Indoor-overlapping multi-input multi-output system and method of TD-SCDMA system

Abstract

A multi-input multi-output system indoor covered in a time diversion synchronous code division multiple access system comprises a user terminal and a base station; the user terminal is provided with an independent weak double-antenna; the system is collocated to be that two channels are mixed to cover a certain area together to an indoor covering environment; the channels keep independent with each other; the system adopts a multi-input multi-output mode of 2 multiplied by 2; the invention also discloses a multi-input multi-output method applied in the system; the base station evaluates the situation of a user business throughput under the space diversity and the space multiplexing modes and self-adaptively respectively switches an upstream link and a downstream link into a mode with a higher throughput speed evaluation value; thereby integrating the advantages of the existing two multi-input multi-output modes and simultaneously avoiding the defects of the two multi-input multi-output modes when the two multi-input multi-output modes are independently used in a TD-SCDMA system, thus remarkably improving the business capacity.

Description

technical field [0001] The invention relates to a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, in particular to a system and method for applying multiple input multiple output (MIMO) technology in indoor coverage of the TD-SCDMA system using smart antennas. Background technique [0002] MIMO technology is a hot research field in the field of mobile communication in recent years, and it is characterized in that both the wireless transmitter and the receiver introduce multiple antennas. Compared with the traditional single-input single-output (SISO) system, the MIMO system obtains a great increase in system capacity through space diversity technology or space multiplexing technology. Multiple-input single-output (MISO) and single-input multiple-output (SIMO) are two special forms of MIMO, that is, multiple antennas are only used at one end of the communication link, and a single antenna is still used at the other end. [0003] The mainstream solu...

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Problems solved by technology

[0010] 2. The disadvantage of using MIMO spatial diversity in TD-SCDMA indoor coverage is that the capacity is not as good as that of MIMO spatial multiplexing in some scenarios where channel independence is good and interference is not serious (high signal-to-noise ratio).

[0012] 4. The disadvantage of using MIMO spatial multiplexing in TD-SCDMA indoor coverage is that in a strong LOS environment, the degree of freedom of data detection on the downlink UE side will be limited, resulting in Node B having to close the transmission of a certain channel. It is a big loss for system capacity

[0015] 2. In the indoor environment, due to the large number of reflections and scattering and the large angle expansion, the probability that the LOS path is absolutely dominant is smaller.

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