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In this paper, we propose an improved timing estimation method for orthogonal frequency division multiplexing (OFDM) systems. The proposed preamble-aided method is independent of the preamble structure and is based on taking advantage of the whole products available from a given preamble for its correlation. Capable of having an extended correlation length far beyond those used by the previous methods,...
Orthogonal frequency division multiplexing (OFDM) systems are more sensitive to timing and frequency offsets than single carrier systems. This paper presents a method of joint time and frequency synchronization for OFDM systems. The synchronization technique is examined in both AWGN and multipath fading environments. Compared with conventional schemes, the proposed schemes can achieve smaller mean...
In this paper a novel timing Synchronization method for Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. This method is based on the transmission of a training symbol at the transmitter and using symmetrical correlation between some parts of this training symbol in receiver. The proposed method has an impulse-like timing metric and makes it possible to estimate the correct timing...
Due to the importance of congestion in networks, we look for a method that can reduce the network congestion, in recent years considerable efforts have focus on the call admission control that provide the desired QoS but cannot reduce the network congestion, so in this paper we introduce a new scheme that add an additional dimension (dynamic pricing) to CAC in order to reduce congestion. Dynamic pricing...
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