دانلود رایگان مقاله لاتین زمان بندی حداکثر وزن با مدولاسیون سلسله مراتبی از سایت الزویر
عنوان فارسی مقاله:
زمان بندی حداکثر وزن با مدولاسیون سلسله مراتبی برای تاخیر کمتر
عنوان انگلیسی مقاله:
Maximum-weight scheduling with hierarchical modulation for lower delay
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
At the physical layer, superposition coding is suggested for broadcast channels to attain reliable communication with two receivers simultaneously [2]. In superposition coding, messages are layered on each other. This way, the destination with worse channel conditions can reliably decode its own message at the base layer and after decoding the message in the base layer, the destination with better channel conditions can understand its own in the enhancement layer. Hierarchical modulation (also known as embedded, asymmetrical, non-uniform or multi-resolution modulation) is a practical way of applying superposition coding [3–6]. In practice, hierarchical modulation is used for video transmission in the digital video broadcasting-terrestrial (DVB-T) standard [7], but it is not yet implemented in cellular or ad hoc networks. In hierarchical modulation, channel code, assigned power level, signal constellation type, constellation size and symbol mapping can be chosen independently for each layer to control the probability of error at each layer separately. Allowing non-uniform spacing between signal points on the signal constellation, hierarchical modulation protects base layer bits more than enhancement layer bits. While the user with better channel conditions can reliably demodulate both base and enhancement layer bits, the user with poor channel conditions can only recover the base layer. The achievable rate region of the Gaussian broadcast channel with practical constellations and channel coding schemes are investigated in [8,9]. In [10–12], the authors use hierarchical constellations to transmit to two users simultaneously. The proposed adaptive modulation method is opportunistic in the sense that a second user is superposed on the first, only if the first user can transmit with the already assigned rate in the presence of the interlayer interference caused by the second user. This way, channel access probability is almost doubled without any loss in spectral efficiency.
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کلمات کلیدی:
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