Bit Loading Algorithms for Cooperative OFDM Systems
نویسندگان
چکیده
منابع مشابه
Bit Loading Algorithms for Adaptive OFDM Wireless Systems
The main goal of next generation wireless systems is to provide multimedia communication with spectrally efficient communication. Most of the up-to-date systems have been standardised to use OFDM modulation which prevents inter-symbol interference and make use of parallel subcarriers. The large number of subcarriers helps to avoid the effects of fast fading by distributing channel coded informa...
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This paper proposes a new algorithm of adaptive subcarrier allocation and bit loading for simultaneous voice and data transmission in multiuser OFDM systems. The algorithm dynamically assigns the number of subcarriers and bits/per symbol on each subcarrier for each user in a single cell. To cope with the stringent delay requirement of voice service, the subcarriers with low channel gains are as...
متن کاملa fast analytical method for optimum integer bit loading in ofdm systems
in this paper the problem of minimizing the total transmitting power subject to a fixedtotal bit rate in ofdm systems is considered. upper bounds on transmitting power and bit rate ofeach subcarrier can also be taken into account. in practice, the number of bits of each subcarriershould be integer and nonnegative. in this paper an analytical optimal solution is derived for thecase of assuming t...
متن کاملchannel estimation for mimo-ofdm systems
تخمین دقیق مشخصات کانال در سیستم های مخابراتی یک امر مهم محسوب می گردد. این امر به ویژه در کانال های بیسیم با خاصیت فرکانس گزینی و زمان گزینی شدید، چالش بزرگی است. مقالات متعدد پر از روش های مبتکرانه ای برای طراحی و آنالیز الگوریتم های تخمین کانال است که بیشتر آنها از روش های خاصی استفاده می کنند که یا دارای عملکرد خوب با پیچیدگی محاسباتی بالا هستند و یا با عملکرد نه چندان خوب پیچیدگی پایینی...
Power- and Bit-Loading Algorithms for Multitone Systems
Optimal powerand bit-loading in a multitone system requires prohibitive nonlinear programming. A useful nearoptimal solution has previously been proposed which imposes a uniform error probability distribution across the tones. In this paper, we examine two alternative nearoptimal solutions and offer a comparison with the existing solutions. The first imposes uniform power across the used tones ...
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ژورنال
عنوان ژورنال: EURASIP Journal on Wireless Communications and Networking
سال: 2007
ISSN: 1687-1499
DOI: 10.1155/2008/476797