Communication device and method for determining finger lock status in a radio receiver
US5754583A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | May 6, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/56
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication device (100) includes a plurality of receiver fingers (112, 114, 116) for receiving a spread spectrum communication signal. Each receiver finger includes a received signal strength indication (RSSI) circuit (130). The RSSI circuit (130) includes a filter (135) for filtering a pilot sample signal and producing a filtered signal. A comparator (144) producing a lock indication when the filtered signal exceeds lock threshold. A combiner (118) combines the traffic signal from each receiver finger in response to the lock indication from each finger. The unlock threshold for the finger is reduced to a level above the noise floor of the receiver finger, to reduce the likelihood of a finger unlocking during a fade. Also traffic symbols are immediately combined after a finger assignment using a weighted channel estimate to permit assigning a finger as locked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.