4篇
您的检索式：作者名="CAO CongZhe"
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| 1 | Enhanced frameless slotted ALOHA protocol with Markov chains analysis显示文摘In this paper, we propose a novel approach to enhance the performance of frameless slotted ALOHA(SA) protocol. We employ signature codes to help the receiver identify the packets contained in collisions, and use successive interference cancellation(SIC) for packet recovery. We model the proposed scheme as a two-state Markov model represented by a uni-partite graph. We evaluate the throughput,expected delay and average memory size of the proposed scheme, and optimize the proposed scheme to maximize the throughput. We show that the theoretical analysis matches well with simulation results.The throughput and expected delay of the proposed protocol outperform the conventional slotted ALOHA protocol significantly. | Dai JIA Zesong FEI Ming XIAO Congzhe CAO Jingming KUANG | 2018 | Science China(Information Sciences)2018，61，10： | 2 |
| 2 | Secure Transmission Scheme for Parallel Relay Channels Based on Polar Coding显示文摘This paper considers the use of polar codes to enable secure transmission over parallel relay channels.By exploiting the properties of polar codes over parallel channels, a polar encoding algorithm is designed based on Channel State Information(CSI) between the legitimate transmitter(Alice) and the legitimate receiver(Bob).Different from existing secure transmission schemes, the proposed scheme does not require CSI between Alice and the eavesdropper(Eve). The proposed scheme is proven to be reliable and shown to be capable of transmitting information securely under Amplify-and-Forward(AF) relay protocol, thereby providing security against passive and active attackers. | Ce Sun Zesong Fei Dai Jia Congzhe Cao Xinyi Wang | 2018 | Tsinghua Science and Technology2018，23，3： | 2 |
| 3 | Analysis of irregular repetition spatially-coupled slotted ALOHA显示文摘Contention-based access is a promising technology for massive and sporadic transmissions. In this paper, we propose a novel contention-based multiple access scheme, named irregular repetition spatiallycoupled slotted ALOHA(IRSC-SA), motivated by the spatial coupling and irregular repetition techniques.There are different classes of users and slots in IRSC-SA, which result in unequal protection for different users. Considering that, we derive a novel density evolution(DE) method, which deals with unequal packet protection and introduces Bayesian reasoning to analyze the throughput threshold of the proposed IRSC-SA.Theoretical analysis and simulation results show that the proposed scheme achieves better asymptotic threshold and system packet throughput performance than the conventional spatially-coupled slotted ALOHA. | Hanxiao YU Zesong FEI Congzhe CAO Ming XIAO Dai JIA Neng YE | 2019 | Science China(Information Sciences)2019，62，8： | 1 |
| 4 | An extended packetization-aware mapping algorithm for scalable video coding in finite-length fountain codes显示文摘We propose an extended packetization-aware mapping algorithm based on fountain codes to enhance video stream performance which is vulnerable to packet losses.By properly utilizing the proposed algorithm in finite-length cases,the edges connecting to a source symbol are scattered over multiple encoding packets so that the decoding probabilities are increased.Furthermore,an improved degree distribution is designed to obtain better decoding probabilities.Numerical results,it is confirmed that the proposed algorithm in finite-length cases can augment decoding probabilities and the improved degree distribution can increase peak signal-to-noise ratio(PSNR) of scalable video coding(SVC) in a hostile communication environment. | CAO CongZhe FEI ZeSong XIAO Ming HUANG GaiShi XING ChengWen KUANG JingMing | 2013 | Science China(Information Sciences)2013，56，4： | 1 |
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