Results 11 to 20 of about 159,611 (219)

Robust downlink beamforming with imperfect CSI

2013 IEEE International Conference on Communications (ICC), 2013
In this paper, we consider an optimum multicell downlink beamforming that minimizes a combination of the sum-power, used by each base station (BS) to transmit data to its local users, and the worst-case of the resulting overall interference induced on ...
Mati Tshangini, Nakhai, Mohammad Reza; id_orcid, Tshangini, Mati, Mohammad Reza Nakhai   +3 more
core   +3 more sources

Novel Robust Optimization and Power Allocation of Time Reversal-MIMO-UWB Systems in an Imperfect CSI

International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, 2013
Time Reversal (TR) technique is an attractive solution for a scenario where the transmission system employs low complexity receivers with multiple antennas at both transmitter and receiver sides.
Sajjad Alizadeh, Hossein Khaleghi Bizaki
doaj   +2 more sources

MU-MIMO precoding for VLC with imperfect CSI

2015 4th International Workshop on Optical Wireless Communications (IWOW), 2015
This paper investigates the performance of different precoding schemes for a multi-user MIMO VLC system with channel estimation errors, an assumption that is commonly neglected in the literature.
Karagiannidis, George K., Muhaidat, Sami, George K. Karagiannidis, Bayan Sharif, Sharif, Bayan, Vasileios M. Kapinas, Dawoud, Diana, Marshoud, Hanaa, Sami Muhaidat, Hanaa Marshoud, Diana Dawoud, Kapinas, Vasileios M.   +11 more
core   +2 more sources

CSI-Aware Adaptive PSO-Based Power Allocation for Enhancing SIC Reliability in Imperfect-CSI NOMA Systems

Journal of Electrical and Computer Engineering
Future wireless networks must accommodate massive connectivity under stringent spectral- and energy-efficiency requirements, thereby intensifying the demand for robust power-domain nonorthogonal multiple access (NOMA).
Fabian Chukwudi Ogenyi, Chinyere Nneoma Ugwu, Okechukwu Paul-Chima Ugwu, Michael Ben Okon, Jovita Nnenna Ugwu   +4 more
doaj   +2 more sources

Cross-layer design for single-cell OFDMA systems with heterogeneous QoS and partial CSIT [PDF]

, 2009
— This paper proposes a novel cross-layer scheduling scheme for a single-cell orthogonal frequency division multiple access (OFDMA) wireless system with partial channel state information (CSI) at transmitter (CSIT) and heterogeneous user delay ...
Charilaos Zarakovitis, Skordoulis, D., Zarakovitis, C., Qiang Ni, Zarakovitis, C, Ni, Q, Ni, Q., Dionysios Skordoulis, Skordoulis, D   +8 more
core   +7 more sources

Beamforming with Imperfect CSI [PDF]

2007 IEEE Wireless Communications and Networking Conference, 2007
With channel state information (CSI) at the transmitter, beamforming can be used for spatial diversity and multiple spatial access. Due to latency and feedback bandwidth limitation, the CSI at the transmitter is often known with some ambiguity. In this paper, we develop a robust method for downlink beamforming that takes the ambiguity of the CSI into ...
Geoffrey Ye Li, Anthony C. K. Soong, Yinggang Du, Jianmin Lu   +3 more
openaire   +1 more source

On Performance of Energy Harvested Cooperative NOMA Under Imperfect CSI and Imperfect SIC [PDF]

IEEE Transactions on Vehicular Technology, 2021
With the advent of 5G and the need for energy-efficient massively connected wireless networks, in this work, we consider an energy harvesting (EH) based multi-relay downlink cooperative non-orthogonal multiple access (NOMA) system with practical constraints. The base station serves NOMA users with the help of decode-and-forward based multiple EH relays,
Shubham Bisen, Parvez Shaik, Vimal Bhatia   +2 more
openaire   +3 more sources

On the throughput of opportunistic beamforming with imperfect CSI [PDF]

Proceedings of the 2007 international conference on Wireless communications and mobile computing, 2007
The throughput of a multiple-antenna broadcast channel highly depends on the channel state information (CSI) at the transmitter side. However, due to the time variant nature of wireless channels, having perfect knowledge of the underlying links appears to be a questionable assumption, especially when the number of users and/or antennas increases ...
Vakili, Ali, Dana, Amir F., Hassibi, Babak   +2 more
openaire   +3 more sources

On imperfect CSI for the downlink of a two-tier network [PDF]

2011 IEEE International Symposium on Information Theory Proceedings, 2011
In this paper, we consider a hierarchical two-tier cellular network where a macrocell is overlaid with a tier of randomly distributed femtocells. We evaluate the combined effect of uncoordinated cross-tier interference, feedback delay, and quantization errors on the achievable rate of transmit beamforming with imperfect channel state information (CSI).
Salam Akoum, Marios Kountouris, Robert W. Heath Jr.   +2 more
openaire   +2 more sources

Impacts of Imperfect Channel State Information, Transceiver Hardware, and Self-Interference Cancellation on the Performance of Full-Duplex MIMO Relay System

Sensors, 2020
Imperfect channel state information (I-CSI) and imperfect transceiver hardware often happen in wireless communication systems due to the time-varying and random characteristics of both wireless channels and hardware components.
Ba Cao Nguyen, Nguyen Nhu Thang, Xuan Nam Tran, Le The Dung   +3 more
doaj   +1 more source