Browsing by Subject "OFDM"
Now showing items 1-19 of 19
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A new WDM Application Response Time in WLAN Network and Fixed WiMAX using Distributed
( IEEE , 2014 , Conference Paper)Worldwide Interoperability for Microwave Access (WiMAX) and Wireless LAN (WLAN) has emerged as a promising solution for last mile access technology to provide high speed internet access in the residential as well as small ... -
A new WDM Application Response Time in WLAN Network and Fixed WiMAX using Distributed
( IEEE Computer Society , 2014 , Conference Paper)Worldwide Interoperability for Microwave Access (WiMAX) and Wireless LAN (WLAN) has emerged as a promising solution for last mile access technology to provide high speed internet access in the residential as well as small ... -
A Novel OFDM Waveform with Enhanced Physical Layer Security
( IEEE , 2021 , Article)This letter proposes a secure orthogonal frequency division multiplexing (OFDM) waveform based on two physical-layer secrecy enhancing methods. The first method is time-domain pre-coding that involves interleaving and ... -
A regularization approach to MSE analysis of OFDM under phase noise
( Elsevier , 2018 , Article)Orthogonal frequency division multiplexing (OFDM) is widely used in broadband wireless communications systems because of its high resilience to frequency-selective fading and its low implementation complexity. Phase noise ... -
A USRP-based experimental testbed for OFDM systems impaired by I/Q imbalance
( IEEE , 2013 , Conference Paper)In this paper, an experimental testbed for packet based OFDM systems is proposed using USRP RF front-ends. I/Q imbalance estimation and compensation algorithms are implemented at the receiver by manually injecting I/Q ... -
An efficient reduced complexity PAPR reduction approach for 3GPP LTE system
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In wideband communication systems, Multi-Input Multi-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) has been proposed as an efficient technique to enhance the link reliability and the spectral efficiency. ... -
Digital baseband compensation of frequency-dependent joint TX/RX I/Q imbalance in beamforming MIMO OFDM transceivers
( IEEE , 2012 , Conference Paper)In this paper, we investigate the effects of asymmetric frequency-dependent joint transmit-receive I/Q imbalance on the performance of beamforming MIMO-OFDM systems. We derive the throughput-maximizing transmit/receive ... -
Enhanced Alamouti decoding scheme for DVB-T2 systems in SFN channels
( IEEE , 2011 , Conference Paper)The standard Alamouti space-frequency block code (SFBC) suffers from performance degradation when used over highly frequency-selective channels because the channel frequency response is not necessarily flat over the Alamouti ... -
I/Q imbalance in multiple beamforming {OFDM} transceivers: SINR analysis and digital baseband compensation
( IEEE , 2013 , Article)In this paper, we start by investigating the impact of joint transmit-receive I/Q imbalance on the performance of direct-conversion beamforming OFDM transceivers. We derive a new analytical expression for the average ... -
Impact of the Wireless Network's PHY Security and Reliability on Demand-Side Management Cost in the Smart Grid
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)We investigate the impact of the wireless network's physical layer (PHY) security and reliability on demand-side management operation in the smart grid. We assume that consumers communicate their energy demands with the ... -
Maximum likelihood detection of precoded SFBC in frequency-selective fading channels
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Conference Paper)In this paper, we derive the maximum likeli-hood detector (MLD) for precoded space-frequency block coded (SFBC) systems where orthogonal frequency divi-sion multiplexing (OFDM) is incorporated. The obtained results reveal ... -
Modulation-independent non-data-aided SNR estimator for OFDM signals in nakagami fading channels
(2013 , Conference Paper)A signal-to-noise ratio estimator for OFDM signals in Nakagami-m fading channels is proposed. This estimator can be used with any signal constellation. It is an envelope-based non-data-aided estimator that makes use of ... -
On the Achievable Rates of OFDM with Common Phase Error Compensation in Phase Noise Channels
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)This paper considers the problem of analytically assessing the maximum achievable rates (capacity) of orthogonal frequency division multiplexing (OFDM) transmissions when the receiver, for complexity reasons, only accounts ... -
Reduced-complexity sparsity-aware joint phase noise mitigation and channel equalization in OFDM receivers
( Elsevier B.V. , 2018 , Article)A major performance and complexity limitation in direct-conversion broadband wireless transceivers is the phase noise (PN) resulting from the inevitable imperfections in the fabrication process of the crystal oscillator. ... -
Secondary users selection and sparse narrow-band interference mitigation in cognitive radio networks
( Elsevier B.V. , 2018 , Article)Spectrum scarcity is a critical problem that may reduce the effectiveness of wireless technologies and services. To address this problem, different spectrum management techniques have been proposed in the literature such ... -
Secure multiple-mode OFDM with index modulation
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Multiple-mode orthogonal frequency division multiplexing with index modulation (MM-OFDM-IM) is a promising IM technique for OFDM systems to improve the spectral efficiency. In this paper, a secure index and data symbol ... -
Self-interference cancellation using time-domain phase noise estimation in OFDM full-duplex systems
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Conference Paper)In full-duplex systems, the local oscillator phase noise (PN) problem is one of the bottleneck challenges that may face the self-interference cancellation (SIC) stage especially when orthogonal frequency division multiplexing ... -
SINR analysis for beamforming OFDM systems under joint transmit-receive I/Q imbalance
( IEEE , 2012 , Conference Paper)In this paper, we derive an analytical expression for the subcarrier average SINR of a beamforming OFDM system in the presence of joint transmit-receive I/Q imbalance. The derived expression quantifies the impact of the ... -
Sparse Equalizers for OFDM Signals with Insufficient Cyclic Prefix
( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)The cyclic prefix (CP) is appended in orthogonal frequency division multiplexing (OFDM) signals to combat inter-symbol interference (ISI) and inter-carrier interference (ICI) induced by the communication channel, which ...