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.

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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.