Results 211 to 220 of about 2,563 (249)

Evaluating the performance of turbo codes and turbo-coded modulation in a DS-CDMA environment

IEEE Journal on Selected Areas in Communications, 1999
Turbo codes have received great attention due to their outstanding performance. Unfortunately, a high performance is associated with large transmission delays, prohibiting an application for speech transmission. Hence, the aim of this paper is the comparison of turbo codes employing short interleavers with convolutional codes in terms of bit error rate
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QAM modulations withq-ary turbo codes

Science in China Series E: Technological Sciences, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhang, Yuwei, Wang, Xinmei
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Adaptive Modulation and Code Rate for Turbo Coded OFDM Transmissions

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007
This paper discusses the application of adaptive modulation and adaptive rate turbo-coding to OFDM (orthogonal frequency-division multiplexing), to enable a closer approach to the Shannon capacity of the time and frequency selective channel. The adaptive turbo-code scheme is based on a subband adaptive method, and compares two adaptation algorithms: a ...
Lei Ye 0001, Alister G. Burr
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Joint turbo coding and modulated coding for channel with intersymbol interference

IEEE Transactions on Consumer Electronics, 2000
Modulated codes as an effective technique to mitigate intersymbol interference (ISI) have been studied previously which can transfer the multipath interference into implicit diversity and provide a certain coding gain compared with the ideal additive white Gaussian noise (AWGN) channel.
Pingyi Fan, Xiang-Gen Xia 0001
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Performance analysis of bit-cooperative coded modulation with turbo codes

2013 IEEE Global Communications Conference (GLOBECOM), 2013
Bit-cooperative coded modulation (BCCM), known as an improved bit-interleaved coded modulation (BICM) scheme [1], introduces known bits to jointly design the channel coding and modulation. In this paper, we contribute to the theoretical analysis of the turbo-coded BCCM scheme, and specifically, the impact of the known bits on the turbo decoding process.
Ji Zhao 0009, Zhiyong Chen 0002, Bin Xia 0001, Manyuan Shen, Hui Liu 0011   +4 more
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Combined multilevel turbo-code with 8PSK modulation

Proceedings of GLOBECOM '95, 2002
Different concepts of iterative decoding algorithms for serial or parallel concatenated coding (called turbo-code) as well as for the special case of the generalized concatenated coding schemes have been introduced. These algorithms being very efficient, are based on soft output decoding, where, the soft decisions are used as feed-forward information ...
Fazel, K., Papke, L.
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Turbo coded continuous phase modulation

2001 MILCOM Proceedings Communications for Network-Centric Operations: Creating the Information Force (Cat. No.01CH37277), 2002
Continuous phase modulation (CPM) provides an attractive option for spectrally efficient communications systems. Turbo-coding combined with CPM has the potential to result in a spectrally efficient scheme that is also energy efficient in that it yields low error rates at low signal-to-noise ratios. In this paper we consider the concatenation of a turbo
A.Z. Yilmaz, W.E. Stark
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Carrier phase recovery for turbo-coded linear modulations

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003
In this paper, we present a low-complexity carrier phase estimation algorithm suited for turbo-coded 16-QAM modems. The estimator is based on a maximum likelihood (ML) approach, and unlike previously published work, makes iterative use of soft decisions provided by the soft-in soft-out decoders within the overall iterative turbo decoding scheme ...
LOTTICI, VINCENZO, LUISE, MARCO
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Hybrid ARQ for turbo coded modulation with mixed combining

2009 43rd Annual Conference on Information Sciences and Systems, 2009
In this paper, we consider the hybrid automatic retransmission request (ARQ) for turbo coded systems with QAM modulations through block fading channels and the rates are different among (re)transmission blocks. Due to coexistence of incremental redundancy (IR) and repetition, both Chase combining (CC) and IR code combining are employed at the receiver.
Guosen Yue, Xiaodong Wang 0001
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VLSI-implementation issues of turbo trellis-coded modulation

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2003
Turbo trellis-coded modulation (TTCM) is a very promising approach for future communication systems. It combines the advantages of channel coding with multilevel signals and the powerful turbo-codes concept. In this paper we consider VLSI implementation aspects of TTCM.
Frank Kienle, Gerd Kreiselmaier, Norbert Wehn   +2 more
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