Title :
Combined rate and power adaptation in DS/CDMA communications over Nakagami fading channels
Author :
Kim, Sang Wu ; Lee, Ye Hoon
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
fDate :
1/1/2000 12:00:00 AM
Abstract :
We consider combined rate and power adaptations in direct-sequence code-division multiple-access communications, where the transmission power and the data rate are adapted relative to channel variations. We discuss the power gain that the combined adaptations provide over power adaptation. Then, we consider an integrated voice and data transmission system that offers a constant bit rate voice service, using power adaptation and a variable bit rate data service with rate adaptation. We present an expression for the required average transmission power of each traffic type having different quality-of-service specifications and discuss the capacity gain over power adaptation for voice and data
Keywords :
channel capacity; code division multiple access; integrated voice/data communication; land mobile radio; multipath channels; multiuser channels; quality of service; spread spectrum communication; telecommunication traffic; BER; DS/CDMA communications; Nakagami fading channels; average transmission power; capacity gain; channel variations; constant bit rate voice service; direct-sequence code-division multiple-access; integrated voice/data transmission system; mobile radio; multipath fading; power adaptation; power gain; quality-of-service specifications; rate adaptation; traffic; transmission power; variable bit rate data service; Adaptive coding; Bit error rate; Bit rate; Data communication; Fading; Helium; Multiaccess communication; Quality of service; Radio link; Radio transmitters;
Journal_Title :
Communications, IEEE Transactions on
