Results 171 to 180 of about 1,776 (214)
Some of the next articles are maybe not open access.
Improved codes for space-time trellis-coded modulation
IEEE Communications Letters, 2000Space-time coded modulation has been shown to efficiently use transmit diversity to increase spectral efficiency. We propose new trellis codes found through systematic code search. These codes achieve the theoretically maximal diversity gain and improved coding gain compared to known codes.
G Bauch
exaly +2 more sources
Noncoherent-coded modulation constructed from conventional trellis-coded modulation
IEEE Communications Letters, 1998We propose a method to construct noncoherent-coded modulation (NCM) by modifying the conventional trellis-coded modulation (TCM) as proposed by Ungerboeck (1982). The error performance of the modified TCM using noncoherent decoding can approach that of the conventional TCM using coherent decoding for additive white Gaussian noise.
Ruey-Yi Wei, Mao-Chao Lin
exaly +2 more sources
On punctured trellis-coded modulation
IEEE Transactions on Information Theory, 1996Summary: Punctured convolutional codes result in some savings in the complexity of Viterbi decoders, compared to other codes of the same rate. However, in general use of the punctured structure in the decoder results in a performance loss for trellis codes, due to difficulties in assigning metrics.
Jaehyeong Kim, Gregory J. Pottie
openaire +1 more source
Systematic trellis-coded modulation
Proceedings of IEEE Vehicular Technology Conference (VTC), 2002Systematic trellis-coded modulation (STCM) is a novel approach to coded modulation, which enables symbol-by-symbol detection of trellis-coded data. A set of design rules, which guarantees nonzero coding gain, and codes with asymptotic coding gains of 3.0-5.4 dB are presented. STCM is well suited for operation in a dual-mode receiver.
Ettie Katz, Gordon L. Stüber
openaire +1 more source
Trellis Coding with Asymmetric Modulations
IEEE Transactions on Communications, 1987Traditionally symmetric signal constellations, i.e., those with uniformly spaced signal points, have been used for both uncoded and coded systems. Although symmetric signal constellations are optimum with no coding, the same is not necessarily true for coded systems. This paper shows that by designing the signal constellations to be asymmetric, one can,
Dariush Divsalar +2 more
openaire +1 more source
Cooperative Multiple Trellis Coded Modulation
MILCOM 2006, 2006In this paper, we consider the design of cooperative multiple trellis coded modulation (CMTCM) schemes over Rayleigh fading channels. We design cooperative multiple trellis codes using asymmetric constellations that provide significant gains over non-cooperative coded modulation without sacrificing the data rate and bandwidth consumption.
Jialing Li, Andrej Stefanov
openaire +1 more source
Trellis Code Design for Spatial Modulation
2011 IEEE International Conference on Communications (ICC), 2011In this paper, we propose a novel MIMO transmission scheme, called trellis coded spatial modulation (TC-SM) in which the trellis (convolutional) encoder and the spatial modulation (SM) mapper are jointly designed similar to the conventional trellis coded modulation (TCM).
Basar, Ertugrul +3 more
openaire +3 more sources
A Pragmatic Approach to Trellis-Coded Modulation
IEEE Communications Magazine, 1989Since the early 1970s, for power-limited applications, the convolutional code constraint length K=7 and rate 1/2, optimum in the sense of maximum free distance and minimum number of bit errors caused by remerging paths at the free distance, has become the de facto standard for coded digital communication.
Andrew J. Viterbi +3 more
openaire +1 more source
1999
As it is discussed in Chapter 1, power and bandwidth are limited resources in modern communication systems, and the efficient exploitation of these resources invariably involves an increase in complexity. It has become apparent over the past few decades that when there are strict limits on the power and bandwidth resources, the complexity of ...
Irving S. Reed, Xuemin Chen
openaire +1 more source
As it is discussed in Chapter 1, power and bandwidth are limited resources in modern communication systems, and the efficient exploitation of these resources invariably involves an increase in complexity. It has become apparent over the past few decades that when there are strict limits on the power and bandwidth resources, the complexity of ...
Irving S. Reed, Xuemin Chen
openaire +1 more source
A trellis-coded chaotic modulation scheme
2006 IEEE International Conference on Communications, 2006Recently, a chaotic modulation has been proposed and attracts many researchers' attention because of some properties such as noise-like signal, nonlinearity, and pseudo-periodicity. The chaotic modulation is usually treated as a secure transmission scheme rather than an efficient scheme in terms of channel noise.
Eiji Okamoto, Yasunori Iwanami
openaire +1 more source