Adaptive multiuser detector for synchronous code division multiple access applications

1994 ◽  
pp. 67-75 ◽  
Author(s):  
Zoran Siveski ◽  
Yeheskel Bar-Ness ◽  
David W. Chen
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Multiuser Detector ◽  
Code Division Multiple

NOVEL LOW-COMPLEXITY ANT COLONY BASED MULTIUSER DETECTOR FOR DIRECT SEQUENCE CODE DIVISION MULTIPLE ACCESS

2005 ◽  
Vol 05 (02) ◽  
pp. 201-214 ◽  
Author(s):  
SAMER L. HIJAZI ◽  
BALASUBRAMANIAM NATARAJAN
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Low Complexity ◽  
Foraging Strategy ◽  
Ant Colony ◽  
Direct Sequence ◽  
Multiuser Detector ◽  
Sequence Code ◽  
Cooperative Foraging ◽  
Code Division Multiple

In this paper, we present a novel multiuser detection (MUD) technique based on ant colony optimisation (ACO), for synchronous direct sequence code division multiple access systems. ACO algorithms are based on the cooperative foraging strategy of real ants. While an optimal MUD design using an exhaustive search method is prohibitively complex, we show that the ACO-based MUD converges to the optimal bit-error-rate performance in relatively few iterations providing 95% savings in computational complexity. This reduction in complexity is retained even when considering users with unequal received powers.

scholarly journals Limited-Search Chase Decoding Algorithm for LDPC Coded Underwater Acoustic Multiuser Channels

2021 ◽  
pp. 76-81
Author(s):  
Xingming Li ◽  
◽  
Zhiliang Qin ◽  
Yuanhao Sun ◽  
Qidong Lu ◽  
...  
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Low Complexity ◽  
Underwater Acoustic ◽  
Correlated Channels ◽  
Multiuser Detector ◽  
Acoustic Networks ◽  
Lower Complexity ◽  
Highly Correlated ◽  
Code Division Multiple

In this paper, we propose a low-complexity soft-input/soft-output (SISO) Chase multiuser detector that has a polynomial computational complexity in terms of the number of the least reliable bit positions for low-density parity-check (LDPC) coded code-division multiple-access (CDMA) systems, which is a potentially competitive technology for underwater acoustic networks (UWAN). Simulation results over highly correlated channels show that the proposed detector can afford searching over a larger number of the least reliable bit positions and achieve better bit-error-rate (BER) performance as compared with the Chase-II detector at much lower complexity.

Sign in / Sign up

Export Citation Format

Share Document