The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
Dec. 26, 2000
Shou Yee Mui, Cherry Hill, NJ (US);
Other;
Abstract
The intersymbol interference compensation (ISIC) method of the invention comprises an encoding step performed by an encoder and a data estimating step performed a data estimator. The encoder performs at least a trellis encoding of a data sequence using a trellis forward-error-correction (FEC) code to provide an encoded sequence, which is supplied to a channel. The data estimator, which advantageously processes a channel output sequence to arrive at an estimate of the data sequence, comprises at least a template generator for generating templates, a partial equalizer for processing the channel output sequence to provide a partially equalized sequence that is substantially free of precursor ISI, and an ISIC decoder for trellis decoding and ISI compensation. The ISIC decoder computes the branch metric for each current branch based on a single-sided template {circumflex over (q)}(x,y) that accounts for the postcursor ISI in the partially equalized sequence, where x is the vector of symbols associated with the past branch or branches that are connected to the current branch and y is the vector of symbols associated with the current branch. The number of states in the ISIC decoder is determined by the trellis code and is independent of the ISI span of the channel. The invention also provides for techniques for adapting the partial equalizer using the templates, estimating the ISI profile, and updating the templates. In one embodiment of the invention, concatenated coding is employed. In yet another embodiment of the invention, the data estimator employs a decision-directed-ISIC (DD-ISIC) decoder that computes the branch metric for each current branch based on a double-sided template ŝ(x,y,z), where z is the vector of symbols associated with the future branch or branches connected to the current branch and is determined by an interim estimate of the data sequence. A double-sided partial equalizer that removes only some of the precursor and postcursor ISI provides the input to the DD-ISIC decoder, which compensates for the unequalized ISI and performs trellis decoding simultaneously.
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