Cognitive modulation and coding scheme adaptation for 802.11n and 802.11af networks

Abstract

In the recent years, wireless communication experienced a huge growth, and nowadays many services are built on top of it. Much of the user demands comes from indoor environments, in which obstructions like walls and floors decrease the received signal to levels not suitable for reliable and high speed communication. Recently, national regulators worldwide started to investigate the usage of TV bands, thanks to the switch from analog to digital TV. These regulations gave birth to different wireless standards to make use of this new opportunistic spectrum. In this paper, we show how different 802.11 standard behave in indoor environment. Namely, we analyze IEEE 802.11n networks in the 2.4 GHz band, and IEEE 802.11af in the TV band, by means of theoretical analisys and simulations. Then, we design an algorithm that leverages the use of the different IEEE 802.11 amendments, by monitoring the achievable data rates with respect to the packet-error-rate, and provide simulation results on its performance on different modeled scenarios.

Dynamic Adaptive Video Streaming on Heterogeneous TVWS and Wi-Fi Networks

“…Furthermore, the idea to use more than one wireless technology, to possibly provide more bandwidth and/or increase the reliability of the connection, is an active topic and has already been investigate in literature [13]. Regarding multiple RAT technologies, it is possible to find a plethora of different proposal, ranging from offloading to TV White Space [14] [15] or [16], to content centric networking [17] [18], to cooperative streaming through smartphones [19] [20]. It is also important to note the work in [21], where the authors study different antenna patterns regarding TV White Space.…”

“…maintain connectivity. It is finally straightforward to note howFigure 2closely follows the Shannon Capacity[14] [29].…”

Understanding the present and future of cellular networks through crowdsourced traces

“…The first piece of information is readily available from the WeFi and OpenSignal traces. About the capacity of Wi-Fi networks, we assume they all use the 802.11n technologya fair assumption, given how fast this technology is being adopted -, with a per-access point aggregate throughput of 300 Mbit/s 6 [31], [32]. As far as the spare capacity available for offloading is concerned, we proceed as follows: (i) we increase today's WiFi traffic according to the Cisco projections [4], and then (ii) we subtract the traffic generated by Wi-Fi static users, which will be served by technologies to come such as mmWave.…”