System and method using polar coordinate representation for quantization and distance metric determination in an M-PSK demodulator
US6421400B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/186
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital communications receiver is provided with a PSK demodulator and a soft-decision decoder. The PSK demodulator is configured to accept a receive signal and responsively produce quantized baseband signal components which include a quantized radial component RQ and a quantized angular component &thgr;Q. The soft-decision decoder is coupled to the PSK demodulator to receive the quantized baseband signal components and is configured to convert the quantized signal components into decoded information bits. The soft-decision decoder preferably uses a squared Euclidean distance metric calculation for the decoding process. Using polar coordinate quantization provides an improved performance relative to Cartesian coordinate quantization. A new distance metric for TCM decoding is also provided which requires less implementation complexity than a standards Euclidean distance metric calculation, and which suffers no significant performance loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.