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Imperfect channel state information in MIMO-transmission
2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514), 2005A specially favorable MIMO-based concept for future mobile radio systems consists in the application of joint detection (JD) in the uplink and joint transmission (JT) in the downlink. By this, all the computationally complex signal processing is shifted to the base station (BS), resulting in low complexity mobile stations (MS).
T. Weber, M. Meurer
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Capacity bounds for MIMO multiple access channel with imperfect channel state information
2008 IEEE Information Theory Workshop, 2008This paper investigates the effect of channel estimation errors in presence of spatial correlation for fading MIMO multiple access channels (MACs). Specifically, the capacity is derived under the notion of reliable communication based on the average of the error probability over all channel estimation errors.
Layec, Patricia +3 more
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Performance of MIMO precoding systems with imperfect channel state information
Proceedings of the 3rd international conference on Mobile technology, applications & systems - Mobility '06, 2006Transmit precoding employing channel state information (CSI) at transmitter side can further improve capacity in multiple-input and multiple-output (MIMO) fading channel, but performance improvement largely depends on degree of channel knowledge. This paper considers imperfect CSI which results from channel estimation error at receiver side, CSI ...
Zhiqiang He, Yunhui Liu, Xiaolin Zhang
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Sensitivity of nonlinear precoding to imperfect channel state information in G.fast
2016 24th European Signal Processing Conference (EUSIPCO), 2016Nonlinear Tomlinson-Harashima precoding has been proposed as a near-optimal interference mitigation technique for downstream transmission in G.fast systems, particularly in the transmit spectrum above 106 MHz. We propose an alternative implementation of Tomlinson-Harashima precoding and examine performance of the common and alternative implementations ...
Jochen Maes +2 more
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Power Allocation in PDMA Systems with Imperfect Channel State Information
2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall), 2019Pattern division multiple access (PDMA) is a multi- carrier non-orthogonal multiple access (NOMA), which can meet the requirements of massive user connections and super-high data rate in the fifth generation (5G) wireless networks. In this paper, we work on the optimization of power allocation to improve the performance in the down-link PDMA system ...
Mingyao Peng +3 more
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Improved time synchronization in presence of imperfect channel state information
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013This paper addresses the time synchronization problem in IEEE 802.11a OFDM wireless systems. To enhance the coarse time synchronization mechanism, recent methods exploit not only traditional training sequences as specified by the standard but also additional knowledge available when the Carrier Sense Multiple Access with Collision Avoidance mechanism ...
Cong Luong Nguyen 0001 +3 more
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Goodput-Optimal Rate Adaptation with Imperfect Channel State Information
2009 IEEE 70th Vehicular Technology Conference Fall, 2009A rate adaptation scheme requires channel state information (CSI), which can be acquired at the receiver by inserting pilot symbols in the transmit signals. We have de- veloped a rate adaptation scheme that takes account of both channel estimation and prediction errors.
Le Cao, Pooi Yuen Kam
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Physical layer abstraction model with Imperfect Channel State Information
2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2019This paper analyzes the impact of the imperfect Channel State Information (CSI) on the Gaussian input mutual information between the channel input and output. The existing bounds of the mutual information under imperfect CSI depend on the estimated channel realization, while for physical layer abstraction, the goal is to provide such bounds as a ...
Viet-Hoa Nguyen +2 more
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2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733), 2004
We consider the problem of buffer and channel adaptive transmission over fading channels. In the model, data packets arrive stochastically into a finite-length buffer which transmits them over a time-varying correlated fading channel. We assume that knowledge of the buffer occupancy and the fading state is available at the transmitter. The objective is
Anh Tuan Hoang, Mehul Motani
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We consider the problem of buffer and channel adaptive transmission over fading channels. In the model, data packets arrive stochastically into a finite-length buffer which transmits them over a time-varying correlated fading channel. We assume that knowledge of the buffer occupancy and the fading state is available at the transmitter. The objective is
Anh Tuan Hoang, Mehul Motani
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Robust transmit eigen-beamforming based on imperfect channel state information
ITG Workshop on Smart Antennas (IEEE Cat. No.04EX802), 2005Transmit beamforming is a powerful technique for enhancing the performance and increasing the throughput of wireless communication systems that employ multiple antennas at the transmitter. A major drawback of most existing transmit beamforming techniques is that they require nearly perfect knowledge of the channel at the transmitter, which is typically
Ayman Abdel-Samad +2 more
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