Title :
A comparison of the M-ary/SSMA ALOHA system and the DS/SSMA ALOHA system
Author :
Arai, Tsuyoshi ; Habuchi, Hiromasa
Author_Institution :
Dept. of Comput. & Inf. Sci., Ibaraki Univ., Japan
Abstract :
A comparison of the M-ary spread spectrum multiple access (M-ary/SSMA) ALOHA system and the direct sequence spread spectrum multiple access (DS/SSMA) slotted ALOHA system is evaluated when using the channel load sensing protocol (CLSP) as the traffic control. In particular, the throughput performance and the delay property of the both systems under additive white Gaussian noise and Rayleigh fading are derived. As a result, it is shown that the CLSP takes effect to improve the system performance of the M-ary/SSMA slotted ALOHA system and the DS/SSMA slotted ALOHA system under Rayleigh fading channel. The performance improvement of the M-ary/SSMA ALOHA system by using CLSP is larger than that of the DS/SSMA ALOHA system. The M-ary/SSMA slotted ALOHA system with CLSP is superior to the DS/SSMA slotted ALOHA system with CLSP
Keywords :
AWGN; Rayleigh channels; access protocols; land mobile radio; multi-access systems; multipath channels; multiuser channels; packet radio networks; spread spectrum communication; telecommunication control; telecommunication traffic; DS/SSMA slotted ALOHA system; M-ary spread spectrum multiple access; M-ary/SSMA slotted ALOHA system; Rayleigh fading; Rayleigh fading channel; additive white Gaussian noise; channel load sensing protocol; delay property; direct sequence spread spectrum multiple access; mobile radio; mobile stations; multipath fading; system performance; throughput performance; traffic control; AWGN; Bit error rate; Degradation; Delay; Fading; Interference; Packet radio networks; Spread spectrum communication; Throughput; Traffic control;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881674
