Performance Analysis and Improvement of Decorrelating Detection for Multi-Rate DS/CDMA
Resource
IEEE COMMUNICATIONS LETTERS, VOL. 9, NO. 2, FEBRUARY 2005
Journal
IEEE Communications Letters
Journal Volume
VOL. 9
Journal Issue
NO. 2
Pages
-
Date Issued
2005-02
Date
2005-02
Author(s)
Lee, Huang
DOI
246246/200611150121518
Abstract
We study access strategies for decorrelating detection
applied in multi-rate direct-sequence code-division multipleaccess
(DS/CDMA) systems, including multi-modulation (MM),
multi-code (MC), and variable-spreading-length (VSL) schemes
by jointly considering signal constellations and multiple-access
interference. The mathematical analysis shows that when the
number of active users is large, the MM scheme outperforms MC
and VSL schemes especially for high-rate transmission. We also
conclude that the design of modulation is important in MC and
VSL schemes. Numerical analysis demonstrates that applying 4-
PSK instead of 2-PSK in MC and VSL schemes can improve
about 9 dB performance gain. In addition, by considering crosscorrelation
of noise components, we propose a detector that
minimizes the symbol error probability under the constraint that
the complexity grows linearly with the number of active users
as decorrelating detectors. Simulations show that about 4 dB
performance gain over conventional decorrelating detectors can
be achieved for multi-rate DS/CDMA communications.
Subjects
Decorrelating multiuser detection
code-division
multiple-access
multiple-access
multi-rate
multi-code
variable-spreadinglength
multi-modulation
Publisher
Taipei:National Taiwan University Dept Elect Engn
Type
journal article
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