Throughput Improvement of an AMQAM Scheme by using New Switching Thresholds over Nakagami-m Fading Channels

  • Lee, Youngkou (Dept. of Information and Communications, KJIST) ;
  • Park, Sungsoo (Dept. of Information and Communications, KJIST) ;
  • Insoo Koo (Dept. of Information and Communications, KJIST) ;
  • Kim, Seung-Geun (Dept. of Information and Communications, KJIST) ;
  • Kim, Kiseon (Dept. of Information and Communications, KJIST)
  • Published : 2002.07.01

Abstract

In this paper, we investigate the throughput improvement of an adaptive M-ary quadrature modulation (AMQAM) scheme by using new switching thresh-olds over slow frequency nonselective Nakagami-m fading channels. The new switching thresholds are obtained by using the approximated BER expressions with complimentary error functions for each modulation scheme given in AWGN channels. By using the new switching thresholds, we can improve the maximum system throughput. For example, we get the maximum throughput improvement about 0.32 when tile target BER is 10$\^$-3/ and the fading figure m = 3.

Keywords