Results 41 to 50 of about 157 (142)

Capacity-Approaching Non-Binary Turbo Codes: A Hybrid Design Based on EXIT Charts and Union Bounds

open access: yesIEEE Access, 2018
In this paper, we introduce a novel design approach for capacity-approaching non-binary turbo codes. There are two important factors that impact the performance of turbo codes in general: 1) the convergence behavior of iterative decoding in the low ...
Toshiki Matsumine, Hideki Ochiai
doaj   +1 more source

Joint Multilevel Turbo Equalization and Continuous Phase Frequency Shift Keying

open access: yesEURASIP Journal on Wireless Communications and Networking, 2008
A novel type of turbo coded modulation scheme, called multilevel turbo coded-continuous phase frequency shift keying (MLTC-CPFSK), is designed to improve the overall bit error rate (BER) and bandwidth efficiency. Then, this scheme is combined with a new
Odabasioglu Niyazi   +5 more
doaj  

Codebook-Based Trellis-Coded Quantization Scheme Using K-Means Clustering for Massive MIMO Systems

open access: yesIEEE Access
This paper introduces a codebook-based trellis-coded quantization (TCQ) approach utilizing K-means clustering, designed specifically for massive multiple-input multiple-output systems.
Sungsoo Park, Gyuyeol Kong
doaj   +1 more source

Five Decades of Hierarchical Modulation and Its Benefits in Relay-Aided Networking

open access: yesIEEE Access, 2015
Hierarchical modulation (HM), which is also known as layered modulation, has been widely adopted across the telecommunication industry. Its strict backward compatibility with single-layer modems and its low complexity facilitate the seamless upgrading of
Hua Sun   +3 more
doaj   +1 more source

Upper Bounds on the BER Performance of MTCM-STBC Schemes over Shadowed Rician Fading Channels

open access: yesEURASIP Journal on Advances in Signal Processing, 2004
Space-time block coding (STBC) provides substantial diversity advantages with a low decoding complexity. However, these codes are not designed to achieve coding gains. Outer codes should be concatenated with STBC to provide additional coding gain.
M. Uysal, C. N. Georghiades
doaj   +1 more source

Design of Efficient LDPC Coded Non-Recursive CPE-Based GMSK System for Space Communications

open access: yesIEEE Access, 2019
We consider a low-density parity-check (LDPC) coded non-recursive Gaussian minimum shift keying (GMSK) scheme for space communications subject to low signal-to-noise ratio (SNR), limited power, and spectrum resources.
Hai Zhu   +4 more
doaj   +1 more source

Performance Evaluation of Parallel Concatenated Chaos Coded Modulations

open access: yesJournal of Communications Software and Systems, 2008
In this article we study the performance of a class of parallel concatenated encoders similar to a turbo trellis coded modulation, but where the constituent encoders are chaos coded modulators.
Francisco J. Escribano   +2 more
doaj  

Network Coded Modulation for Two Way Relay Networks

open access: yesIraqi Journal for Computers and Informatics, 2014
Modern wireless networks use cooperative relaying to expand its coverage area. Wireless relaying allows mobile terminals to participate in transmission even when these terminals are not being the initial source or final destination.
Abdulkareem Kadhim, Karrar Ali
doaj   +1 more source

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