Thomas G. Macdonald

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In large multiuser systems, such as communications satellites, the dynamic allocation of resources enables the system to simultaneously maximize usable throughput and provide acceptable communications quality to all users. In this paper the dynamic allocation problem for satellite communications is discussed. We present a multiple-rate time division(More)
Information about the reliabilities of the received symbols is very beneficial in slow-frequency-hop communication systems. This information, referred to as side information, can be used to erase unreliable symbols at the input to an errors-and-erasures decoder. It is common that special redundant symbols, referred to as side-information symbols, are(More)
Tactical wireless mobile ad hoc networks rely upon distributed medium access control (MAC) protocols for coordination and assignment ofchannel resources among dispersed and mobile users. One such protocol is the distributed time division multiple access (TDMA) scheme where different users contend for time slots via a signaling mechanism. Several key(More)
The processing that is often employed in receivers for quaternay direct-sequence spread-spectrum communications operates separately on the inphase and quadrature components of the spread-spectrum signal. Recent results on quaternary complex sequences, which are also referred to as four-phase sequences, provide a strong motivation to emplo~ processing(More)