Single side-band modulation system for use in digitally implemented multicarrier transmission systems
US5631610A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1996 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Jan 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D1/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication system having a modulation system for transmitting a symbol set via a single side-band modulated carrier and a demodulation system for recovering the in-phase and quadrature signals from the modulated carrier. The modulation circuit receives M symbol values and generates M time domain samples for each of the in-phase and quadrature signals. The in-phase and quadrature signals can then be combined to generate the single side-band modulated carrier. The modulation circuit includes a transform circuit for generating M transformed symbol values by computing the transform of the M symbol values. A polyphase filter bank having 2M FIR filters is used to process the output of the transform circuit. Each filter has g taps, where g is an integer greater than 1. The outputs of the polyphase filters are combined with the outputs of the polyphase filters generated from a previously received set of M symbols to generate the M time-domain signal values of the in-phase signal. The quadrature signal is generated by a similar circuit having two additional elements. The demodulation circuit recovers symbol sets from the in-phase or quadrature signals generated from M received time-dom…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.