Reverse Link Capacity of Orthogonal Multi-Code DS-CDMA with Multiple Connections

Fumiyuki ADACHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E85-B   No.11   pp.2522-2526
Publication Date: 2002/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
Keyword: 
orthogonal multi-code system,  DS-CDMA,  reverse link capacity,  mobile communication system,  

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Summary: 
DS-CDMA provides a flexible support for the low-to-high bit rate of multimedia services upon a specific user's request. A simple capacity expression is derived for a power-controlled reverse link of orthogonal multi-code DS-CDMA with multiple connections. It is found that an orthogonal multi-code user having multiple connections is equivalent to a single connection user, but with a spreading factor reduced by a factor of the total number of parallel codes and a required signal energy per symbol-to-interference plus noise power spectrum density ratio which is the average taken over multiple connections. Furthermore, the use of antenna diversity is found equivalent to the use of higher spreading factor increased by a factor of the number of antennas.