Results 191 to 200 of about 11,848 (246)

GABA, Glx, and GSH in the cerebellum: their role in motor performance and learning across age groups. [PDF]

Front Aging Neurosci
Van Malderen S, Hehl M, Verstraelen S, Breugelmans R, Oeltzschner G, Swinnen SP, Cuypers K.   +6 more
europepmc   +1 more source

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Turbo Coded Modulation for Unequal Error Protection

IEEE Transactions on Communications, 2008
A major concern in designing communication systems is to maintain quality of service for a wide range of channel conditions. This is an important issue particularly for the applications where precise characterization of the channel is impossible. For such applications, the source data can be classified into several classes and Unequal Error Protection (
Masoud Salehi
exaly   +2 more sources

Performance bounds for turbo-coded modulation systems

IEEE Transactions on Communications, 1999
We apply the standard union bound to turbo-coded modulation systems with maximum-likelihood decoding. To illustrate the methodology, we explicitly derive the bounds for the 2-bits/s/Hz 16 QAM system. Generalization of this bound to other turbo-coded modulation systems is straightforward.
Tolga M Duman
exaly   +2 more sources

Scrambling-Based Shaping for Turbo Coded Modulation

IEEE Transactions on Communications, 2010
We propose a multiple-candidate shaping technique for turbo coded modulation systems. Shaping gains are obtained by encoding each message into multiple turbo coded modulation sequences, called candidates, and then selecting the candidate with the lowest energy for transmission. Multiple candidates are generated by adding various scrambling sequences to
Yung-Chih Tsai, Mao-Chao Lin
exaly   +2 more sources

EXIT Charts for Turbo Trellis-Coded Modulation

IEEE Communications Letters, 2004
In this letter, we extend the previously proposed extrinsic information transfer charts (EXIT) method to the analysis of the convergence of turbo codes to turbo trellis-coded modulation (TTCM) schemes. The effectiveness of the proposed method is demonstrated through examples.
Hangjun Chen, A Haimovich
exaly   +2 more sources

Turbo coding applied to pragmatic trellis-coded modulation

IEEE Communications Letters, 2000
This letter reports the application of the powerful turbo coding technique combined with the bandwidth efficient method known as trellis-coded modulation (TCM). Implemented as a simple modification of pragmatic TCM, our turbo-coded pragmatic TCM system achieved coding gains of 1-2 dB in simulations relative to pragmatic TCM.
Bruce E. Wahlen, Calvin Y. Mai
openaire   +1 more source