Transmitter and receivers using resource sharing and coding for increased capacity
US4495619A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1984 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Feb 13, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0015
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to transmitters and receivers in a digital time division multiple access (TDMA) communication system wherein the resource sharing concept is generalized by fully exploiting the available clear air carrier-to-noise ratio (CNR) of a transmission link to achieve very high transmission capacity while maintaining low rain outage. Transmission is accomplished by using a first predetermined redundancy code and a first predetermined signal constellation for quadrature amplitude modulation during clear air conditions to permit a high rate of information transfer. When the fade depth exceeds the built-in fade margin, a second predetermined redundancy code and a second predetermined signal constellation is used while using time slots borrowed from a resource sharing reserved time slot pool to maintain the data rate at the fade site. Either one of the first redundancy code or signal constellation can equal either one of the second redundancy code or signal constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.