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Method for applying MIMO technique in TD-SCDMA system outdoor macrocell

A TD-SCDMA, macrocell technology, applied in transmission systems, diversity/multi-antenna systems, space transmit diversity and other directions, it can solve the problems of downlink capacity reduction, user C/I reduction, limited degrees of freedom, etc., and achieve capacity improvement. , the effect of improving throughput

Active Publication Date: 2009-02-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 neighboring cells is not serious and the channel independence is good.
The disadvantage of applying MIMO spatial multiplexing to TD-SCDMA outdoor macro cells is that the degree of freedom expansion brought about by adding an independent antenna on the UE side is completely used to restore multiple channels of independent airspace transmission data, and the downlink multi-cell joint detection can suppress neighbors. The proportion of cell interference is the same as that of the existing single-antenna solution, so the anti-interference ability is poor, which will lead to a decrease in the user C / I at the edge of the cell, which in turn will lead to a decrease in downlink capacity; in a strong LOS environment (the angle spread is very small and There is no fading), the data detection on the downlink UE side will have a limited degree of freedom, resulting in the Node B having to turn off the transmission of a certain sub-array, which is a great loss to the system capacity
[0010] Therefore, if the TD-SCDMA outdoor macro cell can simultaneously apply the MIMO space diversity method and the multiplexing method, so as to combine the advantages of the above two methods and avoid the disadvantages of the two methods alone, it is undoubtedly ideal. However, it has not yet been realized. technologies related to this

Method used

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  • Method for applying MIMO technique in TD-SCDMA system outdoor macrocell
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  • Method for applying MIMO technique in TD-SCDMA system outdoor macrocell

Examples

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example 1

[0051] Example 1: Processing on the Node B side

[0052] Such as image 3 As shown, on the Node B side, the Node B first performs space-time channel estimation on the uplink control channel, and then calculates the channel spatial correlation matrix and obtains the two largest eigenvalues ​​and corresponding eigenvectors; The normalized carrier-to-interference ratio of the channel corresponding to the transport block is obtained; finally, traverse the power allocation ratio of the main / auxiliary transport block to predict the throughput of the single-stream mode and the maximum throughput of the dual-stream mode, thereby determining the single / dual-stream mode and the main / secondary mode. Auxiliary transmission block size, modulation mode, transmit power ratio.

[0053] Specifically, it can be described as the following processes (1) to (8).

[0054] (1) Node B obtains the channel impulse response of different transmit antennas on the UE side by performing channel estimation...

example 2

[0072] Example 2: Processing on UE side

[0073] For the dual-stream mode of the downlink high-speed packet service, the joint detection system equation of the UE receiver is extended as follows (processing (1) to processing (4))

[0074] (1) Through channel estimation, the UE obtains the channel impulse response h of the primary / secondary transmission block on the two receiving antennas p (1) 、h s (1) 、h p (2) 、h p (2) ; Then convolve the same group of scrambled spread spectrum composite codes separately to get the corresponding b vector b p (1) , b s (1) , b p (2) , b p (2) ; and according to the existing method, the b vector is horizontally arranged to obtain a small block v p (1) , v s (1) , v p (2) , v p (2) ;

[0075] (2) Arrange the V blocks corresponding to the main / auxiliary transmission blocks of the same antenna horizontally to obtain a new V block V ( 1 ) ...

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Abstract

The invention provides a method which applies multiple input multiple output technology in an outdoor macrocell of a TD-SCDMA system, wherein, the user equipment side is provided with at least two independent antennas and at least two independent antennas have the same launching power; the node B side is provided with array antennas; wherein, downlink supports single-stream mode launch under beam-forming mode and double-stream mode launch under pre-encoding mode, and the node B can carry out switch of the single-stream mode and the double-stream mode to user equipment.

Description

technical field [0001] The present invention relates to Time Division Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) system, in particular to the application of multiple input multiple output (Multiple Input Multiple Output, MIMO ) technical solutions. Background technique [0002] Multiple-input multiple-output (MIMO) technology is a hot research field in the field of mobile communication in recent years, and it is characterized in that both wireless transmitters and receivers introduce multiple antennas. Compared with the traditional single input single output (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...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08H04B1/707H04L1/06
Inventor 耿鹏江海肖炼斌张银成
Owner ZTE CORP
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