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Device-to-device (D2D) content sharing has become a promising solution to support the growing popularity of multimedia contents for local services. Considering the randomness of content location, the limited storage and transmission capability of devices, and the coexistence of altruistic and selfish user behaviors, how to optimally match the demanders to the providers of contents and how to stimulate...
Fall detection is one of the feasible solutions for solving the problem of aging of population. This paper presents an algorithm to detect falling for the elderly with one wrist-worn device. The algorithm has lower computation complexity to determine the fall event according to the inclination gradient. Experimental results show that it performs better than another similar devices with the average...
In this paper we study low complexity linear receivers for millimeter-wave (mmWave) communication systems with uniform circular arrays (UCAs) in line-of-sight (LOS) multiple-input multiple-output (MIMO) channels. Typical applications are fixed wireless access such as small cell backhaul for high rate large capacity communications. Conventional zero forcing (ZF) and minimum mean squared error (MMSE)...
In this paper we investigate low complexity millimeter-wave communication systems for uniform circular arrays (UCAs) in line-of-sight (LOS) multiple-input multiple-output (MIMO) channels. We first demonstrate that the MIMO channel matrices for UCAs in LOS-MIMO channels are circulant matrices. Then, we show that the channel matrices can be made orthogonal by choosing the array diameters appropriately...
Heterogeneous wireless sensor network (HWSN) consists of sensor nodes with different ability, such as computing power and sensing range. Compared with homogeneous wireless sensor network, the design of protocols for such networks has to be more complex due to the energy constraint in order to prolong the lifetime of the network. As energy consumption mostly comes from the radio transmissions, bandwidth...
In this paper, a linear Channel Orthogonalization (CO) algorithm with low complexity is presented, which is applicable to systems with an arbitrary number of antennas and users. Unlike other conventional linear methods, CO obtains the orthonormal basis to achieve the precoding matrix by means of using Schmidt Orthogonalization method. Then, the algorithm (CO-THP) combining CO with Tomlinson-Harashima...
Antenna selection with less radio frequency (RF) chains could reduce the system cost and power consumption in wireless communications. Conventional antenna selection criteria such as signal-to-interference-plus-noise ratio (SINR) and minimum mean square error (MMSE) that are suitable for linear receivers could not provide optimal performance for ordered successive interference cancellation (OSIC)...
In this paper we propose low complexity optimum transmit antenna selection algorithms for wireless spatial multiplexing (SM) systems. Antenna selection with less radio frequency (RF) chains could significantly reduce the system cost and power consumption. Antenna selection criteria such as maximum minimum signal to interference plus noise ratio (SINR) and MMSE require computation of matrix inverse...
Pseudorandom sequences with good randomness properties may be used widely in stream ciphers or communications. In this paper, we construct a new generalized cyclotomic sequence of order four and length pq, and determine the linear complexity of the sequence. The results show that the new sequence have quite good linear complexity.
In this paper, we study low complexity double space time transmit diversity (D-STTD) and orthogonal frequency division multiplexing (OFDM) system with antenna shuffling. We propose a novel antenna shuffling method based on the criterion of minimizing the condition number of channel correlation matrix. The condition number is an indicator about the quality of the channel. By selecting the minimum of...
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