Adaptive communication has gained attentions of almost all future communication systems, especially Orthogonal Frequency Division Multiplexing (OFDM) Systems. Adaptive nature pays in terms of rate and power while satisfying certain criteria. In fact, this is a constrained optimization problem. In this paper a similar constrained optimization problem is focused. Adaptive modulation has been a ke...

This article studies adaptive modulation for QR decomposition and successive interference cancellation receivers in multiple-input multiple-output systems over slowand fast-fading channels. In slowly fading channels, adaptive modulation schemes with finite-rate feedback under the constraints of a constant total transmit power, discrete-rate and a target bit-errorrate (BER) are proposed. Specifi...

Quadrature Amplitude Modulation is widely used modulation format in software defined radios. The major problem in QAM scheme is the recovery of a quality signal at the receiving end. The purpose of the adaptive equalizer is to remove the intersymbol interference caused by the amplitude and phase distortions of the channel. In this paper CrossCoupled Passband Adaptive Equalizer has been used for...

Adaptive modulation control (AMC) has been proposed as the next generation modulation method for increasing network performance in cellular networks. Adaptive modulation is a powerful technique to improve the spectral efficiency in wireless transmission over fading channels. Similarly, it is possible to apply the adaptive modulation technique to Call Admission Control (CAC) scheme in order to e...

Delta modulation plays a key role in data communication; the problem encountered in delta modulation is the slope over load error, which is inherent in the system. In order for the signal to have good fidelity, the slope-overload error needs to be as small as possible. Adaptive delta modulation reduces the slope over load error to a greater extent. ADM attempts to increase the dynamic range and...