DocumentCode :
853706
Title :
Near-far resistance of linear receivers in chip-asynchronous CDMA systems with random signatures
Author :
Saquib, Mohammad
Author_Institution :
Wireless Commun. Res. Lab., Texas Univ. at Dallas, Richardson, TX, USA
Volume :
51
Issue :
12
fYear :
2003
Firstpage :
1975
Lastpage :
1978
Abstract :
The paper quantifies the robustness of linear receivers, such as minimum mean-squared error and decorrelating receivers against the near-far problem in chip asynchronous direct-sequence code-division multiple-access systems with random signatures, where both of those linear receivers achieve the optimum near-far resistance. Due to the asynchronism of the system, different symbols of a user see different interference structures which affect their performance differently. Thus, instead of concentrating on any particular symbol of a user, we analyze the average optimum near-far resistance of a randomly selected symbol of that user by providing simple tight upper and lower bounds on it.
Keywords :
code division multiple access; decorrelation; least mean squares methods; multiuser detection; radio receivers; radiofrequency interference; spread spectrum communication; DS-CDMA; MMSE receivers; chip-asynchronous CDMA systems; decorrelating receivers; direct-sequence code-division multiple-access; interference structures; linear receivers; minimum mean-squared error receivers; multiuser receivers; near-far resistance; random signatures; tight lower bounds; tight upper bounds; AWGN; Additive white noise; Decorrelation; Detectors; Helium; Intersymbol interference; Multiaccess communication; Robustness; Statistics; Upper bound;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2003.820728
Filename :
1256734
Link To Document :
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