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Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Signal Processing is the property of Journal of Signal Processing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

According to the symbol error eate (SER) of the superimposed constellation, the near-optimal space code multiple access (SCMA) codebooks were explored under uplink and downlink Rayleigh fading channels, respectively.A near-optimal codebook design scheme was proposed based on the mathematical model between the superimposed constellation and the SER formula.And the proposed design procedures could be summarized as follows, design the factor graph matrix, match the best codeword pair, and find the optimal angle.Numerical results are provided to demonstrate that the proposed scheme can achieve near-optimal SER performance.

The outage performance of the cognitive relay networks is analyzed based on simultaneous wireless information and power transfer (SWIPT) and non-orthogonal multiple access (NOMA). The analytical expressions of overall outage probability and asymptotic expressions on high signal-to-noise ratio (SNR) are derived for the direct link transmission mode and the two-stage communication transmission mode. The analytical expressions are validated by Monte-Carlo simulations. The simulation results demonstrate that the outage performance is improved by through the direct link transmission. Furthermore, compared with the conventional cognitive relay networks with orthogonal multiple access (OMA), superior outage performance and high energy efficiency are achieved for the cognitive relay networks based on SWIPT-NOMA. [ABSTRACT FROM AUTHOR]

The outage performance of the cognitive relay networks is analyzed based on simultaneous wireless information and power transfer (SWIPT) and non-orthogonal multiple access (NOMA). The analytical expressions of overall outage probability and asymptotic expressions on high signal-to-noise ratio (SNR) are derived for the direct link transmission mode and the two-stage communication transmission mode. The analytical expressions are validated by Monte-Carlo simulations. The simulation results demonstrate that the outage performance is improved by through the direct link transmission. Furthermore, compared with the conventional cognitive relay networks with orthogonal multiple access (OMA), superior outage performance and high energy efficiency are achieved for the cognitive relay networks based on SWIPT-NOMA. [ABSTRACT FROM AUTHOR]

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Posts & Telecommunications (Natural Science Edition) is the property of Chongqing University of Posts & Telecommunications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the Pulse Position Modulation (PPM) space optical communication channel estimation based on photon detection, two schemes for the estimation of signal photon average and background photon average are proposed. Scheme 1 is based on the characteristic of M order PPM, where only one of the M soots has a sggnal optical slot. The sggnal photon average and the back-ground photon average are roughly estimated by comparing the number of photons rn each soot rn each symbol counted by the photon detector and by counting the total number of photons in each soot in the error correction frame. The proposed method rn scheme 2 js based on that n scheme 1. The sggnal optical soot poston js re-determined by dedsion feedback n the Serially Con-catenated Pulse Poston Modu!ation (SCPPM) system. Since the exsstence of SCPPM accumulator leads to error propagation, the soft information output by decoding ss irst nntereeaved, and then mapped from btt to PPM symbol after hard deiion and accumu!ation. Frnally, the poston of sggnal optical soot is re-determined to obtarn more accurate sggnal photon average and background photon average. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal on Communication / Tongxin Xuebao is the property of Journal on Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A kind of high-order integrated radar communication waveform pulse was proposed,which combined 16QAM and LFM together.The new waveform took LFM signal as the carrier of the 16QAM,so that high communication capacity was achieved and the radar performance was not impacted.The analysis and computer simulation for the 16QAM-LFM waveform show that the new waveform has the same bit error rate as the classic 16QAM signal and larger spectrum efficiency compared with the integrated waveforms such as BPSK-LFM and MSK-LFM.Furthermore,the computational complexity of 16QAM-LFM is less than the existing OFDM-LFM waveform.On the other hand,16QAM-LFM has higher distance resolution and speed resolution than the traditional LFM pulse signal since its ambiguity function looks like a thumb tack.And the detection probability of radar is similar as traditional LFM pulse signal for the slowly moving object.

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Signal Processing is the property of Journal of Signal Processing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To improve the delay and throughput performance of wireless sensor network ( WSN), this paper proposed a dualhop, multi-source and multi-relay cooperative automatic repeat request ( DH-MSMR-CARQ) protocol. The paper established the Markov chain models of DH-MSMR-CARQ protocol with two different relay selections under maximum ratio combining ( MRC) and gave the state spaces respectively. Based on truncation, this paper derived analytical expressions of average transmission delay and throughput according to their respective average packet error rate and state transition probability matrix. The numerical simulation results show that the number of source nodes, packet length and the packet error rate from the best relay node to destination node are the key factors affecting the average transmission delay, and the first relay selection method has higher throughput. In addition, the DH-MSMR-CARQ protocol has higher throughput than the direct SSSR-CARQ, MSSRCARQ and MSSR-CARQ protocols in non-extreme channel environment ( the packet error rates between source nodes and relay nodes are less than 0. 8). [ABSTRACT FROM AUTHOR]

Considering resource-limited wireless communications such as satellite communications, the relevant problems of modulation and demodulation of multi-h continuous phase modulation (multi-h CPM) signals are studied. A new way of decomposition is first designed to simplify the modulation process of the multi-h CPM signals, followed by a periodic state trellis. Then, a pilot-aided quasi-coherent demodulation algorithm is proposed to detect the multi-h CPM signals according to the designed decomposition. Moreover, the multi-h CPM signals and the single-h CPM signals are evaluated and compared from the two aspects of power spectrum and bit error performance. Simulation results show that, no matter what frequency pulse is used, the multi-h CPM signals have smoother power spectrum curves than the single-h CPM signals; only with the assistance of two pilot symbols, the performance gain of the uncoded multi-h CPM system is nearly 2 dB compared with that of the uncoded single-h CPM system, and the coded multi-h CPM system can achieve performance gain of 0.1 dB to 0.25 dB more than the coded single-h CPM system at low signal-to-noise ratios (SNRs). [ABSTRACT FROM AUTHOR]

The paper studied the physical layer security problem of full-duplex relay system based on decode-and-forward. There was the direct link between the eavesdropper and legitimate users or relay in the system model, and the channel state information( CSI) between legitimate users and the relay was imperfect. By analyzing the influence of channel estimation error, average signal-to-noise ratio of eavesdropping channel and residual self-interference on the physical layer security of the relay system, it derived the expressions of end-to-end instantaneous signal-to-noise ratio of each node and secrecy outage probability under imperfect CSI. The simulation results show when the channel estimation error, the average signal-to-noise ratio of the eavesdropping channel and residual self-interference are smaller, the system security outage probability is smaller, and the system security performance is better. At high signal-to-noise ratio, the effect of residual self-interference on the security outage probability is negligible . At the same time, the full-duplex relay scheme is superior to the traditional half-duplex relay scheme . [ABSTRACT FROM AUTHOR]

Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal on Communication / Tongxin Xuebao is the property of Journal on Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the design problem of predictive transmit antenna selection (TASP) / receive antenna maximum ratio combining (MRC) wireless communication system with the minimum mean square error (MMSE) channel prediction,exact and approximate closed-forms for the average symbol error rate (ASER) of M-ary ortho-gonal and biorthogonal signals with coherent detection and TASP/MRC over Rayleigh block fading channel were de-rived by using parabolic cylinder function,the approximate expression of Gaussian Q-function and moment generat-ing function (MGF) based analysis approach respectively.Numerical and simulation results show that the theoretical analysis of the ASERs of orthogonal and biorthogonal signals is exact and the approximate closed-form for the ASER of orthogonal signals is accurate.The above exact or/and approximate closed-forms of ASER of orthogonal and biortho-gonal signals with coherent detection and TASP/MRC can be used to determine the number of antennas of transmitter and receiver and the parameters of predictor quickly,instead of the time-consuming and inefficient computer simulation.

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

By using the statistical average results of higher-order powers of Gaussian Q-function in multi-branch diversity reception with maximum ratio combining（MRC）in Rayleigh fading channel，exact closed-form for the average symbol error rate（ASER）of differentially encoded quadri-phase shift keying（DE-QPSK）using coherent detection with transmit selection combining（SC）and receive MRC（SC/MRC）in Nakagami fading channels was derived.Approximate closed-form for the ASER of DE-QPSK with SC/MRC in Nakagami fading channels was derived by using the approximate expression of Gaussian Q-function and moment generating function based analysis approach.Numerical and simulation results show that the theoretical analysis of the ASER of DE-QPSK is exact and the approximate closed-form for the ASER of DE-QPSK is accurate.The above results can be used to design SC/MRC antenna diversity systems with DE-QPSK.

Copyright of Journal of Harbin University of Science & Technology is the property of Journal of Harbin University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Power allocation of the cooperative communications was investigated， as well as an optimal power allocation of single relay system with amplify-and-forward (AF) protocol. The instantaneous symbol error rate (SER) for the AF relay system was derived first and the objective of optimization by minimizing the system error rate was defined. Secondly， the penalty factor was introduced to transform the constrained minimum bit error rate problem into an unconstrained problem and then a new objective function was established. Finally， a combination of artificial fish swarm and particle swarm optimization algorithm(AFPSO) was proposed to solve the system optimization problem. Simulation result shows that the proposed algorithm can improve the system performance and reduce the computational complexity. [ABSTRACT FROM AUTHOR]

In this paper, we compute the secrecy mutual information of Amplify-and-forward (AF) relay networks with finite alphabet input under the total power constraint. Under the assumption that the full CSI is obtained, we propose a beamforming scheme that completely null in the direction of the eavesdropper, on the other hand, we use the strategy of power control to maximize the secrecy mutual information. Besides, we study the average symbol error rate of the proposed strategy. The analysis indicates that the error floor appears in the proposed strategy at high total power. Consequently, we propose a modified scheme that appropriately enhancing the source power to cope with this problem. The modified scheme sacrifices little secrecy mutual information to achieve noteworthy improvement of the symbol error rate, and it eliminates the error floor of the proposed strategy at high total power. [ABSTRACT FROM AUTHOR]

The performance of two-way multi-relay cooperative communication system is investigated in the frequency-nonselective Rayleigh fading channels. Firstly, based on the signal transmission process of mod-el, the channel capacity is analyzed. Secondly, the outage probability closed-form upper bounder is derived by using cumulative distribution function. Furthermore, a closed-form expression of the average symbol error rate is derived for MPSK modulation, by using the moment generation function. Simulation results confirm the presented theoretical analysis, and indicate that the two-way multi-relay model outperforms the two-way single-relay model both in outage probability and average symbol error rate. [ABSTRACT FROM AUTHOR]

Existing artificial noise method adds artificial noise into the null space of legal channel to reduce the probability of being intercepted when sending confidential signal, if the antenna of eavesdropper is not less than the transmitter, it is disable. To solve this problem, the signal subspace artificial noise space-hopping method of physical-layer-security is proposed. Transmitter randomly selected the signal subspace to transmit confidential signal, and added artificial noise to the signal subspace. The legitimate receiver selects the corresponding signal subspace according to the Space-hopping pattern, and removes the artificial noise super imposed in the confidential signal using the agreed artificial noise then modulates the confidential information. The eaves dropper unknown Space-hopping pattern and the agreed artificial noise, cannot find the signal subspace and remove the artificial noise super imposed in the confidential signal so cannot avesdrop confidential information. Simulations show that legitimate receiver's SNR loss less than 3dB, and the symbol error rate of eavesdropper close to 0. 75 with QPSK modulation. [ABSTRACT FROM AUTHOR]