Results 181 to 190 of about 5,976 (210)

On trellis modules for convolutional codes

Proceedings IEEE International Symposium on Information Theory,, 2003
We consider trellis modules for convo- lutional codes based on time-varying codes. I. EXTENDED SUMMARY Let C denote a convolutional code over GF(2), with block length n, k information bits and overall memory U (where v is the smallest integer such that C has an encoder requiring only U delay units), and free distance d.
R.D. Souza, B.F. Uchoa-Filho
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Turbo trellis-coded spatial modulation

2012 IEEE Global Communications Conference (GLOBECOM), 2012
In this paper, a turbo trellis-coded spatial modulation (TTCSM) transmission scheme is proposed. In trellis-coded spatial modulation (TCSM) scheme, the information bits used to select the transmit antenna index are encoded. In order to increase the performances of the TCSM scheme, a parallel concatenated encoding scheme can be used. Therefore, the TCSM
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Combination of block-coded modulation and trellis-coded modulation

IEE Proceedings I Communications, Speech and Vision, 1991
It is known that trellis-coded modulation (TCM) can give a significant coding gain without compromising bandwidth efficiency, by the concepts of signal set partition and trellis coding scheme. It is also known that block-coded modulation (BCM) can be used to approach closely the maximum energy saving that can be obtained by using the densest lattice ...
J.-M. Wu, S.-L. Su
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Phase ambiguity resolution in trellis-coded modulations

IEEE Transactions on Communications, 1990
A rotation detection algorithm for solving the phase ambiguity problem in trellis-coded modulations is proposed. This algorithm is simple to implement and may be an efficient alternative to rotationally invariant codes. Its performance has been investigated by simulation and appears promising. >
U. Mengali, A. Sandri, SPALVIERI, ARNALDO   +2 more
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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
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Dirty paper coding using trellis-coded modulation

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
Although the information theoretic result referred to as “dirty paper coding” [1] has been known for quite a while, it has not led to schemes that look attractive enough for real-life communication systems. In a companion paper [2], we presented the concept of sum codes and showed how they provide a convenient platform for interference suppression via ...
Kiran M. Rege, Krishna Balachandran, Joseph H. Kang, Mehmet Kemal Karakayali   +3 more
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The performance of trellis-coded modulation

TENCON'92 - Technology Enabling Tomorrow, 2003
Trellis-coded modulation (TCM) in an 8-PSK (phase shift keying) scheme is more power efficient than uncoded QPSK at the same spectral efficiency on perfect coherent detection. For the same signal-to-noise ratio (SNR) of phase reference, the sensitivity to phase offset for 8-PSK is more serious than for uncoded QPSK.
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Power Allocation in Concatenated Trellis Coded Modulation

IEEE Transactions on Wireless Communications, 2008
In this paper, power loading algorithms are presented for limited diversity fading channels with channel state information at the transmitter. Limited diversity channels are those that offer moderate levels of diversity (about 3-5) such as those encountered in orthogonal frequency division multiplexing (OFDM) based indoor wireless networks.
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A comparison of trellis modules for binary convolutional codes

IEEE Transactions on Communications, 1998
Summary: A convolutional code can be represented by the conventional trellis module or the ``minimal'' trellis module based on the BCJR trellis for block codes. For many convolution codes the trellis complexity (TC) of the minimal module is significantly less than the TC of the conventional module.
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Decoding algorithms for noncoherent trellis coded modulation

IEEE Transactions on Communications, 1996
Noncoherent decoding of trellis codes using multiple-symbol overlapped observations was shown previously to achieve close to the coherent performance. Optimal decoding by the Viterbi algorithm for L-symbol observations requires a number of states which grows exponentially with L.
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