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Code filtering self-adaptive wave beam formation method

An adaptive beam and beam technology, applied in code division multiplexing system, radio/induction link selection arrangement, space transmit diversity and other directions, can solve the problem of not using WCDMA protocol pilot bits, complexity and computational complexity , difficult hardware implementation and other problems, to achieve the effect of shortening the research and development cycle, simplifying the system structure and easy hardware implementation

Inactive Publication Date: 2008-03-05
ZTE CORP
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Problems solved by technology

At present, various adaptive beamforming methods have been proposed, such as the constant modulus method, but this method is a completely blind method, which does not use the pilot bits specified in the WCDMA protocol, which is a waste of resources; there are also some beamforming methods Methods, such as Wiener solution and cascade training method, all involve large-scale matrix multiplication and inversion operations in the implementation process, the complexity and amount of calculation are too large, and it is not easy to implement in hardware

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  • Code filtering self-adaptive wave beam formation method

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Embodiment Construction

[0031] The core idea of ​​the beamforming method of the present invention is to firstly perform a time delay search in the beam domain, obtain time delay information more accurately, obtain the autocorrelation matrix before and after despreading of the array baseband signal with time delay alignment, and calculate the maximum of their difference matrix The generalized eigenvectors corresponding to the generalized eigenvalues ​​are used as adaptive weights, and beamforming is performed using the weights.

[0032] According to the above ideas, the specific steps of the beamforming method of the present invention are described as follows,

[0033] Time delay search with pre-multibeam:

[0034] First, assuming that the signal received by the array is denoted as X, multiple fixed narrow beams are generated by using the fast Fourier transform, the beamforming receives the data array, and the signal delay of multiple beams is searched to obtain the delay value of each path, here We ...

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Abstract

This invention discloses a formation method for a code filter adaptive beam utilizing reserved multibeam for time delay search to process in auto correlation operation of the array data, then the two matrixes are minus to get a generalized character vector corresponded to the maximum character value of the difference matrix as the weight value of the said time slot on form the weight value beam to deexpand data to combine multiroute and deexpand data to reduce the operation greatly and output the maximum s / n ratio.

Description

technical field [0001] The invention relates to a wideband code division multiple access communication system, more specifically to a code filter adaptive beamforming method for a smart antenna base station of the wideband code division multiple access communication system. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) is the third generation of communication technology. Compared with the second generation, it has better security, higher transmission rate and other performances, and has become the trend of communication system development. And smart antenna technology is the key technology of WCDMA system, it helps to fight against interference, increase system capacity and increase cell coverage area. The core technology in the smart antenna technology is the adaptive beamforming technology, and the improvement degree of the smart antenna to the communication system mainly depends on the performance of the adaptive beamforming method. At pres...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/00H04Q7/20H01Q3/26H04B7/06
Inventor 迟立东孙公航
Owner ZTE CORP