Differentially coherent parallel interference cancellation for DS-CDMA

Author

Schober, Robert ; Lampe, Lutz

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada

Volume

4

Issue

3

fYear

2005

fDate

5/1/2005 12:00:00 AM

Firstpage

1030

Lastpage

1039

Abstract

In this paper, we propose a novel differentially coherent (DC) parallel interference cancellation (PIC) scheme for direct-sequence code-division multiple access (DS-CDMA) employing differential phase-shift keying (DPSK). The proposed scheme combines decision-feedback differential detection (DF-DD) and PIC. For optimization of the DF-DD and interference cancellation (IC) filters three different criteria are adopted. The first (DC-PIC I) and the second (DC-PIC II) criteria assume a constant channel and a channel with a small constant frequency offset, respectively, whereas the third criterion (DC-PIC III) optimizes the filters in the minimum mean-squared error (MMSE) sense taking into account the statistical properties of the underlying channel. Simulations show the high achievable performance and the robustness of the novel DC-PIC receiver. A comparison with linear DC receivers and a previously proposed DC-PIC scheme show the superiority of the proposed approach.

Keywords

code division multiple access; differential phase shift keying; feedback; interference suppression; least mean squares methods; multiuser detection; optimisation; radio receivers; radiofrequency interference; spread spectrum communication; statistical analysis; telecommunication channels; DPSK; DS-CDMA; MMSE; decision-feedback differential detection; differential phase shift keying; differentially coherent parallel interference cancellation; direct-sequence code-division multiple access; filters optimization; minimum mean-square error; receivers; statistical properties; Differential phase shift keying; Differential quadrature phase shift keying; Direct-sequence code-division multiple access; Downlink; Filters; Frequency; Interference cancellation; Multiaccess communication; Multiuser detection; Phase detection; Differentially coherent detection; differential phase-shift keying (DPSK); direct-sequence code-division multiple access (DS-CDMA); multiuser detection;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2005.847024

Filename

1427693