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Overlay multicast is an efficient communication scheme for multipoint communication applications. This paper focuses on the transmission isolation and unbalanced load allocation problems of multi-rate multimedia transmission over embedded overlay topology where multicast receivers in the same session request service at different rates commensurate with their requirements. We propose a novel data distribution...
We investigate the matched filter design for root-raised-cosine (RRC) spectrally shaped Nyquist wavelength-division-multiplexed (WDM) systems. We show that the complexity of the receiver-side adaptive butterfly equalizer can be significantly reduced by incorporating a matched filter in the static chromatic dispersion equalizer for RRC Nyquist spectrally shaped signals. We find that the Nyquist-WDM...
Millimeter wave (mmWave) wireless personal area networks (WPANs) could provide multi-Gbps based data rate for short range communications. However, this ultra high data rate is sensitive to the co-channel interference (CCI). In this paper we use synchronization frame (sync frame) to mitigate possible interference between WPANs. Sync frames could be simply considered as the copies of beacons, which...
In this paper, we propose a feasible beamforming (BF) scheme realized in media access control (MAC) layer following the guidelines of the IEEE 802.15.3c criteria for millimeterwave 60 GHz wireless personal area networks (60 GHz WPANs). The proposed BF targets to minimize the BF set-up time and mitigates the high path loss of 60 GHz WPAN systems. It is based on designed multi-resolution codebooks,...
In this paper, we propose a solution to resolve link blockage problem in 60 GHz WPANs. Line-of-Sight (LOS) link is easily blocked by a moving person, which is concerned as one of the severe problems in 60 GHz systems. Beamforming is a feasible technique to resolve link blockage by switching the beam path from LOS link to a Non-LOS (NLOS) link. We propose and evaluate two kinds of Beam Switching (BS)...
The paper presents a feasible frequency domain pre-equalization (pre-FDE) proposal in order to reduce the number of frequency domain equalizer (FDE) in a piconet. The pre- equalization scheme based on the cross-layer design on both physical layer and MAC layer is proposed and investigated in millimeter-wave 60-GHz wireless personal area networks (WPANs). The physical structure is designed so that...
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