A Simplified Multi-User MIMO Pairing Method
A multi-input, multi-output technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of low precision and low computational complexity of spatial correlation coefficients between users, and reduce low precision and complexity Effect
Inactive Publication Date: 2016-12-28
XIAN UNIV OF SCI & TECH
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[0008] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a simplified multi-user multiple-input multiple-output that reduces the problem of low precision of the usual PMI feedback mode, and at the same time the complexity of calculating the spatial correlation coefficient between users is low pairing method
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Embodiment 1
[0020] figure 1 It is a schematic diagram of the 8-unit dual-polarized array antenna used in the present invention. Specifically, the TDD-LTE base station side has 8-unit dual-polarized antennas, and the UE side supports SRS two-antenna alternate transmission. figure 2 The steps for the pairing method are as follows:
[0021] 1. Establish a space characteristic vector table with an element dimension of 1×8. Each space vector in the table corresponds to a number i, among them Calculate the correlation coefficient of any space vector numbered p and q in the space vector table, the calculation formula is Obtain the correlation coefficient matrix between the space vectors.
[0022] 2. Obtained channel estimation results from the kth transmitting antenna of the nth user uplink to all 8 receiving antennas of the base station Perform matching operation with the spatial characteristic vector table in step 1, the calculation formula is as follows:
[0023] G _ h i nk = ...
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The invention discloses a simplified multi-user multiple-input multiple-output pairing method, which comprises the following steps of: establishing a spatial characteristic vector table on a base station side, and pairwise calculating the correlation coefficients of space vectors in the spatial vector table to obtain a correlation coefficient matrix; obtaining the optimal matching space vector of uplink channel estimation; extracting the spatial characteristic vector of a user channel matrix; looking up the spatial correlation coefficient matrix by a dispatcher, looking up a user of which the spatial characteristic is orthogonal for pairing, applying a pairing result to downlink MU-MIMO (multi-user multiple-input multiple-output) emission; and looking up an inter-user spatial correlation coefficient matrix by the dispatcher, looking up a user of which the spatial characteristic is orthogonal for pairing, and applying a pairing result to uplink MU-MIMO emission. According to the simplified multi-user multiple-input multiple-output pairing method disclosed by the invention, the problem of low precision of the traditional PMI (program management instruction) feedback mode can be reduced, and meanwhile, the calculation complexity of the inter-user spatial correlation coefficient can be reduced in a table look-up mode.
Description
Technical field [0001] The present invention relates to multiple-input multiple-output transmission technology in LTE and LTE-A wireless communication systems, and in particular to a simplified multiple-input multiple-output pairing method for multiple users. Background technique [0002] In the LTE system, the introduction of single-user MIMO has improved the system's spectrum efficiency. The 3GPP LTE R10 protocol has formulated a single-user MIMO mode with a maximum of 8 ports in the downlink and 4 ports in the uplink. Since the gain of MIMO is closely related to the number of input and output antennas, it is relatively easy to implement multi-antenna reception and transmission on the base station side, while it is difficult to support multi-antenna reception and transmission on the terminal side. [0003] Uplink and downlink multi-user MIMO can solve the problem that the number of terminal antennas is small and cannot support multiple ports. Multi-user MIMO allocates multiple u...
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IPC IPC(8): H04B7/04
Inventor 曾召华
Owner XIAN UNIV OF SCI & TECH