Spread Spectrum Random Access Schemes
Final rept. 15 Sep 1987-29 Nov 1990,
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER
Pagination or Media Count:
Detailed investigations have been carried out on frequency-hopped spread spectrum random access SSRA schemes in the presence of jamming, including control procedures for stable operation. Simulations also were carried out to verify and supplement the analytical results. It is shown that, unlike unspread systems, performance of a frequency-hopped packet communication network does not depend heavily on the burstiness of the user traffic or on whether slotted operation is used. Partial band and pulse jamming effects are modeled, and the possibility of successful reception of spreading code symbols with partial overlap is represented. Static and dynamic control policies are considered for slotted ALOHA-SSRA schemes, with emphasis on the effects of the retransmission control policy. Performance of dynamic control is shown to be very robust in that it provides high throughput over wide ranges of arrival rates, unlike static control, which is highly sensitive to packet generation process and the chosen retransmission probability.
- Radio Communications