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Abstract-Markov Chain Monte Carlo methods have recently been applied as front-end detectors in multipleinput multiple-output (MIMO) communication systems. Moreover, the near capacity behavior of such detectors in low signal-to-noise ratio (SNR) regimes have been demonstrated through computer simulations. However, it has also been found that the MCMC MIMO detectors degrade in high SNR regimes. This paper investigates into the source of this degradation and proposes a number of ad hoc methods to resolve this undesirable behavior of the MCMC MIMO detectors.

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We introduce an architecture for a programmable IEEE 802.11ah Wi-Fi modem based on a new Cadence Xtensabased low-energy DSP. The design is based on a methodology for partitioning the system into hardware and software components that takes into account power consumption, silicon area and the need for programmability. Physical layer software functions avail the DSP's extensible architecture options for baseband processing, such as complex signal filtering and FFT acceleration instructions. We provide sensitivity data from software simulations and laboratory tests that demonstrate the modem is capable of reliable detection and decoding of 2MHz packets with -107dBm of received signal power. Additionally, we analyze latency requirements for a System-on-Chip (SoC) design.