Precoding recursive method for adding and subtracting antennas in massive mimo
A precoding, large-scale technology, applied in the field of precoding recursion of massive MIMO antenna addition and subtraction, can solve the problems of large hardware implementation difficulty, large base station and user end, exceeding the channel coherence time, etc.
Active Publication Date: 2021-03-09
SOUTHEAST UNIV
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Problems solved by technology
However, hundreds of antennas need to be configured in the base station, and the application in the actual environment still faces many huge problems
For ZF and MMSE precoding, due to the large number of base stations and user terminals, if it is not handled properly, it will cause a huge delay, even exceeding the coherence time of the channel
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[0064] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0065] 1) ZF precoding recursive algorithm for decreasing antenna selection
[0066] Scenario description:
[0067] Suppose the base station in the MIMO system has N t Antennas, the receiving end has N r root antenna, select at the transmitter L t root antenna. In the decreasing-based sliding window antenna selection, the initial state channel is Decrease antennas one at a time until the desired number of antennas is reached. The ZF precoding recursive algorithm based on the decreasing sliding window scenario aims to take advantage of the N t The original precoding matrix when there are only one antenna, deduce that after reducing one antenna, N t -The pr...
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The invention provides a pre-coding recursion method of a large-scale MIMO increase / decrease antenna, which comprises a recursion method of ZF pre-coding and MMSE pre-coding when the antenna is selected in a decreasing mode and a recursion method of the ZF pre-coding and the MMSE pre-coding when the antenna is selected in an increasing mode under the situation of sliding windows. According to themethod, the intermediate result of a preceding state pre-coding matrix is utilized in the pre-coding matrix, so that matrix inversion is completely avoided; only a simple matrix addition and multiplication method are involved, and a comprehensive recursion method is synthesized, so that the calculation complexity of the algorithm is greatly reduced. In addition, in actual hardware equipment implementation, the multiplication operation is easier to implement compared with the division method and the inverse operation; therefore, the hardware efficiency is greatly improved. According to the method, when the SNR is low and the number of antennas before and after selection is small, the performance similar to that of the original MMSE pre-coding technology can be achieved.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a precoding recursive method for increasing and decreasing antennas of massive MIMO. Background technique [0002] Massive MIMO technology can significantly improve the performance of wireless communication systems. By configuring multiple antennas at the base station or mobile terminal, the system can obtain additional diversity gain and multiplexing gain. Studies have shown that the capacity of the system increases with n=min(n T ,n R ) grows linearly, n T , n R represent the number of antennas at the transmitter and receiver, respectively. With the development of massive MIMO technology, hundreds of antennas will be deployed on base stations and mobile terminals, which can theoretically be infinite. In an actual wireless communication system, due to factors such as the size of the antenna and the complexity of system configuration, it is impossible for the an...
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IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 崔梦佳吴炳洋杨锦
Owner SOUTHEAST UNIV