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Communication security is one of the most significant issues to draw people's attention in vehicular ad-hoc networks (VANETs). To prevent from malicious nodes and ensure the confidence and integrity of the messages, vehicles have to authenticate each other and support message signature and encryption. As the most prospective approaches, though the generally accepted wireless access for vehicular environment...
The broadcast nature of visible light beam has aroused great concerns about the privacy and confidentiality of visible light communication (VLC) systems.In this paper, in order to enhance the physical layer security, we propose a channel scrambling scheme, which realizes orthogonal factorized channel scrambling with location information embedded (OFCS-LIE) for the VLC systems. We firstly embed the...
In this paper, we present a new equalizer based on probabilistic neural networks (PNN) for visible light communication (VLC) systems. While traditional artificial neural networks (ANN) type equalizers have to identify the distribution of the received signal, in our method kernel density estimation (KDE) is exploited to obtain the probability density function (PDF) of the states of the received signal,...
Since it is challenging to position the noncooperative receiver (Rx), especially when the backward frequency band of the Rx cannot be obtained by the anchors. In this paper, we propose a novel noncooperative Rx positioning method using full-duplex relay technique, where the anchors act as full-duplex relays for the Rx. It can trigger the close-loop-power-control (CLPC) between the transmitter (Tx)...
In wireless networks, determining the error bit positions within a packet at the receiver can improve the wireless retransmission efficiency in wireless communications. In this paper, we propose an Error Position Estimating Coding (EPEC) scheme based on Error Estimating Coding (EEC). Specifically, we divide data bits into several groups and indicate the group number individually to implement error...
In this paper we have considered a new resourse sharing approach for wireless access which is based on power assignment strategy, where two sources transmit their information simultaneously to the destination with the different power but use the same sub-band (time-frewquency unit). It discusses the concept of non-orthogonal multiple access (NOMA) which has a power multiplexing at the transmitter...
Wireless video multicast has become one of the key technologies to wireless applications. But the main challenge of wireless video multicast, i.e. the “cliff effect”, remains to be solved. SoftCast is a novel video coding and transmission scheme which allocates power to different coefficient chunks and transmits analog signals directly without quantization and entropy coding. It can solve the “cliff...
In cognitive radio systems, it is very challenging to estimate the channel gains from the cognitive transmitter to the primary receiver and even those between primary transceivers. Recent studies show that both kinds of the channel gains can be obtained if the cognitive user acts as a full-duplex relay in symmetric time-division duplex (TDD) primary systems. However, in practice, most systems are...
The principle, structure and characters of the trough solar thermal generation system were introduced. The status and development trend of the solar concentrator, receiver, Tracker and thermal storage systems were summarized. The development trend of trough solar thermal generation system was proposed.
The IEEE802.15.4 is a low-bit-rate wireless communicate standard that enables global inter-connectivity and inter-operability amongst Wireless Personal Area Network (WPAN) transceivers from different manufacturers. It is also considered as the PHY and MAC technology for Wireless Sensor Networks, which can be widely used for sensing, gathering and operating information in future smart cities. In Jan...
Distributed joint source-channel coding technique is finding its application in the ever evolving world of telecommunication, especially in the sensor network paradigm. The unique characteristics of the sensor networks are giving birth to new signal processing techniques and shifting the processing burden from the transmitter to the receiver side. The nodes of sensor networks, when deployed over particular...
An optimized soft-decision de-mapping method for Chinese Terrestrial DTV(Digital TV) Broadcasting Standard is proposed, which can be used on 64QAM, 32QAM, 16QAM and 4QAM de-mapping that compliant with the standard. Using the simplified de-mapping algorithm, the hardware resource usage and working speed are both optimized. Especially for 32QAM mode, comparing to traditional method, 75% hardware resource...
Easy implementation of receivers in practice is vital importance for the ultra wideband (UWB) system. This paper puts forward a novel noncoherent demodulation algorithm for UWB signal reception which detects UWB signal by using zero-crossing detection (ZCD) based on double thresholds. The description of algorithm, an analytical expression of the bit error ratio (BER) performance under the additive...
A communication system using multilayer coded modulation is introduced to detail the basic principles of hierarchical combined equalization based on linear minimum mean square error (MMSE) algorithm. A simplified hierarchical equalizer's extrinsic information of base-layer for 4-QAM multilayer coded modulation is presented. A new hierarchical equalization method of base layer is applied to multilayer...
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