Title :
Performance of the joint CDMA/PRMA protocol for voice transmission in a cellular environment
Author :
Brand, Alex E. ; Aghvami, A. Hamid
Author_Institution :
Centre for Telecommun. Res., King´´s Coll., London, UK
Abstract :
Joint CDMA/PRMA, a candidate for an uplink protocol for third generation mobile communication systems, controls the radio channel access such that the interference variance is reduced and the throughput increased, compared to random access CDMA. Joint CDMA/PRMA can either be viewed as an evolution of conventional PRMA, such that it can operate under direct-sequence (DS) CDMA conditions, or as an evolution of packet CDMA. Simulation results are presented for voice-only traffic in an isolated cell and in a cellular environment with path loss coefficients γ=4 and 3. The system under consideration employs random direct sequences with code length 7 and (511,229,38) BCH-coding. The voice coding rate is 8 kb/s, and a voice activity factor of 0.43 is assumed. In a no-fading/perfect power control environment, depending on the quality of service (QoS) requirements, for γ=3 an increase of 47 to 88 per cent in capacity can be achieved over random access CDMA
Keywords :
BCH codes; access protocols; cellular radio; code division multiple access; land mobile radio; packet reservation multiple access; pseudonoise codes; radio links; radiofrequency interference; spread spectrum communication; telecommunication traffic; voice communication; 8 kbit/s; BCH coding; QoS; cellular environment; code length; direct-sequence CDMA; intercell interference; interference variance reduction; joint CDMA/PRMA protocol; no-fading/perfect power control environment; path loss coefficients; quality of service; radio channel access; random access CDMA; random direct sequences; simulation results; system capacity; third generation mobile communication systems; throughput; uplink protocol; voice activity factor; voice coding rate; voice only traffic; voice transmission; 3G mobile communication; Access protocols; Communication system control; Control systems; Interference; Multiaccess communication; Quality of service; Radio control; Throughput; Traffic control;
Conference_Titel :
Communications, 1996. ICC '96, Conference Record, Converging Technologies for Tomorrow's Applications. 1996 IEEE International Conference on
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-3250-4
DOI :
10.1109/ICC.1996.541257
