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This paper studies the channel reciprocity calibration problem based on minimum mean square error (MMSE) in a 7-Cell network multiple-input and multiple-output (MIMO) system. Network MIMO system can mitigate the inter-cell interference by joint precoding techniques. However, mismatches between the transceiver modules of the antennas destroy the channel reciprocity in time division duplex (TDD) mode...
A large scale MIMO (multiple-input multiple-output) system with cloud base-station (BS) architecture is proposed to address the lack of spectrum resource. Potential transmission schemes including uplink training and downlink precoding are described and analyzed in this paper. The novel system is designed to mitigate interferences among users and make full use of spatial multiplexing gain. Simulation...
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