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Sparse code multiple access (SCMA) is a competitive non-orthogonal multiple access technique for the fifth generation (5G) wireless communications. The SCMA codebook design is a very essential problem. This paper presents a constellation-rotation-based method for designing codebooks for downlink SCMA system. The basic idea is to make the minimum Euclidean distance of the main-constellation as larger...
This paper presents Multiple Radio Access Technologies(M-RATs) cooperative model for Device- to-Device (D2D) communications, which depends on both the licensed and unlicensed spectrum. The notion of cooperation factor is introduced to capture and analyze the threshold constraint in cooperation scenes. This paper also derives the coverage probability and link spectrum efficiency in typical RAT, which...
Light detection and ranging (LIDAR) systems offer fast detection and high spatial resolution for imaging and mapping in a host of applications, such as robotics, automotive, agriculture, military, and spaceflight. This paper presents a high-resolution LIDAR sensor system-on-a-chip (SoC) prototype containing a 31×2 pixel channel array with the input time-of-flight (ToF) resolved by a 32×1 time-to-digital...
As one of the candidate wireless access techniques of 5G system, non-orthogonal multiple access (NOMA) is a power domain non-orthogonal multiple-access technique, which can greatly enhance spectral efficiency and system capacity. This paper mainly focus on user pairing and access theme of NOMA system, and respectively presents channel state sorting pairing algorithm (CSS-PA) as user pairing (UP) theme...
In order to sort signals from the emitters with the same type, a sorting method based on fractal dimensions of pulse envelope's front edge is proposed in this paper. Firstly, a novel signal sorting flow based on fractal dimensions is presented. Then the approach for extracting the box dimension and information dimension of the pulse envelope's front edge is given. Finally, simulated signals and actual...
A 25Gb/s hybrid-integrated microring receiver which includes a thermal tuning loop that stabilizes the drop filter resonance wavelength is implemented. The multi-channel 65nm CMOS source-synchronous receiver achieves −8.2 dBm sensitivity at BER <10−12 and 0.68pJ/b.
The physical-layer network coding (PNC) is very attractive, since it takes full advantages of interference signals at the relay node, therefore improves the channel capacity significantly. However, the flat fading channel would destroy the sum signal received at relay node, leading to detection error and capacity damage. In this paper, a pre-coding scheme for the multi-user PNC (MU PNC) is proposed,...
In this paper, a turbo equalization scheme for MIMO-OFDM systems under imperfect channel estimation based on soft-input soft-output (SISO) minimum mean-square error (MMSE) sorted QR decomposition (SQRD) is proposed. A turbo structure consists of a SISO detector and a SISO decoder where extrinsic information is exchanged between the two SISO modules. Turbo equalization schemes are preferable in practical...
The Global Navigation Satellite System (GNSS) has been widely used by militaries as well as civilians. Generally, the locating accuracy is high, but the system is lack of immunity against spoofing attack, which may deceive the receiver into error positioning. In order to deal with the problem, a maximum particle weight monitoring scheme based on particle filter (PF) is proposed for spoofing detection...
Recently, much effort has been made for implementation of back-pressure scheduling in wireless networks. In this paper, we explore the implementation of back-pressure-based forwarding in wireless sensor networks. For this purpose, we propose Gradient-pressure, a practical Gradient-assisted anycast-based back-pressure framework for wireless sensor networks. Gradient-pressure introduces gradient information...
Smart metering utility network (SUN) is an emerging wireless technology to enable intelligent system control and information transfer in smart grid applications. However, the operation of SUNs on unlicensed bands is very sensitive to both internal and external interferences. This paper aims at internal interference analysis of SUNs in terms of packet error rate (PER) of a victim SUN receiver. We first...
In this contribution, a multiple-input multiple-output heterogeneous network with physical-layer network coding is considered. The article proposes a coordinated joint transmitter and receiver design to tackle the interference problem between two-way relaying channel in small cell and uplink channel in macro cell. We design the transceiver on the basis that the data streams from two-way communication...
Presented in this paper is an experimental research on the mobile sensor and communication system based on transmitting with ultraviolet in either line-of-sight or non-line-of-sight conditions. The performance of this type of communication system is shown on the experimental platform which is set up. It proves the feasibility of ultraviolet communication system.
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