Near-Instantaneously Adaptive HSDPA-Style OFDM Versus MC-CDMA Transceivers for WIFI, WIMAX, and Next-Generation Cellular Systems

Hanzo, Lajos; Choi, Byoung-Jo

doi:10.1109/jproc.2007.904445

Cited by 15 publications

(7 citation statements)

References 184 publications

(161 reference statements)

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“…One problem is the associated increased Peak-to-Average Power Ratio (PAPR) in comparison with single-carrier systems [13], requiring a large linear range for the OFDM transmitter"s output amplifier. In addition, OFDM is sensitive to carrier frequency offset, resulting in Inter-Carrier Interference (ICI) [17]. form of distortion of a signal in which one symbol interferes with subsequent symbols.…”

Section: Ofdm Advantages and Disadvantagesmentioning

confidence: 99%

Investigation of LTE Receivers in Term of Channel Equalization Techniques in LTE Downlink

2016

IJSR

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In this paper we will introduce a comprehensive study based on LTE techniques that are used in order to eliminate or reduce different types of interferences that happens in the wireless communication channel and affect the received signal at receivers which associated with channel equalization techniques by comparing between three different techniques which are the Zero Forcing ZF, the Minimum Mean Square Error MMSE and the Soft Sphere Decoding SSD. Also different types of modulations are considered such as QPSK, 16QAM, and 64QAM. The comparison is performed for different transmission modes such as SISO, SIMO, and MIMO. And the results show that for SISO and MIMO the MMSE has the advantage over the ZF equalizer, and in SIMO the ZF is performing better than the MMSE, and finally for the MIMO we figure that the SSD equalizer has advantage over both other equalizers.

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Section: Ofdm Advantages and Disadvantagesmentioning

confidence: 99%

Investigation of LTE Receivers in Term of Channel Equalization Techniques in LTE Downlink

2016

IJSR

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“…After centering y and projecting on the signal subspace, take a small initial vector w(0) = 0.01c 1 . Let iteration number p = 0.…”

Section: Differential Socp-ica Detectionmentioning

confidence: 99%

“…The use of multicarrier code division multiple access (MC-CDMA) has recently been proposed for future wireless communication systems, and cellular networks in particular [1], due to its high data rate or spectrum efficiency over frequency-selective fading channels [2,3]. MC-CDMA combines orthogonal frequency-division multiplexing (OFDM) with CDMA to spread the data symbol in the frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Blind ICA detection based on second-order cone programming for MC-CDMA systems

Jen

Jou

2014

EURASIP J. Adv. Signal Process.

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The multicarrier code division multiple access (MC-CDMA) technique has received considerable interest for its potential application to future wireless communication systems due to its high data rate. A common problem regarding the blind multiuser detectors used in MC-CDMA systems is that they are extremely sensitive to the complex channel environment. Besides, the perturbation of colored noise may negatively affect the performance of the system. In this paper, a new coherent detection method will be proposed, which utilizes the modified fast independent component analysis (FastICA) algorithm, based on approximate negentropy maximization that is subject to the second-order cone programming (SOCP) constraint. The aim of the proposed coherent detection is to provide robustness against small-to-medium channel estimation mismatch (CEM) that may arise from channel frequency response estimation error in the MC-CDMA system, which is modulated by downlink binary phase-shift keying (BPSK) under colored noise. Noncoherent demodulation schemes are preferable to coherent demodulation schemes, as the latter are difficult to implement over time-varying fading channels. Differential phase-shift keying (DPSK) is therefore the natural choice for an alternative modulation scheme. Furthermore, the new blind differential SOCP-based ICA (SOCP-ICA) detection without channel estimation and compensation will be proposed to combat Doppler spread caused by time-varying fading channels in the DPSK-modulated MC-CDMA system under colored noise. In this paper, numerical simulations are used to illustrate the robustness of the proposed blind coherent SOCP-ICA detector against small-to-medium CEM and to emphasize the advantage of the blind differential SOCP-ICA detector in overcoming Doppler spread.

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“…The turbo and STBC codes in CDMA performance are also appraised through minimizing complexity of receiver for multi-users [7]. In [8], a multistage receiver was designed with the help of MMSE and interference cancellation method.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Diversity Gain with and without Coding Gain in MIMO for Emerging Wireless Networks

Kaimkhani¹,

Chen²,

Yin³

2017

IJCTE

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The wireless networks are growing rapidly that cause constraint in data rate and power consumption. The multiple-input multiple-output (MIMO) has incredible performance to overcome the limitations by spatial multiplexing gain. Spatial multiplexing gain is achieved with the help of space time encoding technique in which a high rate signal splitting into multiple lower rate streams and transmitting them through the different antennas. This paper provides a comprehensive comparative study of diversity gain with and without coding gain for 4 × 2 and 4 × 4 MIMO systems. The coding gain is explored through turbo coding (TC) with ½ and ¾ coding rates, and diversity gain is adopted by orthogonal space time coding (OSTBC). Turbo coding is useful to reduce the forward error correction in multiplexed data transmissions. The compounding of OSTBC and turbo coding is valuables to increase data rate and reduce energy consumption by reducing bit error rate in emerging wireless network transmissions. Simulation results convinced the validity of proposed scheme. He has a bachelor degree in electronics engineering from Sir Syed University of Engineering and Technology, Karachi, Pakistan and master's degree in computer and communication networks from Telecom & Management SudParis (ex INT), Evry, France. He has worked as a lecturer and the head of the Network Department from 2007 to 2009 at Universities of Engineering Science and Technology of Pakistan (UESTP-France), Karachi, Pakistan and also work as an assistant professor from 2009 to 2011 at COMSATS Institute of information Technology, Abbottabad, Pakistan. His main research areas include, MIMO, beamforming, WiMax over GSM/GPRS network, physical layer of wireless network, energy efficient wireless network.Zhe Chen received his B.S degree in electronics engineering, the M.S degree in signal and information processing, and the PhD. degree in signal and information processing from Dalian university of Technology (DUT), Dalian, China, in 1996, 1999 and 2003 respectively. He joined the Department of electronics Engineering, DUT, as a lecturer in 2002, and become an associate professor in 2006. His research includes speech processing, image processing and wideband wireless communication. Fuliang Yin was born in Fushun city, Liaoning province, China, in 1962. He received the B.S. degree in electronic engineering and M.S. degree in communications and electronic systems from Dalian University of Technology (DUT), Dalian, China, in 1984 and 1987, respectively. He

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Near-Instantaneously Adaptive HSDPA-Style OFDM Versus MC-CDMA Transceivers for WIFI, WIMAX, and Next-Generation Cellular Systems

Abstract: Various techniques that are designed to allow future wireless systems to adapt very rapidly to changing conditions are studied and compared.By Lajos Hanzo, Fellow IEEE, and Byoung-Jo Choi

Cited by 15 publications

References 184 publications

Investigation of LTE Receivers in Term of Channel Equalization Techniques in LTE Downlink

Investigation of LTE Receivers in Term of Channel Equalization Techniques in LTE Downlink

Blind ICA detection based on second-order cone programming for MC-CDMA systems

Evolution of Diversity Gain with and without Coding Gain in MIMO for Emerging Wireless Networks

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