Noise shaping technique for spread spectrum communications
US5459758A · kind A · utility
12Cited by
8References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1993 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Nov 2, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/709709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A spread spectrum noise shaper uses a modulation technique to achieve a greater signal-to-noise or signal-to-interference ratio (SNR or SIR). The technique doubles the system SIR, in principle. This doubling yields a doubling in system capacity. SNR is increased by receiving the spread spectrum signal in the presence of less noise near the edge of the spread spectrum bandwidth. The technique requires only small additions to a conventional spread spectrum system, in the form of an extra modulator at the transmitter, and an extra demodulator and filter at the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.