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Convolutional encoder is widely applied in lots of wireless communication standards including 3G/4G mobile communications, DVB (Digital Video Broadcasting), IoT(Internet of Things) transmissions and so on. Therefore multi-standard Viterbi decoder design for the above receivers is a hot issue. In this paper, a reconfigurable high performance Viterbi decoder design is proposed for LTE, WiMAX, CDMA2000,...
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
Conventional simultaneous wireless information and power transfer (SWIPT) schemes generally assume that only the currently harvested energy will be used for the following signal forwarding. As a result, it is impossible to amplify the signal in theory. And even unfortunately, the forwarded signal power is splitted and the forwarded signal will be subject to severe attenuation when compared to the...
The L-Band Digital Aeronautical Communication System (LDACS) is a typical pilot-aided orthogonal frequency division multiplexing (OFDM) communication system. With the performance of LDACS in the Unmanned Aerial Vehicle (UAV) over-water channel, the pilot is redesign based on Zadoff-Chu (ZC) sequence. The new periodic ZC-pilot could reduce the effects of noise by correlated calculation. Based on new...
OFDM suffers from high spectrum sidelobes and lacks the ability to support an important feature of 5G and future wireless communications: flexible numerology. To overcome these shortcomings, we consider in this paper filtered OFDM (F-OFDM) as a candidate solution, which is able to provide greater flexibility and adaptability than traditional CP-OFDM. We propose filters constructed by filter banks...
In the research of vehicular Ad Hoc network (VANET), integrated VANET and LTE heterogeneous network is a frontier topic as it meets the needs of data transmission as well as Internet access, where the value of cellular based clustering algorithm is prominent. In this paper, we analyze transmission opportunity and capacity in cellular based clustered VANET with stochastic geometry tools. Vehicular...
Natural disasters frequently occur all over the world in recent years, and the disaster research is called for concern. The current research shows that a disaster often causes different kinds of other secondary disasters, therefore the related aspects about disaster chain is needed to be intensively investigate. This paper firstly introduces the state of art of disaster chain and then adapts the complex...
In order to improve the error resistance and security of JPEG2000 standard, a joint source channel and security arithmetic coding/decoding scheme for EBCOT in JPEG2000 is proposed. Based on error resistant arithmetic coding, this scheme inserts multiple forbidden symbols and generates secure two-way decodable bitstream controlled by chaotic maps, improving the security of the scheme. Meanwhile, at...
When a large scale disaster strikes, it demands an efficient communication and coordination among first responders to save life and other community resources. Normally, the traditional communication infrastructures such as landline phone or cellular networks are damaged and dont provide adequate communication services to first responders for exchanging emergency related information. Wireless mesh...
This paper presents a variational Bayesian-based adaptive unscented particle filter (VB-AUPF) to improve the positioning accuracy of BDS/INS integrated system under the condition without accurate measurement noise covariance. This method approximates the joint posterior distribution of states and measurement noise by using variational Bayesian approach on each time step. Based on this, the measurement...
A compact tri-band bandpass filter (BPF) designed using the stub-loaded stepped-impedance resonator (SL-SIR) is presented in this paper. The characteristics of the SIR are firstly studied by using the even-/ odd-mode analysis method. In order to reduce the overall size, a stepped-impedance meander loop resonator is used to design the tri-band BPF. By optimizing the structural parameters, a tri-band...
In this paper, we studied the irregular row weight problem of DVB-S2 LDPC short frame. This problem will cause the failure of decoding. Based on a special structure of check matrix address table, we have achieved a simple and common solution to the problem.
Chirp spread spectrum has poorly rate of transmission in shallow water acoustic channel because of its channel parameters in the random changes. This paper proposes a novel chirp spread spectrum modulation system based on the explicit relationship between fractional Fourier transform (FRFT) properties of Chirp-FSK signals and their parameters (Chirprate and central-frequency). The system is easy to...
With Android application packing technology evolving, there are more and more ways to harden APPs. Manually unpacking APPs becomes more difficult as the time needed for analyzing increase exponentially. At the beginning, the packing technology is designed to prevent APPs from being easily decompiled, tampered and re-packed. But unfortunately, many malicious APPs start to use packing service to protect...
Harmonious coexistence between LTE with Licensed-Assisted Access (LTE-LAA) and WIFI is a research issue due to deploying LTE to unlicensed spectrum 5GHz. Listen-before-talk (LBT) scheme works as a requisite in unlicensed spectrum to ensure the fairness among different radio access technologies (RATs). To reduce the collision caused by relatively fixed contention window (CW) of LBT scheme and ensure...
In this paper, the secrecy performance of full-duplex jamming SWIPT system is conducted where multiple eavesdroppers intercept the confidential information individually. The closed-form expressions of the connection outage probability (COP), the secrecy outage probability (SOP), the reliable-secure probability (RSP) and the secrecy throughput are obtained, which depict the secrecy performance of the...
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