کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
449466 1443226 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adaptive digital phase modulation schemes using transition-initiated phase acceleration
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
Adaptive digital phase modulation schemes using transition-initiated phase acceleration
چکیده انگلیسی

Link adaptation (LA) schemes, where signal transmission features, such as, modulation, coding rate, etc. are dynamically selected based on the feedback information from receiver regarding the channel condition, have recently emerged as powerful tools for increasing data rate and spectral efficiency of wireless networks. In this paper, we examine an adaptive modulation scheme for LA, based on digital phase-modulation techniques, employing a novel phase-shifting scheme. In the proposed technique, the abrupt phase shift of carrier waveform, required after each data transition, is realized by incrementing the frequency of the voltage-controlled oscillator (VCO) for a short duration, immediately following the data transition. The momentary increase in VCO frequency is realized by feeding the VCO with narrow control pulses, derived from the baseband data stream using a simple supporting circuit. The proposed technique can be used for very large scale integration (VLSI) of adaptive modulation schemes, and one such candidate scheme has been designed for VLSI implementation with triple options of binary phase-shift keying (BPSK), quadrature PSK (QPSK), and quadrature amplitude modulation (QAM).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: AEU - International Journal of Electronics and Communications - Volume 62, Issue 10, 1 November 2008, Pages 740–753
نویسندگان
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