ALOHA/TDM systems with multiple downlink capacity
Abstract
The concept of a processing satellite with multiple slotted ALOHA uplinks to efficiently fill a TDM downlink is extended to include multiple downlinks. Throughput is derived for a general configuration with n ALOHA uplinks and m TDM downlinks. An optimization procedure is described to select the n and m which maximize throughput for a given bandwidth constraint. The ALOHA/TDM system with multiple downlink capacity is found to be up to 32% more spectrum-efficient than the conventional slotted ALOHA system. The ALOHA/TDM system also has the potential for payload power and weight savings and decreased passive intermodulation problems.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- March 1979
- Bibcode:
- 1979ITCom..27..537E
- Keywords:
-
- Aloha System;
- Bandwidth;
- Channel Capacity;
- Communication Satellites;
- Down-Converters;
- Time Division Multiplexing;
- Optimization;
- Spacecraft Communication;
- Transmitter Receivers;
- Transponders;
- Communications and Radar