Multi-user code division multiple access receiver
US6240099A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 16, 1998 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Mar 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7095
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver and method for receiving a code-division multiple-access (CDMA) signal combining symbol values spread by a plurality of spreading codes, which method comprises the steps of: PA1 (a) converting the CDMA signal to a baseband signal; PA1 (b) recognizing symbol boundaries in every multipath for every user in the baseband signal to produce a delay estimate; PA1 (c) estimating an attenuation and phase rotation impressed on the signal by each multipath to produce channel estimates; PA1 (d) generating new symbol estimates for every user at a sampling rate that is greater than a symbol rate of the signal; PA1 (e) generating an estimate of the received signal using said symbol estimates and channel estimates; PA1 (f) comparing the received signal with its estimate and feeding estimation error back to a means for estimating the transmitted symbols; PA1 (g) sampling the symbol estimates at the estimated symbol boundaries of each user to obtain final symbol estimates; and PA1 (h) repeating steps (b) through (g) with every new sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.