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In this paper, we study multiuser detection for asynchronous uplink machine-to-machine systems with code division multiple access. We formulate the maximal logarithmic likelihood problem for asynchronous multiuser detection via joint channel gains, time delays and transmission symbols detection. We present the design for pilot sequence and propose an adaptive step-size method with low complexity to...
This paper investigates multiuser detection for an uplink asynchronous machine-to-machine system with massive number of machine type communication devices (MTCDs). The goal is to detect the device activity, time delay, channel gain and transmission data for a grant-free three-phase access scheme where each MTCD first transmits its pilot sequence, then remains silent for a period of time, and finally...
In this paper, we investigate the sum energy minimization problem in an uplink machine-to- machine (M2M) system with energy harvesting. To solve this nonconvex sum energy minimization problem, we first transform it into an equivalent convex problem and provide the optimal condition of the original problem. Then, we propose a low- complexity iterative scheme, which yields the optimal solution. The...
The vast amount of the machine type communication devices (MTCDs) in machine-to-machine (M2M) communications and their limited energy budget are the crucial challenges to transmission scheme design. This paper proposes an energy-efficient power control and time scheduling scheme in M2M communications with non-orthogonal multiple access (NOMA) and energy harvesting. User equipment (UEs) are configured...
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