Matrix equalizer for cmfb transmission in dispersive channels

一种均衡器、矩阵的技术，应用在矩阵均衡器的确定领域，能够解决缓慢收敛、干扰传输信道等问题，达到少开销的效果

Active Publication Date: 2018-11-23
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only meets the needs of transmission channels with short impulse responses and negligible inter-symbol interference (ISI)
Likewise, in contrast to the case of OFDM, frequency-domain channel estimation in CMFB is affected by the inherent inter-channel interference ICI, and thus converges only slowly

Method used

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  • Matrix equalizer for cmfb transmission in dispersive channels
  • Matrix equalizer for cmfb transmission in dispersive channels
  • Matrix equalizer for cmfb transmission in dispersive channels

Examples

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Embodiment Construction

[0042] figure 1 A CMFB receiver with a matrix equalizer according to the invention is shown, wherein the matrix equalizer is structured as equation (1) as explained previously and is arranged between positions "y" and "s". In order to realize the equalizer, the inventor now explains the steps in more detail.

[0043] First, the channel impulse response CIR c(t) will be estimated in the time domain by using the training signal. In Section B later, the standard least squares method is described in detail. The training signal should be as wideband as possible and is typically generated using pseudo-random data modulation of active subcarriers.

[0044] Now, the matrix channel impulse response C(i) can be determined. The impulse response matrix C(i) describes the influence of the channel c(t) on each of the M subchannels, i.e., the inter-symbol interference ISI and the inter-channel interference ICI due to the distortion by c(t) (see denotation (2)). L in C(i) C m 2 The num...

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Abstract

The present invention is concerned with Cosine Modulated Filter Band modulation, in particular for a matrix equalizer for equalising a modulated signal carrying digital data, wherein the signal is modulated using a CMF6 and transmitted through a transmission channel having a channel impulse response c(t), wherein the matrix equalizer comprises: matrix coefficients W(i) determined based on the discrete-time matrix channel impulse response C(i) that is determined from the channel impulse response c(t); wherein the matrix equalizer is configured to equalize the modulated signal in order to reducesignal distortion introduced by the transmission channel. The present invention also concerns a method for equalising the CMFB modulated signal.

Description

technical field [0001] The present invention discloses a method for receiving a signal carrying digital data using a matrix equalizer in order to reduce signal distortion introduced by a transmission channel. The invention also relates to the determination of the matrix equalizer. Background technique [0002] Cosine-modulated filter bank CMFB modulation for digital data transmission provides high spectral capacity, low overhead, and high flexibility in spectrum usage. However, it is sensitive to signal distortions introduced by the transmission channel. [0003] CMFB modulation is an improved version of Orthogonal Frequency Division Multiplexing OFDM modulation. Both modulation types support flexible spectrum usage. The advantages of CMFB over OFDM are: (i) a better accommodated transmit spectrum, obtained by additional filtering, and (ii) higher efficiency, since the cyclic prefix overhead of OFDM can be omitted. However, CMFB implementation has higher computational co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/0212H04L25/0228H04L25/03159
Inventor D.楚恩
Owner HITACHI ENERGY LTD
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