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Articles by Zongkai Yang
Total Records ( 5 ) for Zongkai Yang
  Zongkai Yang , Ahmed Muthana , M. Nadhim , Abdul-Karim A-R. Kadhim and Zongkai Yang
  It has been shown that Discrete Multi-Tone (DMT) modulation is an attractive technique for copper wire access technology ( Asymmetric and Very-high-rate Digital Subscriber Line). Discrete Wavelet Multi-Tone (DWMT) is a variant high-performance transmission technique, which is based on the application of wavelet filter bank. However, it was shown in the work that complex wavelet system is very attractive for DWMT. It is usually implemented using parallel filter bank, which have strict design constraints. Instead, a new design method, based on wavelet packet modulation, was proposed. The performances of DWMT system and the standard DMT system were examined in ADSL and VDSL environments.
  Weimin Lang , Zongkai Yang , Bing Peng and Yunmeng Tan
  In this paper, we propose an identity-based ring signature scheme from bilinear pairings which fulfils perfectly the security requirements of ring signature. Our scheme can be considered as a simplified group signature with no group setup procedure, and no revocation mechanism against signer`s anonymity, thus signer`s privacy is guaranteed. As compared with Zhang`s scheme, our scheme is a computational efficiency improvement for signature verification because the computational cost of bilinear pairings required is reduced from O(n) to O(1).
  Zongkai Yang , Samba Sesay , Zhen Fan and Jianhua He
  In Mobile Ad hoc Wireless Network (MANET), collecting reliable global topology information is prohibitive. Thus without prior knowledge of network topology, Broadcasting provides an indispensable means of communication in ad hoc networks. However, as radio signals are likely to overlap with others in a geographical area, straightforward broadcasting by flooding usually result in redundant retransmission, contention, and collision, referred to as broadcast storm problem (Ni et al., 1999). A number of routing protocols have been put forward recently to alleviate broadcast storm problem. But all of them either lack reachability and or involves high computational overhead. This paper presents a Gradient Broadcasting Protocol that provides an alternate and improved method of broadcasting with reduced retransmission, high reachability, and low power and bandwidth consumption as shown by the simulation results.
  Samba Sesay , Zongkai Yang and Jianhua He
  This paper presents a coherent survey on ad hoc wireless networks, with the intent of serving as a quick reference to the current research issues in ad hoc networking. It starts with a background on the origin and development stages of ad hoc network, then summaries the characteristics, capabilities, applications and design constraints of ad hoc network fully distinguishing it from traditional networks. The paper discuses a broad range of research issues such as Routing, Medium Access, Multicasting, Quality of service, TCP performance, Energy, Security and Bluetooth, outlining the major challenges which have to be solved before widespread deployment of the technology is possible. Through this survey it would be seen that Ad hoc Networking presence an interesting research area inheriting the problems of wireless and mobile communications in their most difficult form.
  Samba Sesay , Zongkai Yang , Biao Qi and Jianhua He
  Mobile Ad hoc-networking (MANET) is becoming increasingly important in today’s world and a number of protocols have been developed for them. However a comparison between them is lacking to help determine an optimal one. This study addresses this issue by comparing the relative performance of four key Ad hoc routing protocols; Destination-sequenced distance vector (DSDV), Temporally ordered routing algorithm (TORA), Dynamic source routing (DSR) and Ad hoc on-demand distance vector (AODV). This study subjected the protocols to identical loads and environmental conditions and evaluate their relative performance with respect to end-to-end throughput and delay, control packet overhead and route acquisition time. From the detailed simulation results and analysis of presented, an appropriate choice of routing protocol can be made for given network context and goal.
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