Co-channel interference (CCI) is one of the most horrible obstacles for radio communications systems to increase system throughput. Adaptive arrays are well known to mitigate the performance degradation caused by CCI [1]. Especially, adaptive arrays based on minimum mean square (MMSE) criteria have been investigated intentionally because they can suppress the CCI sufficiently even if direction ...

This paper proposes a novel Space Vector Pulse width modulation (SVPWM) for sensor less control of induction motor using model reference adaptive system (MRAS). The steady state ripples in the torque are present in the conventionally used MRAS sensor less control of induction motor which utilizes normally used voltage source inverters. Also performance of the steady state speed is not as perfec...

Toll Quality Voice-32 kbit/s ADPCM MIME Sub-type Registration Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of thi...

The performance of adaptive modulation schemes that employ either n o transmission, BPSK, QPSK, 16 Square Q A M a n d 64 Square Q A M is characterised for transmissions over Rayleigh channels. T h e optimum value for the switching levels between the Axed modulation schemes is found. Th i s is achieved by ,optimising the B E R a n d throughput for wireless computer d a t a and speech systems. Us...

Adaptive Differential Pulse Code Modulation, or ADPCM, is a digital compression technique used mainly for speech compression in telecommunications. ADPCM is a waveform codec that can also be used to code other signals than speech, such as music or sound effects. ADPCM is simpler than advanced low bit-rate voice coding techniques and doesn’t require as heavy calculations, which means encoding an...

The performance of an isolated word speech recognition (IWSR) system is known to drop rapidly with increase in the degradation of the input speech. In this paper we propose a recognition scheme wh1.h adapts itself to mild degradations in speech. The scheme does not need apriori information regarding the nature and extent of noise. We suggest techniques which adaptively discriminate between nois...

Adaptive modulation techniques have been proposed to optimise Shannon's channel capacity in orthogonal frequency division multiplexing (OFDM) system. By adapting the modulation type (effectively changing the number of bits per symbol) at the transmitter end one could improve the bit error rate (BER) during transmission at designated SNR. Blind detection of the transmitted modulation type is des...

This paper analyzes the tonal behavior of an adaptive second-order sigma-delta modulator, which was developed and published by the same authors. Idle channel tones, caused by non-white quantization error, is not desirable in applications where the human ear is the end receiver. Besides their relatively small magnitude tones in the baseband, most sigma-delta modulators produce high-powered tones...

Toll Quality Voice-32 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM) MIME Sub-type Registration Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state an...

Effect of Slow Fading and Adaptive Modulation on TCP/UDP Performance of High-Speed Packet Wireless Networks