Title :
Power control and diversity for the downlink of CDMA systems
Author :
Jalali, A. ; Mermelstein, P.
Author_Institution :
Bell-Northern Res., Verdun, Que., Canada
Abstract :
The authors study the capacity of a CDMA-based microcellular wireless system in the base to portable (downlink) direction. Narrowband CDMA with system bandwidth of 1.25 MHz is considered. Coherent reception using a pilot signal, BPSK modulation with 1/2 convolution codes, and power control are considered. Capacity of the downlink is evaluated as a function of multipath diversity, path loss exponent, and power control strategies. Both slow and fast power control on the downlink are considered. With slow power control, the capacity is severely limited. It is observed that fast power control significantly improves the capacity of the downlink. Finally, the effect of path loss exponent on the downlink capacity is illustrated
Keywords :
cellular radio; channel capacity; code division multiple access; convolutional codes; diversity reception; land mobile radio; losses; multipath channels; power control; telecommunication control; 1.25 MHz; 1/2 convolution codes; BPSK modulation; CDMA-based microcellular wireless system; capacity; downlink; multipath diversity; path loss exponent; power control; Bandwidth; Bit error rate; Delay; Downlink; Fading; Frequency; Modulation coding; Multiaccess communication; Narrowband; Power control;
Conference_Titel :
Universal Personal Communications, 1993. Personal Communications: Gateway to the 21st Century. Conference Record., 2nd International Conference on
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-1396-8
DOI :
10.1109/ICUPC.1993.528525
