Results 121 to 130 of about 4,021,406 (264)

Decision Directed Channel Estimation Aided OFDM Employing Sample-Spaced and Fractionally-Spaced CIR Estimators

, 2007
In this letter we characterize the substantial difference between two channel estimation approaches, namely the sample-spaced (SS) and the fractionally-spaced (FS) channel impulse response (CIR) estimators. The achievable performance of decision-directed
Akhtman, Jos, Hanzo, Lajos
core  

Enhancing Data Transmission Security and Reliability of OFDM-IM for 5G Wireless Communication Systems

Journal of Telecommunications and Information Technology
Thanks to its improved spectral efficiency and immunity to frequency selective fading, OFDM with index modulation (OFDM-IM) has become a perspective option.
Asaad H. Sahar, Aqiel N. Almamori, Muhannad Y. Muhsin   +2 more
doaj   +1 more source

MMSE Channel Prediction for Symbol-by-Symbol Adaptive OFDM Systems

, 2000
Subband Adaptive Orthogonal Frequency Division Multiplexing (OFDM) constitutes an effective method of compensating for the frequency selective fading incurred by mobile receivers.
Münster, M., Hanzo, L.
core  

Parallel-Interference-Cancellation-Assisted Decision-Directed Channel Estimation for OFDM Systems using Multiple Transmit Antennas

, 2005
The number of transmit antennas that can be employed in the context of least-squares (LS) channel estimation contrived for orthogonal frequency division multiplexing (OFDM) systems employing multiple transmit antennas is limited by the ratio of the ...
M. Munster, Munster, M., L. Hanzo, Hanzo, L.   +3 more
core   +1 more source

Performance of SDMA Multi-User Detection Techniques for Walsh-Hadamard-Spread OFDM Schemes

, 2001
Multiple reception antenna assisted Space Division Multiple Access (SDMA) techniques designed for wireless OFDM systems have recently drawn wide interests. These techniques facilitate the implementation of effective multi-user detection algorithms at the
Münster, M., Hanzo, L.
core  

Adaptive Modulation Techniques for Duplex OFDM Transmission

, 2000
The design tradeoffs of turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (OFDM) wide-band transceivers are analyzed. We demonstrate that upon aiming for a higher throughput a higher proportion of low-quality OFDM subcarriers ...
Keller, T., Hanzo, L.
core  

Federated K-Means Clustering for Adaptive OFDM-IM

IEEE Communications Letters, 2023
Xueyu Wu 0002, Andy M. Tyrrell, Youngwook Ko   +2 more
openaire   +2 more sources

Generic Reduced-Complexity MMSE Channel Estimation for OFDM and MC-CDMA

, 2005
The performance of a decision-directed channel estimation scheme is analyzed in the context of both OFDM and MC-CDMA systems. A difficulty associated with the employment of the Least Squares (LS) approach to the problem of a posteriori channel estimation
Akhtman, J., Hanzo, L.
core  

MIMO-OFDM with insufficient cyclic prefix

, 2019
For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response, resulting in a loss of bandwidth efficiency. In this letter, the CP reconstruction (CPR) technique is first applied to
Choi, CH, Lim, JB, Im, GH
core   +1 more source

OFDM synchronizer implementation for an IEEE 802.11(a) compliant modem

, 2002
In OFDM transmissions, synchronization arises to be one of the most critical operations. The reason for that is the preservation of orthogonality: timing offsets and frequency offsets destroy easily this orthogonality, leading to Inter-Symbol ...
Troya, Alfonso, Kraemer, Rolf, Maharatna, Koushik, Krstic, Milos, Grass, Eckhard   +4 more
core