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Quick iteration beam forming method

A beamforming and beamforming matrix technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, etc., can solve the problems of not achieving the expected effect and increasing the channel state, and achieve the effect of reducing training overhead and improving training speed.

Inactive Publication Date: 2015-07-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

One of the basic assumptions of antenna training is that the channel state remains unchanged for a reasonable period of time. If the training time lasts too long, the probability of a large change in the channel state will greatly increase, and the expected effect will inevitably not be achieved in practical applications.
In addition, in addition to the first stage of iteration, each subsequent stage of iteration must perform a zero-space projection operation, which introduces additional errors and overhead.

Method used

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Examples

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Embodiment

[0049] For a sparse multipath MIMO system with 50 transmit antennas and 50 receive antennas, the sparse multipath channel can be modeled as a geometric model with K-path multipath: in, Indicates the complex channel gain of the i-th path, θ i ,φ i Denote the angle of departure and angle of arrival of the i-th path, respectively. a T (φ i ) and a R (θ i ) are the antenna array responses of the transmitter and receiver, respectively. Here, we use uniform linear arrays (ULAs), whose antenna array response can be expressed as: Among them, λ is the signal wavelength, and d is the distance between antenna elements, which is generally taken as The receive antenna response is similar. The number of multipaths is set to 5, and the number of iterations is 5.

[0050] A fast iterative beamforming method, the specific steps are as follows:

[0051] S1. Initialization, specifically:

[0052] S11. Randomly generate an N at the sending end T x1 vector r 0 , the vector r 0 T...

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Abstract

The invention belongs to the technical field of wireless communications, and relates to a method for quickly acquiring a plurality of formed beams at the same time in a wireless multiple input multiple outlet (MIMO) communication system by using channel reciprocity of a time division duplex system for iterating, in particular to a quick iteration beam forming method. The quick iteration beam forming method includes the following steps of initializing, conducting LANCZOS iteration, conducting iterative loop control, calculating a transmitting beam forming matrix F and training a receiving beam forming matrix. According to the method, the channel reciprocity of the time division duplex system is adopted, and channel state information does not need to be estimated; meanwhile, through the quick convergence performance and the characteristic that multiple feature vectors can be obtained at the same time of the LANCZOS algorithm, the antenna training speed is greatly increased, and the training cost is lowered.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and in particular relates to a wireless multiple-input multiple-output (Multiple Input Multiple Output, MIMO) communication system that utilizes channel reciprocity of a time-division duplex system to perform iterations to quickly obtain multiple beamforming beams at the same time. Methods. Background technique [0002] In MIMO systems, according to the criterion of maximizing the signal-to-noise ratio at the receiving end, the method to obtain the optimal beamforming matrix is ​​the eigenbeamforming method. When the channel state information (Channel State Information, CSI) is known to both the transmitter and receiver, the optimal transmit and receive beamforming matrices can be obtained by performing Singular Value Decomposition (SVD) on the channel matrix H. The specific principles are as follows: [0003] Assume that the number of receiving antennas in the MIMO syste...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
Inventor 付自刚成先涛
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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