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Space frequency signal processing method

A signal processing and space-frequency technology, applied in multi-frequency code systems, baseband system components, etc., can solve the problems of system performance fading changes, high computational complexity, and performance impact, and achieves reduced computational complexity and high performance. Computational complexity, the effect of addressing performance loss

Active Publication Date: 2007-08-15
LENOVO (BEIJING) CO LTD
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Problems solved by technology

[0015] In addition, the system performance of the above-mentioned second method is very susceptible to the influence of channel frequency selective fading changes, because different sub-carrier signals experience different channel fading, and the second method does not take this problem into account. Instead, the same beamforming weight vector is used for each group of subcarriers, which will inevitably lead to a loss of system performance
[0016] Through the analysis of the above two methods, it can be seen that if the existing shaping technology has optimized performance, the corresponding computational complexity is very high, and if the computational complexity is reduced, it needs to be at the cost of affecting performance
And the system performance of the second method will also be affected by channel frequency selective fading changes

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Embodiment Construction

[0040] The scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The scheme of the present invention is shown in FIG. 2 , and the receiving principle corresponding to the scheme of the present invention is shown in FIG. 3 . The present invention scheme comprises the following steps:

[0042] Step 201. Perform pre-processing on the received array signal, and then transform it into the frequency domain through FFT to form a two-dimensional received signal including the space dimension and the frequency domain dimension.

[0043] As can be seen from Fig. 3, the scheme of the present invention is aimed at N r Each receiving antenna element needs to be transformed by FFT to form a two-dimensional received signal.

[0044] After the two-dimensional received signal is obtained, it is used as an input signal for secondary processing, and the specific processing is as described in ste...

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Abstract

The disclosed space-frequency signal processing method comprises: a. pro-processing the received array signal, transforming signal into frequency domain for 2D receiving signal by FFT; b. shaping large-group sub-carrier wave beam to obtain one-dimensional frequency-domain output signal; c. estimating and balancing channel; and d. recovering signal from step c to emission state. This invention overcomes defects in prior art, reduces calculation complexity, and ensures system performance free to wireless channel variation.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically relates to a method for processing space-frequency signals. Background technique [0002] At present, broadband wireless communication systems usually have a large delay spread, and the transmitted signal will suffer from frequency selective fading. Orthogonal Frequency Division Multiplexing (OFDM) is a very potential multi-carrier modulation technology for signal transmission in such harsh communication environments. Since the OFDM system introduces a guard time interval, that is, a cyclic prefix (CP), it is not sensitive to delayed multipath signals within the guard interval. As long as the length of the cyclic prefix is ​​greater than the impulse response of the channel, it can effectively deal with frequency selection. Intersymbol Interference (ISI) caused by sexual fading. Several current high-speed wireless communication standards have chosen O...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor 刘云辉张孝林
Owner LENOVO (BEIJING) CO LTD
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