Browsing by Keywords "Orthogonal frequency division multiplexing"
Now showing items 1-16 of 16
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Adaptive OFDM modulation for underwater acoustic communications: Design considerations and experimental results
(Institute of Electrical and Electronics Engineers Inc., 2014)In this paper, we explore design aspects of adaptive modulation based on orthogonal frequency-division multiplexing (OFDM) for underwater acoustic (UWA) communications, and study its performance using real-time at-sea ... -
An asynchronous two-way relay system with full delay diversity in time-varying multipath environments
(Institute of Electrical and Electronics Engineers Inc., 2015)We consider design of asynchronous OFDM-based diamond two-way-relay (DTWR) systems in time-varying frequency-selective (doubly-selective) fading channels such as underwater acoustic (UWA) channels. In a DTWR channel, two ... -
Blind phase noise estimation in OFDM systems by sequential Monte Carlo method
(2006)In this paper, based on a sequential Monte Carlo method, a computationally efficient algorithm is presented for estimating the residual phase noise, blindly, generated at the output the phase tracking loop employed in OFDM ... -
Capacity analysis of a PMR system with DAB downlink
(2003)Several trunked private mobile radio (PMR) systems have been designed over the last decade, most of which have symmetric downlink and uplink channel capacities. These systems may not be spectrally efficient in case of group ... -
Channel estimation for MIMO-OFDM in fixed broadband wireless applications
(2006)Systems employing multiple transmit and receive antennas, known as multiple input multiple output (MIMO) systems can be used with OFDM to improve the resistance to channel impairments. Thus the technologies of OFDM and ... -
Connectivity analysis of an AUV network with OFDM based communications
(Institute of Electrical and Electronics Engineers Inc., 2017)Autonomous underwater vehicle (AUV) networks play a crucial role in tactical, commercial, and scientific applications, where reliable and robust communication protocols are needed due to the challenging characteristics of ... -
A delay-tolerant asynchronous two-way-relay system over doubly-selective fading channels
(Institute of Electrical and Electronics Engineers Inc., 2015)We consider design of asynchronous orthogonal frequency division multiplexing (OFDM) based diamond two-way-relay (DTWR) systems in a time-varying frequency-selective (doubly-selective) fading channel. In a DTWR system, two ... -
Differential modulation for asynchronous two-way relay systems over frequency-selective fading channels
(John Wiley and Sons Ltd, 2016)We propose two schemes for asynchronous multi-relay two-way relay (MR-TWR) systems in which neither the users nor the relays know the channel state information. In an MR-TWR system, two users exchange their messages with ... -
An efficient parallelization technique for high throughput FFT-ASIPs
(2006)Fast Fourier Transformation (FFT) and it's inverse (IFFT) are used in Orthogonal Frequency Division Multiplexing (OFDM) systems for data (de)modulation. The transformations are the kernel tasks in an OFDM implementation, ... -
EM based MAP channel estimation for turbo/convolutional coded SFBC/STBC-OFDM systems
(2006)We consider the design of turbo receiver structures for space-frequency block coded (SFBC/STBC) OFDM systems in unknown frequency selective fading channels. The Turbo receiver structures for SFBC/STBC-OFDM systems under ... -
A low-complexity time-domain MMSE channel estimator for space-time/frequency block-coded OFDM systems
(Hindawi Publishing Corporation, 2006)Focusing on transmit diversity orthogonal frequency-division multiplexing (OFDM) transmission through frequency-selective channels, this paper pursues a channel estimation approach in time domain for both space-frequency ... -
Multi-resampling Doppler compensation in cooperative underwater OFDM systems
(2013)We consider a multi-carrier cooperative underwater acoustic communication (UWAC) system and investigate the Doppler scaling problem arising due to the motion of different nodes. Specifically, we assume an orthogonal frequency ... -
Multiple-resampling receiver design for OFDM over Doppler-distorted underwater acoustic channels
(2013)In this paper, we focus on orthogonal frequency-division multiplexing (OFDM) receiver designs for underwater acoustic (UWA) channels with user-and/or path-specific Doppler scaling distortions. The scenario is motivated by ... -
Nondata-aided channel estimation for OFDM systems with space-frequency transmit diversity
(Institute of Electrical and Electronics Engineers, 2006)This paper proposes a computationally efficient nondata-aided maximum a posteriori (MAP) channel-estimation algorithm focusing on the space-frequency (SF) transmit diversity orthogonal frequency division multiplexing (OFDM) ... -
Performance limits on ranging with cognitive radio
(2009)Cognitive radio is a promising paradigm for efficient utilization of the radio spectrum due to its capability to sense environmental conditions and adapt its communication and localization features. In this paper, the ... -
Performance of edge windowing for OFDM under non-linear power amplifier effects
(Institute of Electrical and Electronics Engineers Inc., 2017)Edge windowing is a windowing technique for Orthogonal Frequency Division Multiplexing (OFDM) signals based on the idea of using shorter cyclic prefix (CP) and longer window lengths at the edge subcarriers while keeping ...
