Abstract
The superposition of a spread-spectrum multiple-access (SSMA) signal transmission over a quadrature phase-shift-keyed (QPSK) modulated channel is proposed to achieve higher transmission efficiency per transponder and to reduce the lower transmitter power of a small earth station. Experimental results show that under the condition of D/U = 20 dB, the required error probability, Pe = 1 × 10-4, of the QPSK channel is achieved with only 1-dB degradation by using a coding rate of 7/8 forward error correction (FEC), and the required Pe of 1 × 10-4 for the SSMA channel is achieved with 7-dB degradation by using a coding rate of = 1/2 FEC. The link budget shows that the proposed scheme makes it possible to use a low-power SSPA to realize small earth stations.
| Original language | English |
|---|---|
| Title of host publication | GLOBECOM '90 |
| Publisher | Publ by IEEE |
| Pages | 751-755 |
| Number of pages | 5 |
| Volume | 2 |
| ISBN (Print) | 0879426322 |
| Publication status | Published - 1990 Dec 1 |
| Event | IEEE Global Telecommunications Conference & Exhibition Part 3 (of 3) - San Diego, CA, USA Duration: 1990 Dec 2 → 1990 Dec 5 |
Other
| Other | IEEE Global Telecommunications Conference & Exhibition Part 3 (of 3) |
|---|---|
| City | San Diego, CA, USA |
| Period | 90/12/2 → 90/12/5 |
ASJC Scopus subject areas
- Engineering(all)