نتایج جستجو برای: over modulation

تعداد نتایج: 1272134  

Journal: :IEEE Communications Letters 2023

Guessing random additive noise decoding (GRAND) is a noise-centric method, which suitable for low-latency communications, as it supports error correction codes that generate short codewords. GRAND estimates transmitted codewords by guessing the patterns altered them during transmission. The process requires testing of are arranged in increasing order Hamming weight. This approach fitting binary...

In this paper a feature-based modulation classification algorithm is developed for discriminating PSK signals. The candidate modulation types are assumed to be QPSK, OQPSK, π/4 DQOSK and 8PSK. The proposed method applies an 8PSK baseband demodulator in order to extract required features from observed symbols. The received signal with unknown modulation type is demodulated by an 8PSK demodulator...

2012
Puneet Chandra Srivastava R. K. Singh

Intensity modulation with direct modulation (IM/DD) favors low duty cycle modulation schemes such as pulse position modulation (PPM) and multiple PPM(MPPM).In this paper,the channel model over IM/DD is introduced. Then, a brief summary is given about some of the modulation techniques used in this area. Finally, some of the pulse position based coded modulation techniques are rewiewed.

Journal: :IEICE Electronic Express 2013
Chun Wei Lin Bing-Shiun Hsieh

This paper presents the technique to dynamically enhance the power efficiency of PWM class-D amplifier over a wide range of modulation indexes. The power stage of amplifier is segmented into several small stages and selectively enabled according to the power demand (i.e. modulation indexes). The capability of power delivery is dynamically adjusted to minimize the power loss in case of different...

عبدی‌پور, * عبدالعلی, محمدی, عباس , کشاورزی, محمد رضا ,

Abstract The effect of IQ imbalance on adaptive MQAM modulation in MIMO systems with direct conversion receivers is investigated in this paper. A continues power, discrete rate adaptive modulation scheme in using MIMO system with perfect channel information in both transmitter and receiver is considered. The selected adaptation mechanism changes the transmit power and transmit constellation s...

Journal: :iranian journal of basic medical sciences 0
maryam mousavinezhad-moghaddam department of physiology, biology division, faculty of sciences, ferdowsi university of mashhad, mashhad, iran abbas ali amin department of immunology, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran houshang rafatpanah immunology research centre, bu-ali research institute, mashhad university of medical sciences, mashhad, iran seyed abdol rahim rezaee inflammation and inflammatory diseases research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran

the physiologic function of the immune system is defense against infectious microbes and internal tumour cells, therefore, need to have precise modulatory mechanisms to maintain the body homeostasis. the mammalian cellular cd200 (ox2)/cd200r interaction is one of such modulatory mechanisms in which myeloid and lymphoid cells are regulated. cd200 and cd200r molecules are membrane proteins that t...

2000
Mohammed Zafar Ali Khan B. Sundar Rajan

The diversity order is crucial for the performance of communication systems over Fading Channels. It has been shown by Zehavi that the diversity and hence performance of coded modulation over fading channels can be improved by bitwise interleaving at the encoder output, and by using an appropriate soft decision metric as an input t o the Viterbi decoder. A related approach is coordinate interle...

2004
Michael Wood

Elementary information about convolutional codes over finite fields is introduced, and various motivations for extension to convolutional codes over finite rings are discussed. The recent primary motivation is found to be for use over phase modulation signals. Such ring codes enjoy the special property of phase weight equal to phase distance equal to the squared Euclidean distance between phase...

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