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An exercise method of time-domain equalizer

A technology of time-domain equalizer and training method, which is applied in the direction of gearbox control/balance, multi-carrier system, line transmission components, etc., can solve problems such as real-time implementation, long calculation time, instability, etc., and avoid intermediate collapse , The effect of the stability of the training process

Inactive Publication Date: 2009-11-18
SANECHIPS TECH CO LTD
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  • Description
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a training method for a time-domain equalizer to solve the problems in the prior art that the calculation time is long, cannot be realized in real time, and is unstable

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  • An exercise method of time-domain equalizer
  • An exercise method of time-domain equalizer
  • An exercise method of time-domain equalizer

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Embodiment Construction

[0020] In the following, the specific implementation of the present invention will be further described in detail by taking the time-domain equalizer of the receiver in the ADSL system as an example in conjunction with the accompanying drawings.

[0021] figure 1 The equalizer model of ADSL receiver is introduced, in which the channel in solid line is the actual channel, which is composed of physical channel H cascaded with time-domain equalizer W. Before training, bypass the time-domain equalizer W, and then turn on the equalizer W after proper training to realize the equalization function; the dotted line channel is the equivalent target channel, and the tap coefficient of the equalizer W is configured so that the physical channel H The overall effect of and equalizer W is equivalent to the dashed channel. After the signal X passes through the physical channel H and the additive interference of the additive channel noise N, it is received as a signal Y at the receiver. In o...

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Abstract

The invention provides a training method of a time-domain equalizer, which can be applied to a time-domain equalizer of a receiver in wired data communication, comprising the following steps: estimating the channel through a pseudo-random sequence; quantizing the estimated channel impulse response into Q bit integer; calculate auxiliary matrix A and B; decompose matrix A into two triangular matrices; calculate matrix C=A-1B; calculate the eigenvector corresponding to the maximum eigenvalue of matrix C; quantify the eigenvector according to system requirements, Get the tap coefficients of the time domain equalizer. The method of the invention can be applied to different systems by setting different channel lengths, tap numbers of time domain equalizers and cyclic prefix lengths; it can also be applied to receivers at the central office and user end through proper configuration. By adopting the method of the invention, the time-domain equalizer can be trained in a short time, achieving the effect of real-time realization, and the training process is stable, avoiding the middle collapse.

Description

technical field [0001] The invention relates to the field of wired data communication, in particular to a training method for a time domain equalizer of a receiver in an asymmetrical digital subscriber line (ADSL) system and an orthogonal frequency division multiplexing (OFDM) communication system. Background technique [0002] The current ADSL system standards are ANSI T1.413 and ITU G.992.1, etc. These standards are all based on the discrete multi-tone (DMT) modulation protocol, that is, each frame is composed of a series of sampled inverse Fourier transforms (IFFT). The number of samples used in each frame is related to the sampling rate supported by the system and the channel bandwidth that can be used. For example, the supported bandwidth of the downlink channel is 1.104MHz, so the sampling rate of the receiver at the ATU-R (ADSL transceiver user end) Usually 2.208MHz; and the bandwidth supported by the uplink channel is 138kHz, so the receiver sampling rate at the ATU-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B3/04H04J11/00H04L27/32
Inventor 张学林
Owner SANECHIPS TECH CO LTD
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