Code-division-multiple-access (DS-CDMA) channels with aperiodic codes
US7376106B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2002 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Oct 3, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0204
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for channel estimation, includes receiving an input signal due to a superposition of waveforms encoding symbols transmitted respectively by a plurality of transmitters in a common frequency band. Each transmitter among the plurality of transmitters modulates the symbols with a respective spreading code. The input signal is sampled at sampling intervals over the duration of an observation period, thus providing a sequence of samples. The sequence of complex samples is processed to estimate a channel response for each of the transmitters by maximizing, individually for each of the transmitters and based on the respective spreading code of the transmitter, a likelihood of correctly decoding the transmitted symbols using the estimated channel response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.