Method, apparatus and base station for processing precoding of multi-input multi-output broadcast channel

Abstract

The invention discloses a precoding treatment method for a multi-input multi-output (MIMO) broadcast channel, and a precoding treatment device and a base station thereof. The method comprises the following steps: utilizing a unit matrix as a decoding matrix of a receiver o obtain a receiver initial decoding matrix; calculating an initial precoding emission matrix corresponding to each user data stream according to the receiver initial decoding matrix and the minimum mean square error standard; utilizing the multiplication of an emission channel matrix and the initial precoding emission matrix as an equivalent channel corresponding to the user, and performing the singular-value decomposition of the equivalent channel corresponding to the user and then selecting a right eigenvector with the maximum eigenvalue from the decomposition results; utilizing the multiplication of the initial precoding emission matrix and the conjugate transpose of the right eigenvector as a first precoding emission matrix; performing the iterative calculation of the final precoding emission matrix and the decoding matrix of the receiver by utilizing the first precoding emission matrix until the preset condition comes into existence. The precoding treatment method increases the convergence rate of calculating the precoding emission matrix and the receiver decoding matrix.

Description

technical field [0001] The invention relates to a precoding technology in a multi-user MIMO system, in particular to a precoding processing method and device in a multi-user MIMO broadcast channel. Background technique [0002] Future wireless communication systems are required to provide higher and higher information transmission rates and communication quality. In order to achieve this goal on limited spectrum resources, MIMO (Multi Input Multi Output, Multiple Input Multiple Output) technology has become one of the indispensable means adopted in future wireless communications. [0003] In the MIMO system, the transmitting end uses multiple antennas to transmit signals, and the receiving end uses multiple antennas to receive signals. Studies have shown that compared with traditional single-antenna transmission methods, MIMO technology can significantly increase channel capacity, thereby increasing information transmission rates. [0004] Using a pre-coding (pre-coding) t...

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Problems solved by technology

[0036] However, both of the above two methods have the problem that the convergence speed is too slow, and the reason for the above-mentioned slow convergence speed is that the initial receiving matrix in the existing algorithm is R k 0 = [ I L k , 0 ] , in is L k × L k Unit matrix, 0 is L k ×(N k -L k ) zero matrix

If you use this To combine the received signals, it is equivalent to only using L k The information on the receiving antennas, while the other N k -L k The information on the first receiving antenna is wasted, and it is not optimal to use this as the initial receiving matrix, resulting in slower convergence

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