Optimal rate-reliability-delay tradeoff in networks with composite links
IEEE Transactions on Communications
Linear diversity-embedding STBC: design issues and applications
IEEE Transactions on Communications
To code in space and time or not in multihop relay channels
IEEE Transactions on Signal Processing
Distributed space-time diversity system using linear constellation precoding
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Layered video multicast using diversity embedded space time codes
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Joint resources allocation for cooperative video transmission
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
A cross-layer design for scalable mobile video
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
Distributed Space-Time Codes Using Constellation Rotation
Wireless Personal Communications: An International Journal
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Rate and diversity impose a fundamental tradeoff in wireless communication. High-rate space-time codes come at a cost of lower reliability (diversity), and high reliability (diversity) implies a lower rate. However, wireless networks need to support applications with very different quality-of-service (QoS) requirements, and it is natural to ask what characteristics should be built into the physical layer link in order to accommodate them. In this paper, we design high-rate space-time codes that have a high-diversity code embedded within them. This allows a form of communication where the high-rate code opportunistically takes advantage of good channel realizations while the embedded high-diversity code provides guarantees that at least part of the information is received reliably. We provide constructions of linear and nonlinear codes for a fixed transmit alphabet constraint. The nonlinear constructions are a natural generalization to wireless channels of multilevel codes developed for the additive white Gaussian noise (AWGN) channel that are matched to binary partitions of quadrature amplitude modulation (QAM) and phase-shift keying (PSK) constellations. The importance of set-partitioning to code design for the wireless channel is that it provides a mechanism for translating constraints in the binary domain into lower bounds on diversity protection in the complex domain. We investigate the systems implications of embedded diversity codes by examining value to unequal error protection, rate opportunism, and packet delay optimization. These applications demonstrate that diversity-embedded codes have the potential to outperform traditional single-layer codes in moderate signal-to-noise (SNR) regimes.