Unambiguously encoding and decoding signals for wireless channels
US7376173B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2004 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Jul 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/206
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple sub-blocks of complex numbers. Each sub-block is multiplied by a disambiguating spreading transform to obtain a sub-block of transformed symbols, which can be modulated and transmitted to a receiver, where each received block is demodulated to a block of complex numbers, which are partitioned into sub-blocks. The sub-block of complex numbers are converted to a set of likelihood ratios that correspond to decoded codewords. The input bits can be decoded unambiguously even if only one of the blocks of symbols corresponding to the block of input bits is received correctly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.