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 PUBLIC  NOTICE  Federal  Communications  Commission  445  12  th  St.,  S.  W.  Washington,  D.  C.  20554  News  Media  Information  202  /  418-  0500  Internet:  http://  www.  fcc.  gov  TTY:  1-  888-  835-  5322 
 DA:  03-  350 
 RELEASED:  February  3,  2003 


 Tutorial  on  Feature  Detection  and  Listen-  Before-  Talk  Systems 
 The  FCC’s  Office  of  Engineering  and  Technology  is  sponsoring  a  tutorial  on  “Feature  Detection  and  Listen-  Before-  Talk  Systems”  on  February  12,  2003  from  10:  00  a.  m.  to  12:  00  noon  in  the 
 Commission  Meeting  Room  (TW-  C305),  445  12  th  Street  S.  W.,  Washington,  D.  C. 
 Dr.  John  W.  Betz,  Director  of  Special  Programs  at  the  MITRE  Corporation  will  present  an  overview  of  feature  detection  and  its  possible  application  in  unlicensed  systems.  It  has  been 
 suggested  that  unlicensed  transmitters  seeking  to  share  spectrum  with  digital  television  could  use  such  feature  detectors  to  determine  if  a  channel  is  being  used,  supporting  a  “listen-  before-  talk” 
 mode  of  spectrum  sharing.  Many  digital  modulations,  such  as  DTV,  exhibit  periodic  statistics,  also  known  as  cyclostationarity.  The  periodic  statistics,  or  cyclostationary  features,  can 
 sometimes  be  detected  even  when  the  signal-  to-  noise  ratio  is  lower  than  needed  to  demodulate  the  signal.  This  presentation  describes  the  theory  and  practice  of  cyclostationary  feature 
 detection.  It  outlines  relevant  characteristics  of  cyclostationary  processes,  describes  signal  processing  approaches  for  detecting  cyclostationarity,  and  provides  performance  results. 
 Expressions  and  numerical  results  are  given  for  both  optimal  and  suboptimal  feature  detectors,  showing  detector  integration  times  needed  for  reliable  detection  at  different  input  signal-  to-  noise 
 ratios.  In  addition,  robustness  of  these  detectors  to  different  real-  world  effects  is  discussed. 
 The  public  is  invited  to  attend,  no  pre-  registration  is  needed.  For  further  information,  contact  Mike  Marcus  at  (202)  418-  2418,  mmarcus@  fcc.  gov,  or  Young  Carlson  at  (202)  418-  2427, 
 ycarlson@  fcc.  gov. 
 The  audio  portion  of  this  tutorial  will  be  broadcast  live  on  the  Internet  via  the  FCC’s  Internet  audio  broadcast  home  page  at  www.  fcc.  gov/  realaudio.  Videotape  of  the  tutorial  may  also  be 
 purchased  from  the  FCC  contractor,  CACI  Productions  Group  (formerly  InFocus),  341  Victory  Drive,  Herndon,  VA  20170,  by  calling  at  (703)  834-  1470. 


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