MIMO system precoding method

A technology of precoding and precoding matrix, which is applied in the precoding field of MIMO systems, can solve problems such as large hardware overhead, high computational complexity, and limited FPGA resources, and achieve the goal of reducing overhead, reducing the number of iterations, and improving precoding performance Effect

Active Publication Date: 2016-06-22
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, FPGA resources are limited, and the existing methods have high computational complexity and require a lot of hardware overhead.

Method used

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Embodiment

[0033] Such as figure 1 As shown, according to a preferred embodiment of the present invention, a precoding matrix solution method based on quasi-diagonal matrix and block SVD decomposition suitable for hardware implementation, the method can be applied to the MIMO wireless system under the IEEE802.11ac protocol precoding module. It mainly includes the following steps:

[0034] Step 1: Channel detection, explicitly feedback channel state information (hereinafter referred to as CSI), and obtain the channel matrix H; the specific steps are:

[0035] Step 11: The transmitter transmits an NDP frame through 4 antennas, where the structure of the NDP frame is as follows figure 2 As shown, the non-detection bit of the VHT-SIGA field is set to 0, and the signal frequency sent by the antenna is 20MHz.

[0036] Step 12: The receiver performs channel estimation after synchronizing the received signal to obtain and feed back the fourth-order complex channel matrix H; the specific step...

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Abstract

The invention discloses an MIMO system precoding method which comprises the following steps: in a first step, an information channel is detected, state information of the information channel is displayed and fed back, and an information channel matrix H is obtained; in a second step, the information channel matrix H is partitioned, and a quasi diagonal matrix X and a partitioned elementary column transformation matrix Q are obtained; in a third step, the quasi diagonal matrix X is subjected to block-based singular value decomposition operation, and a unitary matrix V is obtained; in a step 4, a precoding matrix W is obtained according to the matrix Q and the matrix V, and therefore precoding operation can be conducted. The precoding matrix is obtained mainly by adopting a method of combining an operation of matrix partitioning and an operation of subjected the quasi diagonal matrix to SVD. According to the MIMO system precoding method, while precoding performance is not affected in an evident way, tremendous higher-order complex matrix operations can be prevented, the number of iterations needed for direct matrix decomposition can be greatly reduced, and therefore costs of hardware resource can be lowered.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a precoding method of a MIMO system. Background technique [0002] Multiple-input multiple-output (hereinafter referred to as MIMO) technology is a mainstream technology of a new generation of wireless communication, and is applied in many ultra-high-speed wireless local area network (WLAN) standards, such as the IEEE802.11ac protocol. MIMO-based precoding technology can eliminate the interference between transmitted data streams, increase the capacity of MIMO channels, thereby improving the throughput rate and data reliability of the entire system, so it has become one of the key technologies in ultra-high-speed wireless LANs. [0003] Among the common precoding algorithms for hardware implementation, the method based on zero-forcing (hereinafter referred to as ZF) is the simplest. However, the system is very sensitive to noise when the signal-to-noise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0413H04B7/0417H04B7/0456H04B7/0626
Inventor 俞菲张皓月张晓燕黄永明杨绿溪
Owner SOUTHEAST UNIV
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