Convolutional codes over rings for CPFSK signalling

Ugrelidze, Nodar; Shavgulidze, Sergo

doi:10.1049/el:19940590

Cited by 4 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…D 2 k (X, X ′ ) is actually the squared Euclidean distance between two signal sequences X and X ′ . When the conditional probability P (x k |x k−1 ) = P (x ′ k |x ′ k−1 ), the code design results for conventional ML decoding as in [4], [5] and [6]. In this work, we design the reconfigurable encoder that allows us to adjust one of the best encoder to the other.…”

Section: Design Of Reconfigurable Ring Convolutional Encodermentioning

confidence: 99%

The reconfigurable coding design of MPEG-4 medical image in time-varying Rician fading channels

Mahapakulchai

Jantaturaphan

2014

2014 14th International Symposium on Communications and Information Technologies (ISCIT)

View full text Add to dashboard Cite

We jointly design the reconfigurable ring convolutional encoders and reconfigurable convolutional interleavers for the MPEG-4 medical image transmission system. Our objective is to maintain our desirable system performance due to the variation of channels with the lowest system complexity. In order to gain the performance in burst noise environment, we usually apply an interleaver by trading off with the system complexity. However, for a given block-fading signal interval, Ns, we observe that the system performance reaches a certain value regardless of the number of shift registers in the interleaver, N . By adjusting the number of states in the best ring convolutional encoder, St, we summarize the simulation results in terms of the peak signal to noise ratio (PSNR) and word error rate (WER) system performance with N ranging from 5 to 30. The overall average PSNRs are obtained between around 11 and 28 dB by assigning St to 4, 8, 16 and 32 states. Moreover, we are able to achieve the highest average PSNR improvement up to 3 dB.

show abstract

Section: Design Of Reconfigurable Ring Convolutional Encodermentioning

confidence: 99%

The reconfigurable coding design of MPEG-4 medical image in time-varying Rician fading channels

Mahapakulchai

Jantaturaphan

2014

2014 14th International Symposium on Communications and Information Technologies (ISCIT)

View full text Add to dashboard Cite

show abstract

“…Up to now ring convolutional codes have been considered as the best candidates for encoded CPFSK [9]-[121.…”

Section: I74mentioning

confidence: 99%

“…There exist different possibilities to match error-control codes with CPFSK signals. Up to now ring convolutional codes have been considered as the best candidates for encoded CPFSK [9]-[121.…”

Section: G'(d) = P -'mentioning

confidence: 99%

“…The construction of encoded CPFSK systems is part of current research. Different combinations of error-control codes and CPFSK were investigated which considered the overall state complexity of the joint supertrellis and the achievable coding gain for maximum-likelihood sequence detection (MLSD) [ 11-[ 141. It was pointed out that in order to obtain both bandwidth and energy efficiency in such schemes, the most natural and advantageous method is the matching of ring convolutional codes with CPFSK [9]-[ 121. By means of Ungerboeck's technique [ 151, high rate encoded CPFSK systems having good characteristics have been recently constructed [14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generalized Concatenation of Encoded CPFSK Modulation

Hautle

Bossert

Shavgulidze

et al. 2000

Trans Emerging Tel Tech

View full text Add to dashboard Cite

Abstract. Using the principles of generalized concatenation we introduce a new design for coded M-ary CPFSK systems with modulation index h = l/M. This technique is based on a set partitioning method of inner CPFSK into nested subsystems with increasing free Euclidean distance which are combined with several outer convolutional codes having different error-correcting capabilities. In other words, we construct multilevel codes on the basis of inner modulation with memory, namely CPFSK. The new generalized concatenated constructions were simulated in an additive white Gaussian noise channel. The multistep decoding algoritm is described where for soft output decoding the well-known symbol-by-symbol maximum n posteriori probability (MAP) algorithm is applied to the inner CPFSK. A comparison of the generalized concatenated codes with the best known trellis-coded CPFSK schemes is also presented.

show abstract

“…Rimoldi and Li [9] also analyzed this combination, including the design of systematic codes for the partial response CPM. Also, Ugrelidze and Shavgulidze [10] designed new trellis codes based upon rate-1/2 M -ary ring convolutional codes and continuous phase frequency shift keying (CPFSK). Mahapakulchai and Van Dyck [11] proposed a TCM system using continuous-phase frequency-shift keying (CPFSK) and ring convolutional codes for transmitting the bits generated by an embedded zero tree wavelet encoder.…”

Section: Introductionmentioning

confidence: 99%

Code design and performance analysis in TCCPM system based on super trellis

Liu

Zhang

et al. 2013

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

This paper describes a technique related to the design of a trellis encoder, combined with the continuous phase modulation (CPM). Based on the idea of decomposing CPM into continuous phase encoder (CPE) and memoryless modulator (MM), superior trellis encoders are designed following Ungerboeck's set partitioning rules. Combinations are optimized with the squared minimum Euclidean distance based on the super trellis structure constructed by the trellis structure of trellis coded modulation (TCM) and CPE. Simulation results show that this new coding scheme consistently obtains better performance than previous schemes.

show abstract

Convolutional codes over rings for CPFSK signalling

Cited by 4 publications

References 2 publications

The reconfigurable coding design of MPEG-4 medical image in time-varying Rician fading channels

The reconfigurable coding design of MPEG-4 medical image in time-varying Rician fading channels

Generalized Concatenation of Encoded CPFSK Modulation

Code design and performance analysis in TCCPM system based on super trellis

Contact Info

Product

Resources

About