NDLI: A combined power/rate control scheme for data transmission over a DS/CDMA system

Content Provider	IEEE Xplore Digital Library
Author	Hashem, B. Sousa, E.
Copyright Year	1998
Description	Author affiliation: Dept. of Electr. & Compt. Eng., Toronto Univ., Ont., Canada (Hashem, B.)
Abstract	Power control is essential for spread spectrum cellular systems. Perfect power control can result in high intercell interference due to tracking of deep fades. Limiting the user transmitted power will not solve this problem because this will suppress both the interference and the signal itself. We investigate the performance of data users that can tolerate some delay in their transmission. We limit the increase in power to compensate for multipath fading by P/sub l/(dB) and get the extra gain required by reducing the transmission rate. We show that this can result in about a 231% increase in the total transmission rate when the multipath fading consists of a single Rayleigh path. A major issue in this scheme will be tracking the transmission rate by the base station to use it in the demodulation process which is a difficult task when the gain commands can be in error. In this case we propose using only four different transmission rates (R/sub m/, R/sub m//2, R/sub m//4, R/sub m//8) and the base station will demodulate the received signal four times for the four different rates and then pick one data sequence based on metrics like the CRC pass/fail. We show that in such a case, the increase in the total transmission rate can reach 187%.
Starting Page	1096
Ending Page	1100
File Size	522346
Page Count	5
File Format	PDF
ISBN	0780343204
ISSN	10903038
DOI	10.1109/VETEC.1998.686409
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-21
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Control systems Data communication Multiaccess communication Interference Power control Fading Base stations Rayleigh channels Bit error rate Shadow mapping
Content Type	Text
Resource Type	Article

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