Performance of code division multiple access (CDMA) systems in Nakagami multipath fading channel

2002 ◽  
Author(s):  
S.M. Elnoubi ◽  
A.A. Hashem
Keyword(s):  
Fading Channel ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Multipath Fading ◽  
Multipath Fading Channel ◽  
Cdma Systems ◽  
Code Division Multiple

scholarly journals A Blind Two-Stage Receiver for MIMO-CDMA Systems

2011 ◽  
Vol 2011 ◽  
pp. 1-7
Author(s):  
Fuh-Hsin Hwang ◽  
Tsui-Tsai Lin
Keyword(s):  
Multiple Access ◽  
Mean Squared Error ◽  
Multiple Input Multiple Output ◽  
Multiple Access Interference ◽  
Multipath Fading ◽  
Two Stage ◽  
Multipath Fading Channel ◽  
Minimum Mean Squared Error ◽  
Cdma Systems ◽  
Code Division Multiple

A blind two-stage multiple-input multiple-output (MIMO) receiver is proposed for code-division multiple access (CDMA) systems utilizing space-time block coding (STBC) over a multipath fading channel. Specifically, in the first stage, a signal-blocked (SB) interference-blocked (IB) detector is first constructed for collection of the desired signals and suppression of multiple access interference (MAI). In the second-stage, a decision-directed scheme is developed to alleviate desired signal cancellation. Computer simulations demonstrate that the proposed blind receiver can achieve a reliable output signal-to-interference-plus-noise ratio (SINR) performance approximating that of the optimal minimum mean squared error (MMSE) receiver and can exhibit the robustness against the finite data sample effect.

Performance Analysis of Multicarrier Code Division Multiple Access over Rayleigh Fading Channel

2012 ◽  
Vol 457-458 ◽  
pp. 985-988
Author(s):  
Jia Uddin ◽  
Mohammed Faisal ◽  
Md. Facihul Azam ◽  
A.F.M. Muzahidur Rahman
Keyword(s):  
Fading Channel ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Rayleigh Fading ◽  
Multipath Fading ◽  
Rayleigh Fading Channel ◽  
Frequency Diversity ◽  
High Data ◽  
Rate Transmission ◽  
Code Division Multiple

Recently, multi-carrier transmission schemes have been introduced into Code Division Multiple Access (CDMA) systems to gain advantages for high data rate transmission as well as security. Due to pseudorandom code there is no chance to Inter Symbol Interference (ISI). There are different techniques to mitigate multipath fading. One of the method is to transmit identical narrowband direct-sequence (DS) waveforms in parallel over a number of sub-channels using frequency diversity. Implementation this multi-carrier modulation technique in CDMA system is known as multi-carrier CDMA (MC-CDMA). In Rayleigh fading channel, due to multi-carrier modulation, when one subcarrier goes deep fade another subcarrier may remain safe. Therefore it combats multi-path fading and signal can be received in low bit error rate.

Robust MVDR Estimation via Polynomial Rooting for MC-CDMA Carrier Frequency Offset

2013 ◽  
Vol 284-287 ◽  
pp. 2687-2693
Author(s):  
Ing Jiunn Su ◽  
Chiao Chan Huang
Keyword(s):  
Carrier Frequency ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Carrier Frequency Offset ◽  
Low Complexity ◽  
Frequency Offset ◽  
High Accuracy ◽  
Cdma Systems ◽  
Code Division Multiple ◽  
Polynomial Rooting

In this letter, we present a blind carrier frequency offset (CFO) estimator by exploiting the polynomial rooting technique for multicarrier-code division multiple access (MC-CDMA) systems. Relative high accuracy and low-complexity to the CFO estimation can be achieved by rooting a polynomial. Simulation results are provided for illustrating the effectiveness of the proposed blind polynomial rooting estimator.

scholarly journals The Channel Shortening comparison between OFDM & MC-CDMA System over an ADSL Channel using a Water-filling

2019 ◽  
Vol 9 (5) ◽  
pp. 3695
Author(s):  
Bouasria Fatima
Keyword(s):  
System Performance ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Digital Transmission ◽  
Cdma System ◽  
Channel Shortening ◽  
Multiple Paths ◽  
Water Filling ◽  
Cdma Systems ◽  
Code Division Multiple

<p>In this paper our objective focuses on the development of digital transmission techniques in order to solve the problem of Inter-Symbol Interference (ISI) due to multiple paths and the improvement of Multi-Carrier Code Division Multiple Access (MC-CDMA) system performance. The both algorithm: MERRY algorithm (Multicarrier Equalization by Restoration of Redundancy) called TEQ (Time domain EQualizer) and the power allocation method to allocate appropriate power to each user (Water-filling technique (WF)) [1] is used. Finally, the numerical results show that combining Water Filling with TEQ technique allows to reduce the ISI for MC-CDMA systems.</p>

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