Title :
Slotted ALOHA and code division multiple access techniques for land-mobile satellite personal communications
Author :
Van Nee, Richard D J ; Van Wolfswinkel, Rogier N. ; Prasad, Ramjee
Author_Institution :
Telecommun. & Traffic-Control Syst. Group, Delft Univ. of Technol., Netherlands
fDate :
2/1/1995 12:00:00 AM
Abstract :
The throughput and delay characteristics of a land-mobile satellite channel are analyzed for both slotted ALOHA. And slotted direct-sequence CDMA (code division multiple access), using binary phase shift keying (BPSK) modulation and forward error correction coding (FEC). In the case of CDMA, the application of path diversity techniques-maximal ratio combining and selection diversity-is also taken into account. Packet success probabilities are derived for both slow and fast fading, in order to evaluate the throughput and delay. Numerical results are presented for arbitrary code lengths and for specific values of the number of resolvable paths. It is shown that CDMA can offer a substantial improvement over slotted ALOHA, especially when the chip time is less than the delay spread
Keywords :
access protocols; code division multiple access; delays; diversity reception; fading; forward error correction; land mobile radio; mobile satellite communication; packet radio networks; personal communication networks; phase shift keying; pseudonoise codes; spread spectrum communication; BPSK; FEC; binary phase shift keying; chip time; code division multiple access; code lengths; delay characteristics; delay spread; fast fading; forward error correction coding; land-mobile satellite channel; land-mobile satellite personal communications; maximal ratio combining; packet success probabilities; path diversity; selection diversity; slotted Aloha; slotted direct-sequence CDMA; slow fading; throughput; Binary phase shift keying; Delay; Diversity reception; Fading; Forward error correction; Modulation coding; Multiaccess communication; Phase modulation; Satellites; Throughput;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
