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Machine-to-machine (M2M) communications are expected to provide ubiquitous connectivity between machines without the need of human intervention. To support such a large number of autonomous devices, the M2M system architecture needs to be extremely power and spectrally efficient. This article thus briefly reviews the features of M2M services in the third(More)
In this paper we build a Software Defined Radio (SDR) testbed for the mobile broadcast system which using hierarchical modulation based on the USRP (Universal Software Radio Peripheral) platform. In hierarchical modulation, two separate data streams are modulated into one single stream. One stream, called the "High Priority" (HP) stream is embedded within a(More)
Recommended by Lingyang Song The problem of multiservice transmission in OFDMA-based cooperative relay networks is studied comprehensively. We propose a framework to adaptively allocate power, subcarriers, and data rate in OFDMA system to maximize spectral efficiency under the constraints of satisfying multiuser multiservices' QoS requirements.(More)
OBJECTIVE The aim of this study was to evaluate serum N-aminoterminal propeptide of type I collagen (P1NP), C-terminal telopeptide of type I collagen (β-CTX), and vitamin D status in healthy Chinese postmenopausal women. The study was also designed to investigate their possible relationships with osteoporosis phenotypes. METHODS A community-based(More)
—A hybrid system of cellular mode and device-to-device (D2D) mode is considered in this paper, where the cellular uplink resource is reused by the D2D transmission. In order to maximize the overall system performance, the mutual interference between cellular and D2D subsystems has to be addressed. Here, two mechanisms are proposed to solve the problem: One(More)