When adaptive modulation is used to counter short-term fading in mobile radio channels,
signaling delays create problems with outdated channel state information. The use of …

The idea of using knowledge of the current channel fading values to optimize the transmitted
signal in wireless communication systems has attracted substantial research attention …

Presented here is an approach to analyzing the effect of imperfect channel estimation on
adaptive modulation. The sensitivity of the main performance parameters to short-term and …

We examine adaptive modulation schemes for flat-fading channels where the data rate,
transmit power, and instantaneous BER are varied to maximize spectral efficiency, subject to …

Adaptive transmission methods can potentially aid the achievement of high data rates
required for mobile radio multimedia services. To realize this potential, the transmitter needs …

Adaptive coded modulation (ACM) is a promising tool for increasing the spectral efficiency of
time-varying mobile channels while maintaining a predictable bit-error rate (BER). An …

A major disadvantage with fixed modulation (nonadaptive) on channels with varying signal-
to-noise ratio (SNR) is that the bit-error-rate (BER) probability performance is changing with …

We address the application of adaptive modulation and coding (AMC) for third-generation
(3G) wireless systems. We propose a new method for selecting the appropriate modulation …

In wireless/mobile communications, terminals adapt their rate and transmit power or, more in
general, their coding and modulation scheme, depending on the time-varying channel …

Adaptive modulation requires channel state information (CSI), which can be acquired at the
receiver by inserting pilot symbols in the transmitted signal. We first analyze the effect linear …