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Time-frequency decorrelating decision-feedback multiuser detector over fast-fading multipath channels for synchronous DS-CDMA systems
Date
2001-03-23
Author
Ertug, O
Baykal, Buyurman
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
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RAKE receivers suffer degradation in performance under fast fading due to errors in channel state estimation. The wide-sense stationary uncorrelated scatterer channel model lends itself to time-frequency canonical representation, and provides additional diversity in the frequency axis. Using the joint multipath-Doppler diversity model based on this canonical representation, we propose a nonlinear time-frequency decorrelating decision-feedback multiuser detector for synchronous CDMA which utilizes decisions of the stronger users when forming the decisions for the weaker ones. Analytical and simulation results based on realistic fast-fading assumptions demonstrate that the proposed decision-feedback multiuser detector promises substantially improved bit-error-rate performance compared to time-frequency decorrelating multiuser detector for the weaker users, while the error probability of the weakest user approaches the single-user bound as the interferers grow stronger. The proposed detector exhibits strong resistance to the near-far effect for all users and the time-complexity-per-bit is linear in the number of users.
Subject Keywords
Code-division multiple access
,
Multiuser detection
,
Interference suppression
,
Time-frequency processing
,
Decision-feedback detection
,
Multipath
,
Diversity
,
Fast fading
URI
https://hdl.handle.net/11511/32774
DOI
https://doi.org/10.1109/spawc.2001.923874
Collections
Department of Electrical and Electronics Engineering, Conference / Seminar