Title :
Power allocation and spectral efficiency of DS-CDMA systems in fading channels with fixed QoS-part II: multiple-rate case
Author :
Li, Husheng ; Poor, H. Vincent
Author_Institution :
Qualcomm Inc., San Diego, CA
fDate :
9/1/2006 12:00:00 AM
Abstract :
Power allocation results for equal-rate systems developed in Part I are extended to multiple-rate systems. For both systems with and without channel state information at the transmitter (CSIT), conditions for the optimality of successive interference cancellation combined with minimum mean square error multiuser detection (SIC+MMSE) are obtained. When CSIT is available, the optimal decoding order is discussed for optimal SIC+MMSE and two sub-optimal decoding schemes. Explicit expressions for the spectral efficiency parameters in the low or high energy regions are also obtained
Keywords :
code division multiple access; decoding; fading channels; interference suppression; least mean squares methods; multiuser detection; quality of service; radiofrequency interference; spread spectrum communication; DS-CDMA systems; fading channels; fixed QoS; minimum mean square error; multiple-rate systems; multiuser detection; optimal decoding; power allocation; spectral efficiency; successive interference cancellation; Channel state information; Computer aided software engineering; Decoding; Fading; Interference cancellation; Mean square error methods; Multiaccess communication; Multiuser detection; Quality of service; Silicon carbide;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2006.1687776
