The equalisation of a TDMA QPSK channel
Abstract
Techniques for minimizing data errors due to the effects of intersymbol interference in TDMA satellite communication channels are discussed, with a focus on the least-squares impulse-response estimation burst-mode link analyzer (LSIRE/BMLA) proposed by Mazur et al. (1983). The characteristics of adaptive nonlinear equalization, linear adaptive transversal equalization, and periodic manual equalization based on BLMA data are reviewed; radar, conventional, and LSIRE BMLAs are compared; and the results of numerical simulations of LSIRE/BMLA software are summarized. It is found that neither linear nor nonlinear adaptive equalizers can currently meet the needs of 120-Mb/s QPSK TDMA networks, but that LSIRE/BMLA is a feasible alternative, requiring only 4-bit sampling of the traffic signal for operation.
- Publication:
-
IN: National Space Engineering Symposium
- Pub Date:
- 1986
- Bibcode:
- 1986nse.....2.....K
- Keywords:
-
- Phase Shift Keying;
- Pulse Communication;
- Satellite Communication;
- Time Division Multiple Access;
- Intelsat Satellites;
- International Cooperation;
- Least Squares Method;
- Signal Transmission;
- Transmission Efficiency;
- Communications and Radar