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Method for selecting user with maximum product of effective channel gains in downlink multi-user multiple-input multiple-output (MIMO)
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A technology with equivalent channel and maximum channel gain, applied in diversity/multi-antenna system, space transmit diversity, advanced technology, etc., can solve the problems of high complexity and low system capacity
Inactive Publication Date: 2015-01-07
HARBIN INST OF TECH
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[0005] In order to solve the problem of low capacity and high complexity of the existing communication technology system, the present invention proposes a user selection method for maximizing the equivalent channel gain product of downlink multi-user MIMO
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specific Embodiment approach 1
[0036] Specific implementation mode 1. Combination figure 1 This embodiment will be specifically described. In the downlink multi-user MIMO maximum equivalent channel gain product user selection method described in this embodiment, in channel transmission, the base station has M transmitting antennas, and the receiving end has N user terminals, and each Each user is equipped with a single receiving antenna, and the channel between each user and the base station is H i ,
[0037] Among them, M and N are both positive integers, and M≤N; h i Indicates the channel between the i-th user and the base station, i=1,2,...,N;
[0038] The maximum equivalent channel gain product user selection method of downlink multi-user MIMO includes the following steps:
[0039] Step 1, initialization, Ψ k ={1,2,...,N}, k=0;
[0040] Among them, k represents the number of iterations, k=0,1,...,N; Ω k Indicates the user set selected after the kth iteration; Ψ k Indicates the optional user set...
specific Embodiment approach 2
[0057] Embodiment 2. The difference between this embodiment and the user selection method for maximizing the equivalent channel gain product of downlink multi-user MIMO described in Embodiment 1 is that in step 2, the user with the largest channel gain is selected, and the calculation is performed at The joint channel matrix H(Ω k ), the selected user set Ω k and an optional user set Ψ k The specific process is:
[0058] Select the maximum channel gain according to formula (31)
[0059] arg max i ∈ Ψ k | | h i | | - - - ( 31 )
[0060] The corresponding user u k , with this user as the first user,
[0061] According to formula (32), the joint channel matrix H(Ω k ),
[0...
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Abstract
The invention relates to a method for selecting a user with maximum product of effective channel gains in downlink multi-user multiple-input multiple-output (MIMO) and aims to solve the problems of low capacity and high complexity of the conventional communication technical system. The method comprises the following steps of: initializing; performing first iteration; performing kth iteration according to a formula, calculating a new combined matrix consisting of each user in an available user set and a (k-1)th iteration combined channel matrix after the (k-1)th iteration is performed, acquiring an effective channel gain of each user when the ith user is selected as a kth iteration user, acquiring the uk gain product of a user with the maximum product of effective channel gains, acquiring a uk combined channel matrix of the user with the maximum product of effective channel gains, and performing water injection power distribution on the combined channel matrix of the M selected users; and performing water injection power distribution on the combined channel matrix of the M selected users. The method is applied to the field of communication.
Description
technical field [0001] The present invention relates to a user selection method, in particular to a maximum product of effective channel gains (MPECG for short) user selection method for downlink multi-user MIMO. Background technique [0002] With the development of wireless communication technology and people's demand for high data transmission rate, the shortage of wireless spectrum resources has become the focus of many scholars. Multiple-Input Multiple-Out-put (MIMO for short) technology has attracted widespread attention from scholars because it can achieve high throughput while ensuring high spectrum utilization. In realizing downlink multi-user MIMO transmission, the key technology is to ensure that multiple users can transmit information at the same time without interfering with each other, so precoding technology has been proposed. [0003] Destination Point Code (DPC) technology is the optimal precoding scheme, which can eliminate the interference between multiple...
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