Harvind Samra

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In this paper, we present a simple, but effective method of enhancing and exploiting diversity from multiple packet transmissions in systems that employ nonbinary linear modulations such as phase-shift keying (PSK) and quadrature amplitude modulation (QAM). This diversity improvement results from redesigning the symbol mapping for each packet transmission.(More)
In this paper we present a simple, but effective method of creating and exploiting diversity from packet retransmissions in systems that employ nonbinary modulations such as PSK and QAM. This diversity results from differing the symbol mapping for each packet retransmission. By developing a general framework for evaluating the bit error rate (BER) upper(More)
In this paper, we develop some new automatic repeat request (ARQ) protocols for multiple-input multiple-out (MIMO) flat-fading channels which adapt the bit-to-symbol mapping of each ARQ retransmission. We begin by defining a model for distinctly mapped transmissions through flat-fading MIMO channels. We characterize the effect that such a mapping diversity(More)
This paper investigates the constrained capacity of sequential ARQ linear precoding in flat fading MIMO systems. To fully utilize the time diversity provided by ARQ, we derive the optimal linear ARQ precoders in flat fading MIMO channel with the objective of maximizing the mutual information delivered by multiple transmissions of the same packet. The(More)
Apertognathia (open bite) is usually a developmental deformity of the jaws and the dentoalveolar segments in childhood and adolescence. The sudden insidious appearance of an open anterior bite in adult life is extremely rare and may be due to pathologic condylar fractures (with displacement) or to bilateral condylosis. To the best of our knowledge, only(More)
In this paper, a new approach is presented to enhance receiver performance for ARQ communication systems that use systematic codes in rapidly-changing environments. This new approach involves a simple modification to the traditional turbo-equalizer by integrating multiple ARQ transmissions for joint equalization of systematic codewords. This modification(More)