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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Channel, Phase Noise, And Frequency Offset In Ofdm Systems: Joint Estimation, Data Detection, And Hybrid Cramér-Rao Lower Bound, Omar Hazim Salim, Ali A. Nasir, Hani Mehrpouyan, Wei Xiang, Salman Durrani, Rodney A. Kennedy
Channel, Phase Noise, And Frequency Offset In Ofdm Systems: Joint Estimation, Data Detection, And Hybrid Cramér-Rao Lower Bound, Omar Hazim Salim, Ali A. Nasir, Hani Mehrpouyan, Wei Xiang, Salman Durrani, Rodney A. Kennedy
Hani Mehrpouyan
Oscillator phase noise (PHN) and carrier frequency offset (CFO) can adversely impact the performance of orthogonal frequency division multiplexing (OFDM) systems, since they can result in inter carrier interference and rotation of the signal constellation. In this paper, we propose an expectation conditional maximization (ECM) based algorithm for joint estimation of channel, PHN, and CFO in OFDM systems. We present the signal model for the estimation problem and derive the hybrid Cramér-Rao lower bound (HCRB) for the joint estimation problem. Next, we propose an iterative receiver based on an extended Kalman filter for joint data detection and PHN tracking. Numerical …
Joint Phase Noise Estimation And Data Detection In Coded Mimo Systems, Arif O. Isikman, Hani Mehrpouyan, Ali A. Nasir, Alexander G. Amat, Rodney A. Kennedy
Joint Phase Noise Estimation And Data Detection In Coded Mimo Systems, Arif O. Isikman, Hani Mehrpouyan, Ali A. Nasir, Alexander G. Amat, Rodney A. Kennedy
Hani Mehrpouyan
In this paper, the problem of joint oscillator phase noise (PHN) estimation and data detection for multi-input multi-output (MIMO) systems using bit-interleaved coded modulation (BICM) is analyzed. A new MIMO receiver that iterates between the estimator and the detector, based on the expectation-maximization (EM) framework, is proposed. It is shown that at high signal-to-noise ratios, a maximum a posteriori estimator (MAP) can be used to carry out the maximization step of the EM algorithm. Moreover, to reduce the computational complexity of the proposed EM algorithm, a soft decision-directed extended Kalman filter-smoother (EKFS) is applied instead of the MAP estimator to …
Improving Bandwidth Efficiency In E-Band Communication Systems, Hani Mehrpouyan, M. Reza Khanzadi, Michail Matthaiou, Akbar M. Sayeed, Robert Schober, Yingbo Hua
Improving Bandwidth Efficiency In E-Band Communication Systems, Hani Mehrpouyan, M. Reza Khanzadi, Michail Matthaiou, Akbar M. Sayeed, Robert Schober, Yingbo Hua
Hani Mehrpouyan
The allocation of a large amount of bandwidth by regulating bodies in the 70/80 GHz band, that is, the E-band, has opened up new potentials and challenges for providing affordable and reliable gigabit-per-second wireless point-to-point links. This article first reviews the available bandwidth and licensing regulations in the E-band. Subsequently, different propagation models (e.g., the ITU-R and Cane models) are compared against measurement results, and it is concluded that to meet specific availability requirements, E-band wireless systems may need to be designed with larger fade margins compared to microwave systems. A similar comparison is carried out between measurements …
Channel Estimation And Carrier Recovery In The Presence Of Phase Noise In Ofdm Relay Systems, Rui Wang, Hani Mehrpouyan, Meixia Tao, Yingbo Hua
Channel Estimation And Carrier Recovery In The Presence Of Phase Noise In Ofdm Relay Systems, Rui Wang, Hani Mehrpouyan, Meixia Tao, Yingbo Hua
Hani Mehrpouyan
In this paper, we analyze joint channel, carrier frequency offset (CFO), and phase noise estimation in orthogonal frequency division multiplexing (OFDM) relaying networks. To achieve this goal, a detailed transmission framework involving both training and data symbols is first presented. Next, a novel algorithm that applies the training symbols to jointly estimate the channel responses, CFO, and phase noise parameters based on the maximum a posteriori criterion is proposed. Additionally, to evaluate the performance of the proposed channel estimation and carrier recovery algorithms, we analyze the ambiguities among the estimated parameters. Based on this analysis, a new Hybrid Cramér-Rao Lower …
Enhanced List-Based Group-Wise Overloaded Receiver With Application To Satellite Reception, Zohair Abu-Shaban, Bhavani Shankar Mysore R., Hani Mehrpouyan, Björn Ottersten
Enhanced List-Based Group-Wise Overloaded Receiver With Application To Satellite Reception, Zohair Abu-Shaban, Bhavani Shankar Mysore R., Hani Mehrpouyan, Björn Ottersten
Hani Mehrpouyan
The market trends towards the use of smaller dish antennas for TV satellite receivers, as well as the growing density of broadcasting satellites in orbit require the application of robust adjacent satellite interference (ASI) cancellation algorithms at the receivers. The wider beamwidth of a small size dish and the growing number of satellites in orbit impose an overloaded scenario, i.e., a scenario where the number of transmitting satellites exceeds the number of receiving antennas. For such a scenario, we present a two stage receiver to enhance signal detection from the satellite of interest, i.e., the satellite that the dish is …