Systems and methods for receiving a modulated signal containing encoded and unencoded bits using multi-pass demodulation
US6366624B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03273
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and systems are provided for receiving a modulated signal including symbols representing both encoded and unencoded bits from a data (e.g., speech) frame where a received slot is first demodulated and the encoded bits are decoded. The decoded bits are then utilized to constrain demodulation during a second demodulation of a received slot. The encoded bit positions from the constrained second demodulation are, in turn, encoded to generate bit estimates for the received slot. This information is combined with the output of the constrained second demodulation for unencoded bits to provide a received data frame estimate which has been shown to have improved reliability for both encoded and unencoded bits. The methods and systems further provide for recursively repeating the demodulation and decoding steps until a counter expires or a desired reliability is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.