Method for detecting short codes in CDMA systems
US6414951B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Oct 8, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7115
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for receiving a transmitted signal in a communication system employing CDMA techniques wherein the transmitted signal includes a plurality of short codes, each of which is transmitted repetitively over a fixed period of time and where the received signal has CW interference in addition to the transmitted signal. The method includes using a Sequential Ratio Probability Test (SPRT) for detecting the presence of the short code in a plurality of time phases of the received signal by calculating a likelihood ratio for each phase. A likelihood ratio is a comparison of the signal's Probability Distribution Function (PDF) with a background noise PDF. The background noise PDF is calculated by combining in the RAKE the current short code with the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.