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The sensitivity of downlink MC-DS-CDMA to carrier frequency offsets
IEEE Communications Letters, 2001We investigate the sensitivity of a downlink MC-DS-CDMA system to carrier frequency offsets. It is shown that the resulting interference power depends only on the ratio of the frequency offset to the carrier spacing. Hence, for given a frequency offset and system bandwidth, the MC-DS-CDMA performance degradation is independent of the spreading factor ...
Heidi Steendam, Marc Moeneclaey
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Code shift for intercarrier interference cancellation in MC-DS-CDMA
Signal Processing, 2004A method for intercarrier interference (ICI) mitigation in MC-DS-CDMA systems based on the autocorrelation properties of the CDMA codes is presented. The proposed transmission scheme does not imply additional complexity to the system and the bit error rate at the receiver reaches the bound of performance of a MC-DS-CDMA system without ICI.
Isabel Barbancho +2 more
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An analysis for MC- DS CDMA using optimized coding technique
2014 International Conference on Communication and Signal Processing, 2014This paper addresses Concatenation coding scheme for Multicarrier Direct Sequence Code Division Multiple Access (MC DS CDMA). It is to support high capacity & utilizing less power among all sub channels. While using Multicarrier Code Division Multiple Access (MC CDMA), it only spreads codes in frequency domain, but main disadvantage is no code ...
P. Vedasundravinayagam +2 more
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CFO-Resistant Receiver for Asynchronous MC-DS-CDMA Systems
2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07, 2007In this paper we propose a new receiving algorithm for MC-DS-CDMA systems when carrier frequency offset (CFO) is significant. By exploiting the special structure of the CFO contaminated signals, the new algorithm cancels CFO completely during the despreading procedure, after which the despreaded CFO-free signal is demodulated via normal FFT-based OFDM ...
Fan Ng, Xiaohua Li
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An image transmission system in MC-DS-CDMA with weight control
2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577), 2004This paper proposes a novel method for transmitting JPEG2000 images in MC-DS-CDMA taking into account the codestream structure. In the conventional MC-DS-CDMA that transmits the serial-to-parallel converted codestream by turns, the JPEG2000 image is corrupted by bit errors of the important parts of the codestream. To solve this problem, we determine an
Masao Ozawa +2 more
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Performance Analysis of DS-CDMA and MC-CDMA Systems
2018 9th IEEE Annual Ubiquitous Computing, Electronics & Mobile Communication Conference (UEMCON), 2018In this paper, a performance analysis of DS-CDMA and MC-CDMA is conducted. With DS-CDMA, data is spread using a spreading sequence in the time domain. In contrast, with MC-CDMA, data is spread over different sub-carriers using a spreading sequence in the frequency domain. The comparison of DS-CDMA and MC-CDMA is presented under an AWGN channel.
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Channel Estimation and Multiuser Detection for MC-DS/CDMA Systems
2006 IEEE 63rd Vehicular Technology Conference, 2006We propose a joint channel and data estimation scheme which does not require the training data in multicarrier direct-sequence multiple access (MC-DS/CDMA) systems. In order to eliminate the multiple access interference (MAI), the minimum output energy (MOE) filter is first used on each subcarrier because it can be implemented without the knowledge of ...
Bangwon Seo +2 more
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Adaptive MC-CDMA and MC-DS-CDMA receivers for multiuser and multipath fading communications
Proceedings of the 2006 international conference on Wireless communications and mobile computing, 2006OFDM is a promising scheme for multicarrier (MC) transmission, since it has the advantage of high spectral efficiency, robustness to frequency selective fading, and feasibility of low-cost transceiver implementation. The combination of OFDM and CDMA, referred to as OFDM-CDMA, recently attracted most research interests in wireless communications.
Fang-Biau Ueng +5 more
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Efficient simulation of coded MC-DS-CDMA systems
IEEE Transactions on Microwave Theory and Techniques, 1999We use computer simulations to compare the performance improvements associated with coding on a Gaussianized binary phase-shift keying (BPSK) multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA) system and a nonGaussianized differential phase-shift keying (DPSK)-MC-DS-CDMA system.
T.B. Welch, R.E. Ziemer
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Comparison of the sensitivities of MC-CDMA and MC-DS-CDMA to carrier frequency offset
IEEE Benelux Chapter on Vehicular Technology and Communications. Symposium on Communications and Vehicular Technology. SCVT-2000. Proceedings (Cat. No.00EX465), 2002We consider the effect of carrier frequency offset on the performance of MC-CDMA and MC-DS-CDMA, which are both combinations of the multicarrier transmission technique and the CDMA multiple access technique. We show that both systems strongly degrade in the presence of a carrier frequency offset. Furthermore, we show that, for a given spreading factor,
H. Steendam, M. Moeneclaey
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