INTRODUCTION
In the past, adding speech recording and playbackcapability to a product meant using a digital signalprocessor or a specialized audio chip. Now, using asimplified Adaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can beadded to any PICmicro device. This application note willcover the ADPCM compression and decompressionalgorithms, performance comparison of all PICmicrodevices, and an application using a PIC16C72 microcontroller.
DEFINITION OF TERMS
step size - value of the step ....etc

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How to do adaptive delta modulation in labview ....etc

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Abstract

In this paper we consider the variation of eigenvalues and eigenvalue sums across the frequency bins of a MIMO OFDM system. In particular, we consider the changes in the ordered eigenvalues and the eigenvalue sum or page link gain, between two distinct frequency bins. The size of such changes has an important effect both on system performance and design. In addition these results have applications in other areas, including temporal variation, feedback delay and channel estimation. Novel results presented include distribution ....etc

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Reliable Adaptive Modulation and Interference Mitigation for
Mobile Radio Slow Frequency Hopping Channels

Abstract—

The Long Range Fading Prediction algorithm for
Slow Frequency Hopping (SFH) systems is proposed and demonstrated
to enable combined Adaptive Modulation and adaptive
Frequency Diversity to mitigate the effects of fading and partialband
interference. Significant performance gains are demonstrated
relative to non-adaptive methods in realistic mobile
radio SFH channels where the total ba ....etc

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I am looking for matlab code on adaptive differrential pulse code modlation. ....etc

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Prepared by:
Khaizuran Abdullah
Zahir M. Hussain


Abstract

Comparative studies on DWT-OFDM and FFTOFDM systems are presented. The model for DWT-OFDM includes zero-padding and vector transpose for transmitting the OFDM signal. MATLAB simulation commands are also described. The discrete wavelet transform-OFDM (DWT-OFDM) has to satisfy the orthonormal bases and the perfect reconstruction properties to be considered as wavelet transform. Different wavelet families have been used and compared with the conventional ....etc

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can u please send furthur information about adaptive modulation performance of wideband OFDM communications to my mail [email protected] ....etc

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By
JOSHI G



Abstract

The demand for high-speed mobile wireless communications is rapidly growing.
OFDM technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems of the near future. This work presents an investigation into methods for maximizing the spectral efficiency of Orthogonal Frequency Division Multiplexing (OFDM) systems. The current standards such as IEEE 802.11a in USA and ....etc

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