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Systems and methods for frequency domain realization of non-integer fractionally spaced time domain equalization

A fractional interval, time-domain equalizer technology, applied in the field of communications, can solve problems affecting performance, filter coefficient divergence, etc.

Inactive Publication Date: 2013-05-01
IKANOS COMMUNICATIONS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This aliasing can be added constructively or destructively, thus, adversely affecting performance
Although techniques exist for mitigating the effects of aliasing, there are various perceived drawbacks, such as filter coefficient divergence for integer fractional interval TEQ

Method used

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  • Systems and methods for frequency domain realization of non-integer fractionally spaced time domain equalization
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  • Systems and methods for frequency domain realization of non-integer fractionally spaced time domain equalization

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Embodiment Construction

[0017] Having outlined various aspects of the disclosure, descriptions of the disclosure as shown in the figures will now be discussed in detail. While the present disclosure is described in conjunction with these figures, there is no intent to limit the present disclosure to the embodiment or embodiments disclosed herein. On the contrary, the intention is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the present disclosure as defined by the appended claims.

[0018] Discrete Multi-Tone (DMT) modulation is one of the most important modulation methods used in high-speed digital communications. DMT modulation divides the wideband channel into a large number of nearly independent narrowband sub-channels. Ideally, each narrowband subchannel has a flat frequency response and can be modeled as gain plus additive white Gaussian noise (AWGN). The total number of bits sent over the wideband channel is the sum of the bits sent in e...

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Abstract

Various systems and methods are described for performing fractionally spaced time domain equalization (TEQ). One embodiment is a method implemented in a communication system for training a fractionally spaced time domain equalizer (TEQ). The method comprises performing an initialization phase, averaging a received signal in the system to reduce effects of noise in a channel, determining a channel estimate, and aligning an ideal reference signal with the received signal. The method further comprises updating a target response filter according to a non-integer multiple of a base sampling rate, determining an adaptation error based on useful information both inside and outside a Nyquist band of the TEQ, and updating the TEQ according to the adaptation error.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to, and benefit from, U.S. Patent Application Serial No. 13 / 081,962, filed April 7, 2011, and entitled "System for Frequency Domain Implementation of Time Domain Equalization for Non-Integer Fractional Intervals" and Methods (Systems and Methods for Frequency Domain Realization of Non-integer Fractionally SpacedTime Domain Equalization); and U.S. Provisional Patent Application Serial No. 61 / 324,585, filed April 15, 2010, entitled "For Non-integer Fractionally Spaced Time Domain Equalization"; Method and System for Frequency Domain Realization of Non-integer Fractionally SpacedTime Domain Equalizer", the entire contents of these two applications are incorporated by reference. technical field [0003] The present disclosure relates generally to communications, and more particularly to systems and methods for performing combinatorial equalization in communications systems such as, but not li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/01
CPCH04L25/022H04L2025/03681H04L25/03044H04L27/00H04L27/01
Inventor 李林林艾米库玛·玛哈戴文
Owner IKANOS COMMUNICATIONS
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