Power control and diversity for the downlink of CDMA systems

Author

Jalali, A. ; Mermelstein, P.

Author_Institution

Bell-Northern Res., Verdun, Que., Canada

Volume

2

fYear

1993

fDate

12-15 Oct 1993

Firstpage

980

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICUPC.1993.528525

Filename

528525