affect the total capacity of the system. It should be noted that in a cellular CDMA system, the channel attenuation of nearby users may be very different from that of cell-edge users, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04L1/06H04L1/00H04L25/03
CPCY02D30/70
Inventor 喻的雄蔡跃明吴丹潘成康钟卫
Owner PLA UNIV OF SCI & TECH
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