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A transmission optimization method based on convex optimization theory

A transmission optimization and convex optimization technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems such as direct optimization difficulties, and achieve the effect of reducing MSE

Inactive Publication Date: 2017-09-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] CB problem 1. Under the premise of limiting the transmission power of each cell, minimize the total MSE sum of the system in the worst case:
[0011] CB problem 2. Under the premise of limiting the transmission power of each cell, minimize the maximum MSE of the user in the worst case of the system:
[0025] It is known that the channel error is bounded, that is, but it cannot be concluded that bounds, it is difficult to directly optimize

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  • A transmission optimization method based on convex optimization theory
  • A transmission optimization method based on convex optimization theory
  • A transmission optimization method based on convex optimization theory

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Embodiment Construction

[0084] The present invention will be further described below in conjunction with embodiment.

[0085] The optimization problem in the actual scene is simulated, and all the simulation results come from the convex optimization toolkit CVX. The parameters in the simulation are set as: 2 cells (M=2), each cell contains 2 users (K=2), power constraint P max =1. Each base station has 2 transmit antennas (N t = 2), each user has 1 receiving antenna (N r =1), the data flow is 1(L m,k = 1). All the simulation results come from the average of 1000 times to generate the estimated channel, and the real and imaginary parts of the estimated channel obey distributed.

[0086] In the CB scenario, for two optimization problems, when the channel estimation has no error and the CSI error bounds are as well as When , the optimal precoding matrix and receiver are obtained, and the worst-case total MSE of the system and the maximum MSE of the user are calculated, such as Figure 4 an...

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Abstract

The present invention proposes a robust transmission precoding optimization method based on convex optimization for the downlink channel of a TDD-MIMO system. Since the channel reciprocity error is within a certain range, the user's SINR will also be limited within a certain range to ensure that the user's worst SINR is maximized in this case. Using the proposed optimization scheme, it can be obtained to support a wide range of robustness A framework for the purpose of sex transfer optimization, and an iterative algorithm based on positive semidefinite problems. Through the above scheme, the present invention uses the idea of ​​convex optimization to solve the problem, and with the help of the convex optimization toolkit, the optimal solution can be obtained more easily and quickly, and the system capacity can be improved.

Description

technical field [0001] The technical field of wireless communication of the present invention relates in particular to a kind of time division duplexing-multiple-input multiple-output (TimeDivision Duplexing-Multiple-Input Multiple-Output, TDD-MIMO) system, aiming at the situation of channel reciprocity error, adopting based on The transceiver design scheme of the convex optimization theory processes the data sent by the downlink channel. Background technique [0002] With the development of wireless communication, it is required that the wireless network can accommodate more users, the system capacity will be larger, and the user service quality will be better. The goal of the future wireless communication system is to provide various High-quality high-speed service. In the downlink of a multi-cell MIMO system, the interference problem has become a major obstacle to the improvement of system performance by multi-antenna technology in wireless communication. One base statio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 刘佳罗辑张忠培
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA