Title :
Acquisition dependent random access for connectionless CDMA systems
Author :
Yener, Aylin ; Yates, Roy D.
Author_Institution :
Wireless Inf. Network Lab., Rutgers Univ., NJ, USA
Abstract :
We consider connectionless packet switched CDMA systems where all users have to share a common bandwidth and signature sequence on a contention basis. Multiple access is achieved by the simultaneous acquisition of different users´ spread spectrum transmissions. The throughput of a pure random access system of this kind suffers from acquisition errors and timing mismatches of the active users as well as instability issues. We consider schemes that use information available at the physical layer, i.e., at the output of the multiuser access detector (MUAD) designed for this random access system, to improve and stabilize the throughput. We consider timing randomization, pseudo-Bayesian stabilization and collision resolution algorithms and report the corresponding numerical results
Keywords :
Bayes methods; access protocols; channel capacity; code division multiple access; multiuser channels; packet radio networks; packet switching; random processes; signal detection; spread spectrum communication; timing; acquisition dependent random access; acquisition errors; bandwidth sharing; capacity enhancement; collision resolution algorithms; connectionless packet switched CDMA systems; instability; multiuser access detector; pseudo-Bayesian stabilization; pure random access system; random access system; signature sequence sharing; spread spectrum transmission; throughput; timing mismatches; timing randomization; Delay effects; Detectors; Frequency conversion; Laboratories; Multiaccess communication; Packet switching; Physical layer; Spread spectrum communication; Throughput; Timing;
Conference_Titel :
Wireless Communications and Networking Confernce, 2000. WCNC. 2000 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-6596-8
DOI :
10.1109/WCNC.2000.904622