This paper presents an energy-efficient medium access control protocol suitable for communication in a wireless body area network for remote monitoring of physiological signals such as EEG and ECG. The protocol takes advantage of the static nature of the body area network to implement the effective time-division multiple access (TDMA) strategy with very… (More)
Low Density Parity Check (LDPC) codes over GF(2 m) are an extension of binary LDPC codes that have not been studied extensively. Performances of GF(2 m) LDPC codes have been shown to be higher than binary LDPC codes, but the complexity of the encoders/decoders increases. Hence there is a substantial lack of hardware implementations for LDPC over GF(2 m)… (More)
—With the advent of deep submicron CMOS technology, process parameter statistical variations are increasing resulting in unpredictable device behaviour. The issue is even aggravated by low power requirements which are stretching transistor operation into near/sub threshold regime. Consequently, traditional delay models fail to accurately capture the circuit… (More)
—In communication systems, channel quality variation is a well known phenomenon, which fundamentally influences the decoding process. While most of the time, the transmission takes place in good signal to noise conditions, to satisfy QoS requirements in all cases, telecom platforms rely on largely over-designed hardware, which may result in energy waste… (More)
We study a class of quasi-cyclic LDPC codes. We provide precise conditions guaranteeing high girth in their Tanner graph. Experimentally, the codes we propose perform no worse than random LDPC codes with their same parameters, which is a significant achievement for algebraic codes.
— This paper describes an FPGA implementation of a decoder for a particular family of low density parity check (LDPC) codes, the quasi-cyclic LDPC codes. The structure of a quasi-cyclic code is well known and allows us to reduce the complexity of the interconnections between bit nodes and check nodes. The decoder has a semi-parallel architecture and it… (More)
Keywords: Body sensor network Health care Dry surface sensors ECG Energy efficient wireless node a b s t r a c t Ubiquitous vital signs sensing and processing are promising alternatives to conventional clinical and ambulatory healthcare. Novel sensors, low power solutions for processing and wireless connectivity are creating new opportunities for wearable… (More)