Multi-input multi-output system and method of TD-SCDMA system outdoor macro honeycomb

Abstract

The invention relates to an outdoor macro cell multi-input multi-output system for time-division synchronous code-division multi-access system, which comprises a user terminal and a base station. The user terminal is provided with two antennae which are independently weakened, and all array elements of the base station split in two antenna subarrays. The two antenna subarrays wirelessly communicate with two antennae of the user terminal in the mode of multi-input multi-output of the adaptive mixing space diversity and multiplexing. The invention also discloses a multi-input multi-output method applied to the system. The method is adaptively mixed with the multi-input multi-output space diversity mode and space multiplexing mode, and includes the evaluation and judgment as well as adaptiveswitching of two modes, thus converging the advantages of the existing two modes and avoiding the defects when the two modes are separately applied to the TD-SCDMA system, so as to significantly improve the traffic carrying 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 an outdoor macro cell 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 base stat...

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Problems solved by technology

[0012] 2. The disadvantage of applying MIMO spatial diversity in TD-SCDMA outdoor macro cells is that the capacity is not as good as that of MIMO spatial multiplexing in scenarios where the interference of some adjacent cells is not serious and the channel independence is good.

[0015] a) The expansion of the degree of freedom brought by adding an independent antenna on the UE side is completely used to restore the multi-channel independent airspace transmission data. Poor interference capability, which will lead to a decrease in user C / I at the edge of the cell, which in turn will lead to a decrease in downlink capacity;

[0016] b) In a strong LOS environment (the angular extension is very small and there is no attenuation), the degree of freedom of data detection on the downlink UE side will be limited, causing the Node B to turn off the transmission of a certain sub-array, which is a big problem for the system capacity Loss

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