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TCP's performance significantly degrades in multi-hop wireless networks because TCP's retransmission timeouts (RTOs) are frequently triggered regardless of congestion due to sudden delay, and wireless transmission errors. The RTOs caused by wireless errors lead to TCP's unnecessary behaviors such as reducing sharply its sending rate and increasing exponentially its back-off value even when the network...
The expansion of wireless network has been a very attractive area of research. Many researches focus on the performance of TCP over wireless environment. This paper presents the simulation analysis of rate-based pacing TCP with the delayed acknowledgement enable and disable strategies in the wireless multi-hop network. We find out how good the delayed acknowledgement (ACK) strategy affects rate-based...
In this paper the performance improvement of wireless networks caused by chirp spread spectrum (CSS) as PHY is addressed. Firstly, the bit error rate function is firstly derived theoretically. Then an OPNET modulation curve is created through EMA (external model access) programming using the BER result. By doing this, CSS is introduced into OPNET as an alternate modulation method. Furthermore, simulations...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
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