Combined multilevel coding and multiresolution modulation

Fazel, K.; Ruf, M.J.

doi:10.1109/icc.1993.397444

Cited by 36 publications

(13 citation statements)

References 6 publications

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“…MLSTTC employs STTC as component code for multilevel coding of information. It utilizes multi‐resolution modulation (MRM) partitioning technique for the mapping of coded symbols to M‐ary quadrature amplitude modulation ( M ‐QAM) constellation. The mapped symbols are transmitted to the receiver.…”

Section: Introductionmentioning

confidence: 99%

Multilevel space–time trellis coded cooperation with channel state information at transmitter

Aneja

2016

Int J Communication

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SUMMARYIn this paper, the authors propose a system where a number of cooperating mobile nodes transmit information to a common destination node. Each cooperating node has a set of decoders to detect the information of other nodes and a set of encoders to further encode the decoded information as well as its own information using multilevel space-time trellis coding (MLSTTC) scheme. The coded information is mapped using multi-resolution modulation partitioning to M-ary quadrature amplitude modulation constellation. The mapped symbols are weighted based on the available channel state information at transmitting nodes. The weighting of transmitting symbols provides beamforming resulting in receive signal-to-noise ratio gain. The weighted symbols are sent to destination node through two transmit antennas. If the information of other nodes has been correctly decoded at the cooperating node, then the destination node receives the information of each node as many times as there are number of transmitting nodes, thus achieving full diversity order. A multistage Viterbi decoder is used at the destination node to extract information of each mobile node. The results indicate that the performance of proposed cooperative MLSTTC system is superior to non-cooperative MLSTTC system.

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Section: Introductionmentioning

confidence: 99%

Multilevel space–time trellis coded cooperation with channel state information at transmitter

Aneja

2016

Int J Communication

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“…He showed that for broadcasting, where a source transmits to the multitude of receivers having different receiving conditions, the optimal broadcast scenarios are multiresolution in character. In a recent paper [4] a combined multilevel coding and multiresolution modulation using a special Set-Partitioning technique has been discussed. Then in [3], the interest of multiresolution modulation for the transmission of a HDTV signal, has been shown.…”

Section: Introductionmentioning

confidence: 99%

<title>Three-level hierarchical HDTV broadcasting system</title>

Fazel¹,

Ruf²

1993

SPIE Proceedings

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Digital HDTV broadcast differs from digital point-to-point transmission in that different receivers have reception condition which depend on the distance from the emitter and on the others disturbances (multipaths, shadowing, etc...). Therefore, a very robust transmission concept taking into account the graceful degradation effect is required. The aim of this article is to show the possibility of designing a transmission scheme supporting three-level hierarchical HDTV signal: HDTV, TV , and Personal Video PV for stationary and portable receivers, respectively. The system is based on a combination of Multiresolution Modulation and Multilevel coding using the principle of OFDM to combat against multipath interferences. The system is designed such that different receiver can receive its desired signal with different complexity according to the image quality. The system also supports graceful degradation. The optimization of the different parameters of the system is done under different reception conditions i.e. we suppose that a HDTV/TV image signal is received in an AWGN/Rician fading channel condition. And a PV image quality is expected in a Rician/Rayleigh fading channel. An example of combined Rate-Compatible-Punctured-Convolutional codes with 3-resolution 64-QAM in a 8MHz channel showed that even if the received power of a portable receiver is 29dB lower than a stationary receiver, one can achieve the desired hierarchical image qualities in these channels.

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“…One may use traditional constellations like 8-PSK or 64-QAM as well as non-uniform constellations, so-called hierarchical modulation [26] or multiresolution modulation [25]. When UEP is desired, non-uniform constellations have the advantage that they can provide greater differentiation in error probabilities of the bit positions in the symbol than traditional constellations.…”

Section: B Modulationmentioning

confidence: 99%

“…We design UEP-LDPC codes using sub-degree distributions both for the protection classes and for the classes of bits with different protection resulting from the modulation. This allows for a very flexible code design where any conventional modulation scheme, like M -QAM or M -PSK as well as more complex schemes like hierarchical constellations [25], may be used. The separation of the variable node degree distribution into sub-degree distributions significantly increases the number of design parameters.…”

Section: Introductionmentioning

confidence: 99%

Design of bandwidth-efficient unequal error protection LDPC codes

Sandberg

Deetzen

2010

IEEE Trans. Commun.

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Abstract-This paper presents a strategy for the design of bandwidth-efficient LDPC codes with unequal error protection. Bandwidth efficiency is obtained by appropriately designing the codes for higher order constellations, assuming an AWGN channel. The irregularities of the LDPC code are designed, using the Gaussian approximation of the density evolution, to enhance the unequal error protection property of the code as well as account for the different bit error probabilities given by the higher order constellation. The proposed code design algorithm is flexible in terms of the number and proportions of protection classes. It also allows arbitrary modulation schemes. Our method combines the design of unequal error protection LDPC codes for the binary input AWGN channel with the code design for higher order constellations by dividing the variable node degree distribution into sub-degree distributions for each protection class and each level of protection from the modulation. The results show that appropriate code design for higher order constellations reduces the overall bit-error rate significantly. Furthermore, the unequal error protection capability of the code is increased, especially for high SNR.Index Terms-LDPC, unequal error protection, higher order constellations, bandwidth efficiency

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Combined multilevel coding and multiresolution modulation

Cited by 36 publications

References 6 publications

Multilevel space–time trellis coded cooperation with channel state information at transmitter

Multilevel space–time trellis coded cooperation with channel state information at transmitter

<title>Three-level hierarchical HDTV broadcasting system</title>

Design of bandwidth-efficient unequal error protection LDPC codes

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