Space-Time Optimum Combining for CDMA Overlay for Personal Communications Systems

Document Type

Article

Publication Date

1-1-1998

Abstract

The requirement to suppress narrowband interferences in CDMA communication stems from the overlay concept, i.e., coexistence of different types of signals in the same frequency band. This paper describes the performance analysis of a direct-sequence (DS) CDMA personal communication system sharing a common spectrum with narrowband microwave radio links in the 1.85 to 1.99 GHz band. The coexistence of these two systems within the same frequency band will improve the overall spectrum efficiency, but will also cause interference to both systems. In this paper it is shown that joint spatial and temporal optimum combining provides an efficient means of improving the performance of the DS-CDMA system through cancellation of the narrowband signal and the co-channel interferences. The proposed space-time architecture provides degrees of freedom for both diversity and interference cancellation. It is shown that the joint space-time receiver is robust with respect to the narrowband interference signal bandwidth and its carrier frequency offset from the DS-CDMA carrier frequency.

Identifier

0032027491 (Scopus)

Publication Title

Wireless Personal Communications

External Full Text Location

https://doi.org/10.1023/A:1008883722614

ISSN

09296212

First Page

295

Last Page

309

Issue

3

Volume

6

Grant

F30602-94-C-0135

Fund Ref

U.S. Air Force

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