Results 151 to 160 of about 5,465 (214)

Performance Evaluation and ParameterOptimization of MC-CDMA

IEEE Transactions on Vehicular Technology, 2006
The performance of multicarrier systems depends on the propagation channel behavior. The latter is subject to time and/or frequency selectivity. The designer has to select properly the guard interval and the number of carriers for a given system bandwidth to combat the channel dispersiveness. In this paper we investigate the sensitivity of MultiCarrier
Mamoun Guenach, Heidi Steendam
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Capacity optimisation in MC‐CDMA systems

European Transactions on Telecommunications, 2002
AbstractA novel efficient algorithm is proposed for the optimisation of capacity assignment in a MC‐CDMA system with an additional frequency division multiplexing component. Based on an estimate of the frequency‐selective channel, the algorithm optimises the assignment of the sub‐bands to the users with respect to the overall system capacity. Moreover,
Elena Costa, Harald Haas, Egon Schulz, Alessio Filippi   +3 more
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Adaptive Carrier Interferometry MC-CDMA

IEEE Transactions on Vehicular Technology, 2006
An adaptive carrier interferometry (CI) scheme is proposed for multicarrier code-division multiple-access (MC-CDMA) systems where it is assumed that there is a feedback channel between the receiver and the transmitter. By exploiting the additional degree of freedom in selecting the amplitudes of the subcarriers in accordance with the channel condition,
S. Sureshkumar, Ha H. Nguyen 0001, Ed Shwedyk   +2 more
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Design and performance analysis of the MC-CDMA

14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003., 2004
In this paper, the MC-CDMA (multicarrier code-division-multiple-access) design method, how to determine the length of guard interval is discussed. Also the BER performance in downlink channels with various receiver combining schemes is shown by computer simulation and an optimal combining method which gives an adaptiveness to the number of users is ...
Bong-Soo Lee, Sin-Chong Park
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On optimization of CI/MC-CDMA system

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications, 2009
This paper proposes a new model of high capacity carrier interferometry/multicarrier code division multiple access (CI/MCCDMA) system through the simultaneous support of high and low data rate transmission using odd and even subcarriers. Reduction in peak-to-average power ratio (PAPR) is achieved through the phase shift of even (odd) CI code using odd (
Santi Prasad Maity, Mithun Mukherjee 0001   +1 more
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Maximum likelihood combining for MC-CDMA

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367), 2003
This paper proposes a novel maximum likelihood combining (MLC) scheme for MC-CDMA systems. Currently, minimized mean square error combining (MMSEC) is widely considered the best combining scheme for MC-CDMA. The MLC proposed in this paper is optimal from the standpoint of minimizing the probability of error performance.
Zhiqiang Wu 0001, Carl R. Nassar, Suihua Lu   +2 more
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Power allocation algorithm in MC-CDMA

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003
We propose an algorithm to allocate power among subcarriers in an MC-CDMA system. The optimal power allocation coefficients turn out to be the maximum eigenvalue eigenvector of the modified projection matrix orthogonal to the interference signal subspace. We also present a simple on-off control algorithm to decrease feedback information.
Jianming Zhu, Yeheskel Bar-Ness
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The spatial dimension in the case of mc‐cdma

European Transactions on Telecommunications, 2002
AbstractAfter discussing basic possibilities to exploit the spatial dimension for wireless communications, a vector transmission model for MIMO channels is taken to investigate the potential of the spatial dimension for MC‐CDMA. For frequency‐selective channels it is shown that the spreading component of MC‐CDMA may already provide enough diversity, so
Jürgen Lindner, Christian Pietsch 0001
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The Sensitivity of MC‐CDMA to Synchronisation Errors

European Transactions on Telecommunications, 1999
AbstractIn this contribution, we investigate the sensitivity of MC‐CDMA systems to synchronisation errors. We show that the signal‐to‐noise ratio (SNR) of the MC‐CDMA system at the input of the decision device in the presence of a carrier frequency offset or a clock frequency offset is a rapidly decreasing function of the number of carriers.
Heidi Steendam, Marc Moeneclaey
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Complexity Reduction for MC-CDMA With MMSEC

IEEE Transactions on Vehicular Technology, 2008
The minimum mean square error combining (MMSEC) scheme performs best among various equalization and combining schemes for downlink multicarrier code-division multiple access (MC-CDMA). However, it is also the most computationally complex to realize as it involves the complex matrix inversion operation of a large matrix.
Keli Zhang, Yong Liang Guan 0001, Qinghua Shi   +2 more
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