Combined multilevel Turbo-code with MR-modulation

Papke, L.; Fazel, K.

doi:10.1109/icc.1995.524188

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Eventually, the equalized information sequences (d k ) are passed through the SISO decoders.In SISO decoders, the MAP algorithm calculates the a posteriori probability of each bit at each decoding process [15]. At the last iteration, hard decision is computed by using the second decoder output Λ (2) as follows:…”

Section: Turbo Equalization Receiver Schemementioning

confidence: 99%

“…First, conventional turbo code was found to be very attractive in the last decade [1], since turbo code reached theoretical limits in an iterative fashion at low signal-to-noise ratio with a cost of a low code rate and bandwidth expansion. Several years later, the compensation for bandwidth expansion and the low code rate was realized by applying multilevel and trellis-coded modulation to turbo code, known as multilevel turbo codes (MLTCs) [2,3] and turbo trellis-coded modulation (TTCM) [4,5], respectively, in the literature. These techniques increase the spectral efficiency of the coding via concatenating higher-order modulation using PSK or QAM modulations [6]; however, these communication models have phase jumps in their modulated signals.…”

Section: Introductionmentioning

confidence: 99%

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Joint Multilevel Turbo Equalization and Continuous Phase Frequency Shift Keying

Bayat

Odabasioglu

Osman

et al. 2009

J Wireless Com Network

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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 double decision feedback equalizer (DDFE) to remove the interference and to enhance BER performance for the intersymbol interference (ISI) channels. The entire communication scheme is called multilevel turbo equalization-continuous phase frequency shift keying (MLTEQ-CPFSK). In these schemes, parallel input data sequences are encoded using the multilevel scheme and mapped to CPFSK signals to obtain a powerful code with phase continuity over the air. The performances of both MLTC-CPFSK and MLTEQ-CPFSK systems were simulated over nonfrequency and frequency-selective channels, respectively. The superiority of the two level turbo codes with 4CPFSK modulation is shown against the trellis-coded 4CPFSK, multilevel convolutional coded 4CPFSK, and TTCM schemes. Finally, the bit error rate curve of MLTEQ-CPFSK system over Proakis B channel is depicted and ISI cancellation performance of DDFE equalizer is shown against linear and decision feedback equalizers

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Section: Turbo Equalization Receiver Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joint Multilevel Turbo Equalization and Continuous Phase Frequency Shift Keying

Bayat

Odabasioglu

Osman

et al. 2009

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

Bibliography

2011

Turbo Coding, Turbo Equalisation and Space–Time Coding

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Analysis of a Dual‐Rate Transmission Scheme for Gaussian Broadcast Channels

Sajadieh¹,

Kschischang

Leon-Garcia

2000

Trans Emerging Tel Tech

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Abstract. In a broadcast channel, a single transmitter communicates to receivers with different channel capacities, a typical example of which is the over-the-air television broadcasting. A natural question that arises is evaluation of the optimal information transfer rate in such an environment. For the two-receiver case, we examine various transmission scenarios in this environment and focus on the theoretically optimal superposition scheme, where the information intended for the better channel is superimposed on the portion of information common to both receivers. As a result, a basic grade of service is maintained throughout the entire coverage area in addition to a higher quality service offered to the receivers with better reception conditions. Using end-to-end distortion and coverage channel signal-to-noise ratio threshold measures, three specific embedded signaling modes are introduced. We demonstrate that a generalized embedding scheme provides a practical trade-off between distortion and coverage radius. The scheme is also formulated in terms of an optimization problem, seeking the best embedding factor for a given application. To verify the theoretical results, we idealize a dual rate transmission system over a Gaussian broadcast channel, in which receivers are distributed according to a circularly symmetric exponential pdf. The numerical results indicate that this model offers a higher per capita data rate comparing to the conventional single rate transmission systems. Application of this multirate broadcast holds promise for multiresolution transmission of digital audio and high definition television.

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Combined multilevel Turbo-code with MR-modulation

Cited by 5 publications

References 9 publications

Joint Multilevel Turbo Equalization and Continuous Phase Frequency Shift Keying

Joint Multilevel Turbo Equalization and Continuous Phase Frequency Shift Keying

Bibliography

Analysis of a Dual‐Rate Transmission Scheme for Gaussian Broadcast Channels

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