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. 29, 2000
Filed:
Sep. 06, 1996
Richard GC. Williams, San Diego, CA (US);
3Com Corporation, Santa Clara, CA (US);
Abstract
A method and apparatus for shell mapping that is independent of the number of bits to be mapped. Although the number of bits need to be known, the number does not affect the operation of the inventive algorithm and so filling with significant zeros may be used to obtain a large number of bits. This means that any tables used to efficiently implement the algorithm do not need to change when the data rate changes. In particular, the invention orders a set of shell combinations (the N-tuple [m.sub.1, m.sub.2, . . . m.sub.N ] defining a set of shell indices or selectors) such that any group of binary input bits having the same numerical value always selects a same shell combination.