Title :
Capacity of a DS-CDMA system supporting mixed modulation
Author_Institution :
Centre for Wireless Commun., Oulu Univ., Finland
Abstract :
Future mobile systems currently being designed propose to support a wide mix of traffic types and levels of quality of service (QoS) for users. High data rates are supported through mixed modulation schemes and QoS is sometimes achieved by allowing users to request higher signal powers. This paper examines the effect on the capacity of a CDMA system of offering preferential data rates to selected users through higher order modulation. The CDMA system is based on the use of near far resistant LMMSE receivers and operates over a fading wireless local loop (WLL) channel
Keywords :
channel capacity; code division multiple access; data communication; land mobile radio; least mean squares methods; multiuser channels; quadrature amplitude modulation; quadrature phase shift keying; quality of service; radio access networks; radio receivers; signal detection; spread spectrum communication; telecommunication traffic; 16-QAM; AWGN channel; DS-CDMA system capacity; LMMSE detector; QPSK; QoS levels; fading channel; high data rates; high signal power; higher order modulation; mixed modulation; mobile systems; near far resistant LMMSE receivers; quality of service; traffic types; wireless local loop; 3G mobile communication; Bandwidth; Bit error rate; Bit rate; Error analysis; Least squares approximation; Multiaccess communication; Quality of service; Telephony; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.775834
