Linear equilibrium method and linear equalizer

A linear equalization and equalizer technology, applied in the field of communication, can solve the problems of high equalizer complexity, slow convergence speed, and increased search space dimension, achieving fast and stable convergence and reducing complexity

Inactive Publication Date: 2009-07-29
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0007] During the research and practice of the prior art, the inventor found that the prior art has at least the following problems: the computational complexity of each update of the RLS equalizer is O([N(N f +1)] 2 ), when the number of receiving antennas is large, the complexity of the equalizer is too high; the convergence speed of the RLS equalization algorithm is determined by the dimension of the search space of the algorithm. With the increase of the number of receiving and transmitting antennas, the dimension of the search space increases and the convergence slow down

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  • Linear equilibrium method and linear equalizer

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Embodiment Construction

[0025] The embodiment of the present invention provides a linear equalization method and a linear equalizer. When used to eliminate inter-symbol interference, a multi-stage Wiener filter (MSWF, Multi-Stage Wiener Filter) is used to turn the received high-dimensional signal into a low-dimensional signal. The rank of the covariance matrix of the received signal vector is also reduced accordingly, so the dimensionality reduction filtering algorithm is usually also called the rank reduction filtering algorithm. The multi-stage Wiener filter is a set of basis vectors of the reduced dimensionality subspace obtained through a series of update processes. It does not need to estimate the covariance and does not involve the inversion of any order matrix. It has the characteristics of low computational complexity and multi-level dimensionality. The nano filter can obtain an approximate full-rank minimum mean square error (MMSE, Minimum Mean Square Error) when the rank of the filter is much s...

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Abstract

The invention discloses a linear equalizing method and a linear equalizer. The linear equalizing method comprises the following steps: an M-dimensional signal vector is received, and M is a positive integer; dimension reduction of the M-dimensional signal vector is implemented by a multilevel Wiener filter, thus obtaining and outputting a dimension-reduced signal vector; and weighted addition of the dimension-reduced signal vector is implemented, and a result is output. The linear equalizing method and the linear equalizer can convert the received high-dimensional signal vectors into low-dimensional signal vectors, and consequently lower the complexity of equalizing operation and raise the convergence velocity of equalizing operation.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to a linear equalization method and linear equalizer. Background technique [0002] In wireless communication, as the data transmission rate continues to increase, the signal bandwidth is greater than the coherent bandwidth of the channel. At this time, the flat fading channel becomes a frequency-selective fading channel. After the signal passes through the frequency-selective fading channel, the multipath delay component will cause the overlap of adjacent signals in the time domain, called Inter-Symbol Interference (ISI, Inter-Symbol Interference), which will seriously affect the demodulation performance of the receiver. Equalization technology can effectively eliminate ISI and improve the system's anti-inter-code interference performance. [0003] MIMO (Multiple-Input Multiple-Output) system, that is, a system in which multiple antennas are used for signal transmission and receptio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 任品毅文雪李杰
Owner HUAWEI TECH CO LTD
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