Orthogonal air time precoding transmission method based on distributed antenna system
A technology of distributed antenna, transmission method, applied in baseband system components, shaping network in transmitter/receiver, preventing/detecting errors through diversity reception, etc., can solve the problem of low power efficiency, narrow application range, performance Large losses and other problems, to achieve the effect of reducing the amount of feedback, simple design, and avoiding design
Inactive Publication Date: 2010-11-03
ZHEJIANG UNIV
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[0004] The purpose of the present invention is to solve the problems of narrow application range, low power efficiency, and relatively large performance loss compared with the theoretical upper limit in the above scheme, and propose a transmission method for orthogonal space-time precoding based on a distributed antenna system
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[0039] The block diagram of a distributed antenna system is shown in figure 1 As shown, the base station has N t Antennas are distributed in the whole cell, and they are connected with the central processing unit by optical fiber, and the mobile terminal has N r Root centralized antenna, therefore, the distributed MIMO channel H can be expressed as H w P pathloss P shadow , where Hw In the fast fading part of the channel, each element of it obeys CN(0,1) distribution and is independent of each other, P pathloss Represents the path loss, which is a definite function of the distance between the transmitting and receiving antennas, so it is an N t ×N t The positive definite diagonal matrix of P shadow Indicates shadow fading, which is also an N t ×N t The positive definite diagonal matrix of , each diagonal element obeys the lognormal distribution.
[0040] Orthogonal space-time precoding transmission method based on distributed antenna system.
[0041] Including the fo...
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The invention discloses an orthogonal space-time pre-coding transmission method which is based on a distributed antenna system. According to the characteristics of a distributed multiple-input multiple-output channel, two restricted designed quantization sub-code books are stored at the two ends of transmitter and receiver. A moving end predicts a channel state message when a base station transmits signals according to an obtained channel estimated value. Based on the channel predicted values and according to the pairing error probability rule of the minimized orthogonal space-time pre-coding, the moving end chooses an optimal quantization codeword for fast fading and shadow fading respectively, and then feeds back the serial number of the two code words to the base station. After receiving the feedback message, the base station restores a corresponding quantization code word which creates a pre-coding direction matrix with the existing path loss message, and at the same time, the base station calculates a corresponding power distribution factor according to a mixed power distribution method, thus further improving the reliability of the transmission. The invention provides a simple and effective pre-coding transmission method for the distributed antenna system.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to an orthogonal space-time precoding transmission method based on a distributed antenna system. Background technique [0002] With the development of wireless communication technology, users have higher and higher requirements for various data services. Because multi-antenna technology can provide high spectrum efficiency, high transmission quality, or a good compromise between them, and received more and more attention. When the number of transmitting and receiving antennas is given, the equivalent spatial degree of freedom of the system, that is, spatial multiplexing or spatial diversity, depends on the degree of transmit correlation\receive correlation. Especially the base station antenna, because it is installed on a very high tower, there are few scattered objects around, so there is more or less correlation, which affects the performance of the system. As a special mul...
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IPC IPC(8): H04L1/06H04L25/03
Inventor 陈晓明张朝阳
Owner ZHEJIANG UNIV