Precoding method and matrix generating device for cooperative multipoint multiuser mimo system

Abstract

A precoding method and matrix generation device for a coordinated multiple point (CoMP) multiple user MIMO (MU-MIMO) system, the method comprising the following steps: S1, a central control station acquires from each cell base station n (n=1,...,T) a base station transmission power Pn (n=1,...,T), the channel information Hn,i between the base station n and a user i, and a signal-to-noise ratio SNRn,i (i=1,...K), wherein T is the number of cooperative cells, and K is the number of users in the system, and further obtains the channel information Hi and the noise power sigmai 2 of each user; S2, acquiring the complementary channel H̅ i of each user on the basis of the channel information Hi of each user, and conducting channel expansion for each complementary channel H̅ i to obtain a matrix H̿={ H̅ i,sigmai / }, wherein / is the unit matrix of formula I, and Mk represents the number of the receiving aerial of the user k; S3, conducting LQ decomposition for the matrix H̅ i to obtain a unitary matrix Qi; S4, conducting conjugate transposition for the submatrix Q̅ i of the unitary matrix Qi, and multiplying the transposed submatrix by Hi to obtain the equivalent channel Hi equ of each user; S5, conducting SVD decomposition for the equivalent channel Hi equ to obtain the precoding matrix Wi (i=1,...,K) of each user; and S6, obtaining the precoding matrix Wn base (n=1,...T) of each base station according to the precoding matrix Wi (i=1,...,K) of each user, and transmitting the precoding matrix Wn base (n=1,...T) to the corresponding cell base station for precoding.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a precoding method and a matrix generating method of a cooperative multipoint user MIMO system. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology is a major breakthrough in the field of wireless mobile communication. MIMO technology refers to the use of multiple antennas for data transmission and reception. Studies have shown that using MIMO technology can increase the capacity of wireless communication systems. With the deepening of multi-antenna technology research, MIMO technology has been extended from point-to-point single-user MIMO technology to point-to-multipoint multi-user MIMO system (Multiple User MIMO, MU-MIMO). In MU-MIMO technology, the multi-antenna diversity gain can effectively reduce the system bit error rate, and the multi-antenna multiplexing gain can expand the capacity area of ​​the multi-user system. MU-...

AI Technical Summary

Problems solved by technology

However, BD technology must be satisfied that the number of antennas at the sending end is greater than or equal to the sum of the number of receiving antennas of all users, so BD technology is not suitable for the situation where each user at the receiving end has any receiving antenna

Moreover, BD technology only eliminates the interference between users, and does not consider the impact of noise on system performance, so when the signal-to-noise ratio decreases, its performance is relatively poor

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