1.672 Gigabits/s FPGA based Viterbi decoder for 4D 8PSK TCM
Digital Signal Processing
Design and implementation of an "approximate" communication system for wireless media applications
Proceedings of the ACM SIGCOMM 2010 conference
A novel weighted multilevel space-time trellis coding scheme
Computers & Mathematics with Applications
Multilevel signals and trellis coding for data communication modems
Computer Communications
Multilevel coding modulation system with binary block codes
Computer Communications
Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication
A practical transmit beamforming strategy for closed-loop MIMO communication
International Journal of Communication Systems
Interlevel-correlated orthogonal space–time block codes based on the expanded signal constellation
Wireless Communications & Mobile Computing
ACM SIGCOMM Computer Communication Review - Special october issue SIGCOMM '12
Performance of 16-state TCM MC-CDMA with various SUD techniques over downlink wireless channels
International Journal of Autonomous and Adaptive Communications Systems
Design and implementation of an "Approximate" communication system for wireless media applications
IEEE/ACM Transactions on Networking (TON)
| Hi-index | 754.84 |
A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth. This is achieved by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance. Soft maximum--likelihood (ML) decoding using the Viterbi algorithm is assumed. Following a discussion of channel capacity, simple hand-designed trellis codes are presented for 8 phase-shift keying (PSK) and 16 quadrature amplitude-shift keying (QASK) modulation. These simple codes achieve coding gains in the order of 3-4 dB. It is then shown that the codes can be interpreted as binary convolutional codes with a mapping of coded bits into channel signals, which we call "mapping by set partitioning." Based on a new distance measure between binary code sequences which efficiently lower-bounds the Euclidean distance between the corresponding channel signal sequences, a search procedure for more powerful codes is developed. Codes with coding gains up to 6 dB are obtained for a variety of multilevel/phase modulation schemes. Simulation results are presented and an example of carrier-phase tracking is discussed.