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The emerging of millimeter wave (mmWave) communications has been widely predicted to revolutionize the traditional communications. On one hand, the large bandwidth provided by mmWave is orders of magnitudes larger than that provided by current microwave communications, which therefore supports much higher throughput as well as massive connectivity. On the other hand, the small wavelength of mmWave...
The New Zealand Government has set the goals of having 99% of Kiwis able to access broadband with peak speeds of at least 50 Megabits per second (Mbps) by 2025, and with the remaining 1% able to access broadband with rates of at least 10 Mbps. There is an interesting question to be raised: is it possible to achieve these goals earlier? Inspired by the United Nations' Sustainable Development Goals...
In this paper, we propose an advanced polar encoding scheme with successive cancellation list (SCL) decoder for visible light communication (VLC). As much high-profile channel coding methods, polar codes have achieved the symmetric capacity of binary-input discrete memoryless channels (B-DMCs) based on channel polarization. By taking advantages of simple recursive encoding structure and confirmed...
Aiming at the problem of slow convergence and local optimum in motor fault diagnosis, a new method of motor fault diagnosis based on fuzzy petri net was proposed, in order to improve the accuracy of fuzzy petri network diagnosis system, the mutative scale back propagation(BP) algorithm was used to optimize the network parameters, then the classification of several kinds of motor faults were completed...
Silver is a widely used protective coating material in electrical connectors, since it has good resistance to oxidation and thus is not affected by corrosion and fretting corrosion. The dominating mechanism for failure in silver coated electrical contacts is fretting wear. Recently, wear between silver-silver contacts has been analyzed and adhesion is recognized as the dominating mechanism during...
Motivated by the interest in using light-emitting diode (LED) for underwater optical communication, experiments with low transmitting power and high receiving sensitivity are conducted. On-off keying (OOK) modulation is employed, and 7.5 Mbps and 500 kbps bit rates are achieved with transmitting distances of 10 m and 50 m respectively. For 10 m transmitting distance experiment, the bandwidth limitation...
The integration of radar and communication has attracted general interest with its advantage of equipment miniaturizing and high efficiency of spectrum, especially in intelligent transportation systems because of the need for transmitting and detecting simultaneously and the lack of room for various devices. Among various integration schemes, the integrated waveform which realizes transmitting and...
This paper proposes a novel doubly selective channel estimation scheme for MIMO-OFDM systems with both time- and frequency-domain training (TFDT) based on structured compressive sensing (SCS). The characteristics of the doubly selective channel is considered in three dimensions, i.e., sample-domain, tap-domain, and antenna-domain. The tap-domain channel impulse responses (CIRs) are jointly sparse,...
An iterative-weighted-average algorithm for background modeling in surveillance video scenarios is proposed in this paper. Through allocating the pixel values at the same position in several consective frames in a sliding time window with different weight values during the iterative process, the influence of foreground pixel values on background modeling can be removed immediately without requiring...
In this paper, a spectral efficient channel estimation scheme is proposed for spatial-correlated sparse massive multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with superimposed time-frequency training sequences (TSs) based on basis expansion model (BEM). This scheme first relies on the identical time-domain TS to acquire the partial channel common support,...
In spatial modulation (SM) systems, the distribution of amplitude-phase modulation (APM) symbol causes the tradeoff of detection performance between APM symbol and active antenna, which infers the overall capacity of SM system. In this paper, the APM constellation and symbol labeling of SM system is investigated. The optimized APM constellation is designed to maximize the system coded modulation average...
The non-orthogonal multiple access (NOMA) technology has been proposed and regarded as one of the potential promising technologies for the future 5G network. The extension of generalized spatial modulation multiple-input multiple-output (MIMO) to NOMA system improves both the spectral and energy efficiencies of the system, while maintaining the massive connectivity and low latency advantages, but...
The combination of multiple-input multiple-output (MIMO) and bit-interleaved coded modulation (BICM)/BICM with iterative demapping (BICM-ID) is one of the key technologies to meet the high-transmission-rate requirement of the next generation broadcasting systems. However, conventional low-density parity check (LDPC) coded MIMO BICM schemes always show poor performance with iterative demapping, and...
In this paper, we investigate the impact of channel coding on two kinds of non-orthogonal multiple access (NOMA) schemes, either with a successive interference cancellation (SIC) receiver or with a joint decoding (JD) receiver. Firstly, the information-theoretic individual achievable signal-to-noise ratio (SNR) regions of SIC and JD are analyzed. Then single-user-oriented (SU) code and multi-users-oriented...
In this paper, we propose a new method in which the recently proposed non-orthogonal multiple access (NOMA) is combined with the conventional Alamouti scheme. The developed analytical results and simulation both show that if the targeted data rates and the allocated power satisfy an inequality constraint, then our proposed method can effectively increase the diversity order of NOMA from 1 to 2, the...
A real-time high-speed visible light communication (VLC) system based on RGB-LEDs is proposed in this paper. With the use of the wavelength-division multiplexing (WDM), the system enables three individual color channels. The physical layer of the system is based on time-domain synchronous OFDM (TDS-OFDM) technology. Digital pre-distortion method also is applied to improve the SNR performance. Experiment...
Flat-fading channel models are usually invoked for analyzing the performance of massive spatial modulation multiple-input multiple-output (SM-MIMO) systems. However, in the context of broadband SM transmission, the severe inter-symbol-interference (ISI) caused by the frequency-selective fading channels can not be ignored, which leads to very detrimental effects on the achievable system performance,...
Uplink grant-free non-orthogonal multiple access (NOMA) is promising for machine-to-machine (M2M) communications to meet the requirement of sporadic short packets transmission of massive devices. In this paper, successive interference cancellation (SIC) and joint decoding (JD), as two well-known decoding techniques for NOMA, are analyzed for M2M random access. Due to the sporadic small packet transmission,...
Channel estimation for underwater acoustic (UWA) channels in orthogonal frequency division multiplexing (OFDM) systems is one of the most difficult problems in UWA communications. Because UWA channels are both frequency-selective and time-selective, the total number of channel coefficients to be estimated will significantly increase. Besides, the fast time-varying characteristics and strong Doppler...
In generalised spatial modulation (GenSM) systems, the total number of active antenna groups is always not a power of two, which leaves room for designing an active antenna group (AAG) selection algorithm to achieve the constellation shaping gain and to improve the symbol error rate (SER). In this paper, based on uniform-cost search, a novel iterative AAG selection algorithm for GenSM systems is proposed...
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