Abstract
Optimal multihop routing in ad hoc networks requires the exchange of control messages at the MAC and network layer in order to set up the (centralized) optimization problem. Distributed opportunistic space-time collaboration (OST) is a valid alternative that avoids this drawback by enabling opportunistic cooperation with the source at the physical layer. In this paper, the performance of OST is investigated. It is shown analytically that opportunistic collaboration outperforms (centralized) optimal multihop in case spatial reuse (i.e., the simultaneous transmission of more than one data stream) is not allowed by the transmission protocol. Conversely, in case spatial reuse is possible, the relative performance between the two protocols has to be studied case by case in terms of the corresponding capacity regions, given the topology and the physical parameters of network at hand. Simulation results confirm that opportunistic collaborative communication is a promising paradigm for wireless ad hoc networks that deserves further investigation.
Highlights
The emergence of novel wireless services, such as meshbased wireless LANs and sensor networks, is causing a shift of the interest of the communications community from infrastructure-based wireless networks to ad hoc wireless networks
The works reported above, and the literature stemmed from these references, concentrate on MH and fail to account for one of the most promising wireless transmission technologies, namely, cooperation
An attempt in this direction was made in [4] where the capacity region of an ad hoc network with single-relay amplify-andForward (AF) transmission was studied
Summary
The emergence of novel wireless services, such as meshbased wireless LANs and sensor networks, is causing a shift of the interest of the communications community from infrastructure-based wireless networks to ad hoc wireless networks. The works reported above, and the literature stemmed from these references, concentrate on MH and fail to account for one of the most promising wireless transmission technologies, namely, cooperation (see, e.g., [3]) An attempt in this direction was made in [4] where the capacity region of an ad hoc network with single-relay amplify-andForward (AF) transmission was studied. This paper studies the performance of an ad hoc network under the collaborative space-time coding scheme investigated in [6] (The words “cooperation” and “collaboration” will be used interchangeably throughout the paper.) According to this strategy, originally presented in the context of single-link relayed transmission, cooperation with a transmitting source occurs opportunistically, that is, whenever an idle node is able to decode the transmitted signal before the intended destination.
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