Digital Signal Processing Reference
In-Depth Information
6
Joint Adaptive
Transmission and
Switched Diversity
Reception
6.3 Joint Adaptive Modulation and Selection
Combining ............................................................. 157
6.4 Joint Adaptive Modulation and Switched
Combining ............................................................. 162
Hong-Chuan Yang
University of Victoria
Young-Chai Ko
Korea University
Haewoon Nam
Motorola, Inc.
Mohamed-
Slim Alouini
Texas A&M University
(TAMU)-Qatar
6.1
Introduction
Future wireless communication systems have to provide multimedia services to battery-
operated portable terminals. These systems must efficiently utilize the limited band-
width and power resources to enable high-data-rate high-reliability transmission over
wireless fading channels. Adaptive modulation and diversity combining are two of
the most important enabling techniques for future wireless communication systems.
Adaptive modulation can achieve high spectral efficiency over wireless channels [1-3].
The basic idea of adaptive modulation is to match the modulation parameters, such as
constellation size and coding rate, to the prevailing fading channel conditions while
maintaining the instantaneous error rate below a target value. Usually, the modula-
tion mode is chosen based on the comparison results of received signal strength with
Search WWH ::
Custom Search