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High order modulations with multi-stream transmissions have been proposed recently as a promising feature to increase the available data rates in the upcoming releases of LTE systems. Increasing the modulation order requires additional processing capabilities in both infrastructure nodes and mobile terminals. However, most of decoding algorithms are based either on turbo processing strategies or successive...
A prototype of an enhanced QoS 802.11n circuit using a Tournament Contention Function (TCF) is presented in this article. First, the TCF developed is briefly explained. Then, a simple hardware implementation of this protocol in compliance with the 802.11n standard is proposed and evaluated.
We discuss in this paper the performance of the present Wi-Fi system in a high-speed environment where Doppler effect is taken into account. The performance is reported in both 802.11a and its future MIMO version 802.11n. Simulations are taken in use of Jakes' model in diffe??rents speeds contexts and WiFi system is found weak facing Doppler effect. In order to reduce the Doppler impact, we present...
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