Sphere-packings, lattices, and groups
Sphere-packings, lattices, and groups
Fundamentals of wireless communication
Fundamentals of wireless communication
Algebraic number theory and code design for Rayleigh fading channels
Communications and Information Theory
Space-time codes from structured lattices
IEEE Transactions on Information Theory
On the sphere-decoding algorithm I. Expected complexity
IEEE Transactions on Signal Processing - Part I
Fading channels: information-theoretic and communications aspects
IEEE Transactions on Information Theory
A universal lattice code decoder for fading channels
IEEE Transactions on Information Theory
Diversity and multiplexing: a fundamental tradeoff in multiple-antenna channels
IEEE Transactions on Information Theory
On maximum-likelihood detection and the search for the closest lattice point
IEEE Transactions on Information Theory
New algebraic constructions of rotated Zn-lattice constellations for the Rayleigh fading channel
IEEE Transactions on Information Theory
Lattice coding and decoding achieve the optimal diversity-multiplexing tradeoff of MIMO channels
IEEE Transactions on Information Theory
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Space-time diversity enhancements using collaborative communications
IEEE Transactions on Information Theory
Transmitting to colocated users in wireless ad hoc and sensor networks
IEEE Transactions on Information Theory
On the achievable diversity-multiplexing tradeoff in half-duplex cooperative channels
IEEE Transactions on Information Theory
Coded modulation in the block-fading channel: coding theorems and code construction
IEEE Transactions on Information Theory
A unified framework for tree search decoding: rediscovering the sequential decoder
IEEE Transactions on Information Theory
Approximately universal codes over slow-fading channels
IEEE Transactions on Information Theory
On the Existence of Universally Decodable Matrices
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Cooperative lattice coding and decoding in half-duplex channels
IEEE Journal on Selected Areas in Communications
Multi-hop MIMO relay networks: diversity-multiplexing trade-off analysis
IEEE Transactions on Wireless Communications
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
DNCOCO'10 Proceedings of the 9th WSEAS international conference on Data networks, communications, computers
| Hi-index | 754.84 |
We study the Dynamic Decode-and-Forward (DDF) protocol for a single half-duplex relay, single-antenna channel with quasi-static fading. The DDF protocol is well known and has been analyzed in terms of the diversity-multiplexing tradeoff (DMT) in the infinite block length limit. We characterize the finite block length DMT and give new explicit code constructions. The finite block length analysis illuminates a few key aspects that have been neglected in the previous literature: 1) we show that one dominating cause of degradation with respect to the infinite block length regime is the event of decoding error at the relay; 2) we explicitly take into account the fact that the destination does not generally know a priori the relay decision time at which the relay switches from listening to transmit mode. Both of the above problems can be tackled by a careful design of the decoding algorithm. In particular, we introduce a decision rejection criterion at the relay based on Forney's decision rule (a variant of the Neyman-Pearson rule), such that the relay triggers transmission only when its decision is reliable. Also, we show that a receiver based on the generalized likelihood ratio test (GLRT) rule that jointly decodes the relay decision time and the information message achieves the optimal DMT. Our results show that no cyclic redundancy check (CRC) for error detection or additional protocol overhead to communicate the decision time are needed for DDF. Finally, we investigate the use of minimum mean-squared error generalized decision feedback equalizer (MMSE-GDFE) lattice decoding at both the relay and the destination, and show that it provides near-optimal performance at moderate complexity.