NDLI: Packet data capacity in a wideband CDMA system

Content Provider	IEEE Xplore Digital Library
Author	Johansson, B.C.V.
Copyright Year	1998
Description	Author affiliation: Ericsson Radio Syst. AB, Stockholm, Sweden (Johansson, B.C.V.)
Abstract	An analytical formula similar to the Qualcomm capacity formula for speech is theoretically derived for cellular packet data with ARQ. The value of the target E/sub b//N/sub 0/ that gives the highest system capacity can from the formula together with the E/sub b//N/sub 0/ to BLER (block error rate) mapping be found. (We define a block to be the smallest unit that is re-transmissible on the air-interface.) The system capacity can be found except for a multiplicative constant which depends on the reuse and on the path loss function. System simulations aiming for confirming the theory has been performed for a downlink 32 kbps data channel in a CDMA test system with non-orthogonal DL. Results for the alpha-group concept (WCDMA) in ETSI are also shown. The optimal value of the target E/sub b//N/sub 0/ found by simulations is very close to the one given by the theory. Furthermore, the ratio of the capacity in the two cases investigated (with and without fast PC) is very close to what was predicted by the theory. The result in this paper indicate that using the theory makes it possible to optimize coding, interleaving and block size with respect to system capacity by only performing link simulations. Hence, system simulations are probably not needed for this optimization procedure.
Starting Page	1878
Ending Page	1883
File Size	543288
Page Count	6
File Format	PDF
ISBN	0780343204
ISSN	10903038
DOI	10.1109/VETEC.1998.686082
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	Wideband Multiaccess communication Speech analysis Automatic repeat request Error analysis Performance evaluation Downlink System testing Telecommunication standards Interleaved codes
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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