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:
Apr. 15, 2014
Filed:
Oct. 28, 2011
Sebastian Eckert, Burgstaedt OT Mohsdorf, DE;
Sebastian Eckert, Burgstaedt OT Mohsdorf, DE;
Intel Mobile Communications Technology Dresden GmbH, Dresden, DE;
Abstract
A low complexity method for determining a search sequence of nodes for an efficient soft-decision sphere decoding algorithm for use in receivers for quadrature amplitude modulation (QAM) communication signals is achieved by determining a first member of the search sequence by rounding a received symbol (z) to a first constellation symbol (x) of the QAM constellation, classifying the remaining constellation symbols (x) of the QAM constellation into a plurality of sub-sets of constellation symbols having the same distance metric relative to said first constellation point (x) according to a metric d=2a·n=max{|real(x−x)|,|imag(x−x)|}, a being a scaling factor of the constellation grid, and ordering said sub-sets of constellation symbols in ascending order of their distance metric relative to the first constellation symbol (x), and ordering the members of each sub-set of constellation symbols that are defined by the same distance metric according to their Euclidean distances.