Abstract
In this paper, a distributed synchronization technique based on a bio-inspired algorithm is proposed for an orthogonal frequency division multiple access (OFDMA)-based wireless mesh network (WMN) with a time difference of arrival. The proposed time- and frequency-synchronization technique uses only the signals received from the neighbor nodes, by considering the effect of the propagation delay between the nodes. It achieves a fast synchronization with a relatively low computational complexity because it is operated in a distributed manner, not requiring any feedback channel for the compensation of the propagation delays. In addition, a self-organization scheme that can be effectively used to construct 1-hop neighbor nodes is proposed for an OFDMA-based WMN with a large number of nodes. The performance of the proposed technique is evaluated with regard to the convergence property and synchronization success probability using a computer simulation.
Highlights
Wireless mesh networks (WMNs) based on orthogonal frequency division multiple access (OFDMA)have been viewed with considerable interest because they can increase the data rates and flexibility of resource allocation while avoiding the interference between multichannels [1]
In this paper, distributed time- and frequency-synchronization techniques based on a bio-inspired algorithm are proposed for nodes in an OFDMA-based WMN with a time difference of arrival (TDoA)
The performance of the proposed distributed time-synchronization technique for an OFDMA-based WMN with TDoAs is evaluated by a simulation
Summary
Wireless mesh networks (WMNs) based on orthogonal frequency division multiple access (OFDMA). WMNs with TDoAs. In [7], a timing-adjustment technique for mitigating the interference between multiple nodes in an asynchronous OFDMA mesh network using a non-iterative algorithm is proposed. Its computational complexity and latency are relatively high, as filtering operations for the forward and backward cancellations in a frame are needed to remove the ISI and ICI caused by the TDoAs. In [9,10], a distributed time- and frequency-synchronization technique for OFDMA-based WMNs is proposed by updating the FFT starting points, transmission times, and carrier frequencies according to the request messages received from the neighbor nodes. In this paper, distributed time- and frequency-synchronization techniques based on a bio-inspired algorithm are proposed for nodes in an OFDMA-based WMN with a TDoA.
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