Abstract—Because of its linearity needs, the direct implementation of the cost effective blind matched filtering technique to multiple input multiple output communication channels was not possible. In this paper we show how to perform the cost effective blind matched filtering technique for these types of communication channels assuming a two-way transmission scenario. For this reason, the blind matched filter and the adaptive filtering blocks, which are required by the so called technique, are adapted for multiple input multiple output case. Besides its structural simplicity, such adaptation does also enable the use of no higher than second order statistics of the received signal for the matched filter identification purposes. Moreover, with the use of the novel receiver, the equalization of the multiple input multiple output channel is performed alongside the matched filter identification stage.

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    Abstract—Cooperative forwarding in wireless networks has shown to yield rate and diversity gains, but it incurs energy costs borne by the cooperating nodes. In this paper we consider an incentive mechanism called Bandwidth Exchange (BE) where the nodes flexibly exchange the transmission bandwidth as a means of providing incentive for forwarding data, without increasing either the total bandwidth required or the total transmit power. The advent of cognitive radios and multicarrier systems such as Orthogonal Frequency Division Multiple Access (OFDMA) with the ability to flexibly delegate and employ a number of subcarriers makes this approach particularly appealing compared to other incentive mechanisms that are often based on abstract notions of credit and shared understanding of worth.We consider a 𝑁-node wireless network over a fading channel and use a Nash Bargaining Solution (NBS) mechanism to study the benefits of BE in terms of rate and coverage gains.We also propose two heuristic algorithms based on simple probabilistic rules for forwarding and study the tradeoffs in terms of performance among these approaches. Our results reveal that bandwidth exchange based forwarding can provide transmit power savings in OFDMA networks of at least 3dB compared to noncooperation.

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