Trellis Phase Communications LP

United States

Trellis Phase Communications LP

United States
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Hu Y.,University of Texas at Dallas | Fonseka J.P.,University of Texas at Dallas | Bo Y.,University of Texas at Dallas | Dowling E.M.,Trellis Phase Communications LP. | Torlak M.,University of Texas at Dallas
IEEE Transactions on Vehicular Technology | Year: 2017

Constrained interleavers are used in constrained turbo product codes (CTPCs) and constrained turbo block-convolutional (CTBC) codes. The constrained interleaver delivers an interleaver gain close to uniform interleaving while also increasing theminimum Hamming distance. In this study, new and improved single row(SR) versions of the previous codes, called SR-CTPCs and SR-CTBC codes, are introduced that have higher interleaver gain, better performance, and much more flexible frame sizes as needed in wireless applications. Compared with the WiMax and the longterm evolution standards, it is demonstrated that SR-CTPC and SR-CTBC codes perform better than those currently used in the wireless standards. © 2016 IEEE.


Hu Y.,University of Texas at Dallas | Fonseka J.P.,University of Texas at Dallas | Dowling E.M.,Trellis Phase Communications LP
IEEE Transactions on Vehicular Technology | Year: 2017

Constrained interleaved coded modulation (CICM) is introduced to map coded bits onto higher order signal constellations. A reverse Gray coding (RGC) constellation mapping policy is introduced to map groups of bits onto a selected signal constellation. Then, a CICM interleaver is designed to jointly achieve both the highest possible minimum symbol Hamming distance (MSHD) and the highest possible minimum squared Euclidean distance (MSED) for use with the selected RGC-encoded constellation. It is demonstrated that CICM schemes constructed with simple block codes can be decoded with reduced coding complexity while performing better than more-complicated TCM and BICM-ID schemes known in the literature. © 1967-2012 IEEE.


Fonseka J.P.,University of Texas at Dallas | Dowling E.M.,Trellis Phase Communications LP
IEEE Communications Letters | Year: 2011

Compact pulse shaping (CPS) is considered with PAM/QAM signals to improve the performance/bandwidth tradeoff. CPS signals are constructed by targeting a finite impulse response of a pulse shaping filter as opposed to the traditional method of targeting a finite frequency response. CPS QAM signals can be optimally decoded using Viterbi decoding on I and Q channels independently. In the case of non-rectangular constellations, a simple adjustment is presented to correct any invalid QAM symbols that result from independent I and Q decoding. Minimum distance calculations indicate that CPS QAM provides between 2.04 and 5.4 dB of gain, depending on constellation size, over raised cosine filtering, when compared at a given value of the normalized bit bandwidth B 99Tb. © 2011 IEEE.


Han S.I.,University of Texas at Dallas | Fonseka J.P.,University of Texas at Dallas | Dowling E.M.,Trellis Phase Communications LP
IEEE Photonics Technology Letters | Year: 2014

Constrained turbo block convolutional (CTBC) codes are developed for 100 G and beyond optical transmissions. The CTBC codes developed herein each fit within one optical transport network (OTN) frame. The CTBC codes involve a simple outer block code that is serially concatenated with a simple inner recursive convolutional code using a constrained interleaver that simultaneously delivers a high interleaver gain and a high minimum Hamming distance. Codes with 11.1 dB net coding gain (NCG) at 12.5% overhead (OH), 11.3 dB NCG at 15% OH, 11.6 dB NCG at 20% OH, and 11.9 dB NCG at 23.4% OH are reported. Compared with other codes that have been previously proposed for OTN applications, CTBC codes have much lower encoding/decoding complexity, improved NCG/OH tradeoffs, and avoid negative error floor effects. © 1989-2012 IEEE.

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