Volume 1, Issue 4, September 2011

Studies of Routing Algorithm in Ad-Hoc Wireless Networks [Download Paper]
Sanjeev K. Srivastava

Abstract - Mobile ad-hoc networks represent complex distributed systems that comprise wireless mobile nodes that can freely and dynamically self organize into arbitrary and temporary “Ad-Hoc” network topologies allowing people and devices to seamlessly inter network  in  areas  with  pre-existing  communication  infrastructure.  The  new  technologies  e.g.  WLAN  (802.11),  Blue  tooth  and Hyperlan  are  helping  ad-hoc  networks  to  be  deployed  easily.  To  cope  with  the  self-organizing,  dynamic,  volatile,  peer-to-peer communication environment, most of the main functionalities of networking protocols need to be re-designed. The main aim of ad-hoc networks  will  be to provide one-hop transmission service for  reliable end-to-end delivery.  Once a user is located, routing and forwarding  algorithms  must  be  provided  to  route  information  through  ad-hoc  networks.  The  highly  dynamic  nature  of  ad-hoc networks  results  in  frequent  and  unpredictable  changes  of  network  topologies.  This  results  into  complex  routing  procedures.  To understand  the  ad-hoc  networks,  a  simulation  model  for  ad-hoc  networks  is  developed.  The  performance  of  the  DSR  (Dynamic Source Routing) protocol is evaluated. This dissertation work presents the performance evaluation of routing algorithms for ad-hoc networks.  There  is  variety  of  routing  algorithms  practiced  for  wired  networks  (e.g.  Internet).    The  work  studies  first  the  present theories and practices  for routing. Secondly the details of ad-hoc networks are studied. During the studies on ad-hoc networks, it
was felt that the routing procedures had to be evaluated for such type of the network. A detailed study of various routing algorithms is presented. The results reveal that low mobility, high density networks results into excellent performance.


An Active Recursive RF Filter Design in 0.35
µm   BiCMOS  [Download Paper]
Seyed Reza Hadian Amrei, Masoud Sabaghi, Bahare Rezaie, Monirehsadat Miri and Maziyar Niyakan Lahiji

Abstract—paper is proposed an active recursive filter with BiCMOS technology. A test circuit was designed in a 0.35 µm SiGe BiCMOS  technology  with  ADS2008  (Advanced  design  system)  .In  simulations,  the  feasibility  of  this  type  of  filter  was demonstrated  and  reasonably  good  performance  was  obtained..  Gain  and  Q-value  are  tunable  in  a  wide  range.  A  center frequency is 2.5GHz which  S21=14.227dB   ,S12=-58.865.Simulations shows a center frequency tuning  range from 1-4GHz.In this Design used two impedance  matching , active and passive. Results show the active impedance matching is better result.