Optimal power allocation for multirate CDMA systems with interference cancellation

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Abstract

In this paper, we will derive the optimal (minimal) power allocation and capacity for a multirate DS/CDMA system with various QoS requirements. Most of the previous work on power allocation only dealt with the conventional matched filter (MF) receiver and no multiuser detection (MUD) was considered. It is well known that MUD and in particular interference cancellation (IC) can be used to improve the system performance significantly. Hence, after proposing a novel graph-aided method to do optimal power allocation with the conventional MF receiver, Parallel IC (PIC) will be considered in multirate systems. We will propose an iterative approach to do optimal power allocation with PIC in multirate systems. It is shown that the proposed power allocation algorithm can converge to the optimal solution quickly. Furthermore, it is demonstrated that when PIC is combined with optimal power allocation, the power dissipation will decrease and the system capacity will increase significantly.

Original languageEnglish
Pages (from-to)1885-1889
Number of pages5
JournalIEEE International Conference on Communications
Volume6
Publication statusPublished - 2001
Externally publishedYes

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Multiuser detection
Matched filters
Code division multiple access
Energy dissipation
Quality of service

ASJC Scopus subject areas

  • Media Technology

Cite this

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