Accession Number:

ADA537859

Title:

Cross-Layer Design for Robust and Scalable Video Transmission in Dynamic Wireless Environment

Descriptive Note:

Final rept. Aug 2009-Aug 2010

Corporate Author:

SAN DIEGO STATE UNIV CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s):

Report Date:

2011-02-01

Pagination or Media Count:

98.0

Abstract:

Link adaptation is a promising technique for increasing the data rate and spectral efficiency of wireless data-centric networks, without wasting power or sacrificing the bit error rate BER performance. The underlying premise of link adaptation is a real-time balancing of the link budget by dynamically adapting the transmitted power level, modulation signal constellation size, coding rate, block length symbol rate, or any combination of these parameters to take advantage of prevailing channel conditions. However, conventional adaptive modulation schemes were primarily designed for wireless networks that carry only homogeneous traffic, and thus may not be well suited for next-generation wireless multimedia networks. This report considers the problem of designing an adaptive hierarchical modulation for supporting multimedia transmission over multipath fading channels, in a cross-layer design paradigm. In particular, a method to mechanize a prioritized unicast transmission using hierarchical modulations at the physical layer in response to the disparate quality of service QoS requirements for multimedia traffic in an integrated voicedata networks is discussed.

Subject Categories:

  • Computer Systems Management and Standards
  • Miscellaneous Detection and Detectors
  • Radio Communications
  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE