Title of Invention

METHOD AND APPARATUS FOR GENERATING SOFT VALUES FROM A SET OF COMPLEX VALUES

Abstract

A method of operating a receiver apparatus to generate soft values from a set of complex values communicated to said receiver apparatus, the method comprising operating said apparatus to perform the steps of a) receiving a first set of complex values, said first set of complex values being received complex symbol values obtained from signals communicated over a channel; b) receiving a set of soft bits, said soft bits corresponding to said complex symbol values; c) performing a complex multiplication operation on each of at least some; of said first set of complex values to generate at least some elements of a second set of complex values, the multiplication operation performed on each individual one of said set of at least some of said first set of complex values comprising multiplying said individual complex values by a complex value determined from at least some of said soft bits; d) summing said complex values in said second set of complex values to generate a complex sum, said complex sum being a complex value; e) generating a third set of complex values, said third set having the same number of elements as said first set of complex values, by separately subtracting from said complex sum one of said second set of complex values, each separate subtraction generating one of said third set of complex values; and f) multiplying. each element of said first set of complex values with the conjugate of a complex value from said third set to generate a fourth set of complex values, said fourth set having the same number of elements as the first and second sets, said complex values in said fourth set being . generated soft symbol values.

Full Text

EXTRACTING SOFT INFORMATION IN A BLOCK -CURRENT COMMUNICATIONS SYSTEM The present invention is directed to methods and apparatus for data communication over a block -channel and , more particularly, to method. for joint democulation and decoding for the purpose of forward detection correction. With block-coherent reception, the received symbol y(i0 and the transmitted symbol L(i) are related as follows. Figure 4 is no illustration of an exemplary embodiment of 21 module implemented in accordance with the invention which produces updated independent phase estimates from independent phase estimales using the known extrinsic rule. 124 is A representing the receiver's estimated recovery of orginal data stream A. The data path from data decoder 124 to demodulation 121, represents a feedback loop. The Feedback path include interleaver 123. The feedback corresponding to U1 are interleaved by an executable instrcution for casuing a machine, e,g., precessor and associated harware to perform one or more of the steps of the above-described method(s). Numerous additinal variation on the methods and apparatus of the present invention described above will be apparent to those skilled in the art in view of the above descrition of the invention. Such variation are to be considered withinthe scope of the invention. The methods and apparatus of the present invention may be, and in various embodiments are used with CDMA. orthogonal frequency division multiplexing (ODEDM) and/ore various order types of communications techniques which may be used to provide wireless communication links between access modes and mobile modes. In some embodiments the links with access nodes are implemented as base station which establish communication links with nodes using OFDM and/or CDMA. In various embodiments the mobile nodes are implemented as both book computers, personal data assistants (PDAs), or other portable devices including receiver/transmitter circuits and logic and/or routines, for implementing the methods of the present invention. What is claimed 1 1. A method of operating, a receiver apparatus to generate soli value form a set or complex. 1. 5. The method of claim 1, wherein there arew at least 3 soft hits per received complex 2. symbol value. 1 22, The method of claim 20. wherein for said complex symbol value that is modified in phase by a fixed preselected amount, the multiplkication is known and independent of soft bits. 1 25. THE APPARATUS CLAIM 23, WHEREIN SAID MEANS OFR GENERATING A THIRD SET OF COMPLEXC VALUES INCLUDES A DELAY LINE FOR DELAYING COMPLEX VALUES INCLUDED IN SAID SECOND SET OF COMPLEX VALUES, 2 includes a delay line delaying complex, values included in second sot or complex values 3 and coupled lo said delay line. 1 26. The apparatus of claim 23, wherein there are at least two soft bits per received complex symbol value.1 27. set of complex values with the conjugate of a complex value from said third set to generate a fourth set o complex value includes; 1. 27. set of complex values with the conjugate of a complex value from said third set to generate a

Documents:

2479-chenp-2005 abstract granted.pdf

2479-chenp-2005 claims granted.pdf

2479-chenp-2005 description(complete) granted.pdf

2479-chenp-2005 drawings 20-08-2009.pdf

2479-chenp-2005 drawings granted.pdf

2479-chenp-2005-abstract.pdf

2479-chenp-2005-assignement.pdf

2479-chenp-2005-claims.pdf

2479-chenp-2005-correspondnece-others.pdf

2479-chenp-2005-correspondnece-po.pdf

2479-chenp-2005-description(complete).pdf

2479-chenp-2005-drawings.pdf

2479-chenp-2005-form 1.pdf

2479-chenp-2005-form 26.pdf

2479-chenp-2005-form 3.pdf

2479-chenp-2005-form 5.pdf

2479-chenp-2005-form18.pdf

2479-chenp-2005-pct.pdf