Title :
DS SSMA with some IC realizations
Author :
Kemdirim, D.C. ; Wight, Jim S.
Author_Institution :
Dept. of Nat. Defense, Ottawa, Ont., Canada
fDate :
5/1/1990 12:00:00 AM
Abstract :
A direct-sequence spread-spectrum multiple-access (DS SSMA) system was examined, realized (hardware), and tested. Essentially, two transmitters were built: one had voice capability, whereas the other transmitted only binary data. Gold codes were used for the spreading sequence. The PN synchronization used a serial search technique for acquisition, and a tau-dither loop for tracking. A squaring loop and a differential encoding scheme (for carrier phase ambiguity) was used in the demodulation process, which was followed by conversion to a voice output when desired. The system was found to perform quite well under both single and multiple-access conditions. As a demonstration of the feasibility of implementing the system on chips, a few small blocks were put on ICs using CMOS technology. These performed as expected, and clearly demonstrated both the feasibility and attractiveness of a VLSI implementation
Keywords :
CMOS integrated circuits; VLSI; code division multiple access; digital radio systems; radio receivers; radio transmitters; spread spectrum communication; CMOS technology; Gold codes; IC realizations; PN synchronization; SSMA; VLSI implementation; acquisition; binary data; demodulation process; differential encoding scheme; direct-sequence; serial search technique; spread-spectrum multiple-access; spreading sequence; squaring loop; tau-dither loop; tracking; transmitters; voice capability; CMOS technology; Demodulation; Encoding; Gold; Hardware; Spread spectrum communication; System testing; System-on-a-chip; Tracking loops; Transmitters;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
