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Practical digital communication systems are designed to operate well in typical conditions, where the bit/packet error rates are below a certain level. In packet-based systems, if Bob has a data to send to Alice then Bob first transmits a preamble/packet header followed by data. A necessary condition to receive the data correctly is to receive the packet header and therefore headers use a more robust...
We propose a generic algorithm called SFT (Selective Frame Transmission), which is applicable to both pre-encoded and live AV (Audio Video) content streaming, and endeavors to ensure timely delivery of frames to the receiver by selectively dropping certain frames at the transmitter which do not satisfy the end-to-end latency bound. The key idea of SFT is that the end-to-end latency bound includes...
Wireless network coding has the potential to enhance the capacity of wireless mesh networks (WMNs). However, most of the work considering the practical deployment of network coding in WMNs considers only IEEE 802.11 based medium access control (MAC) layers. The recent emergence of sophisticated MAC standards supporting WMNs (e.g. IEEE 802.16) make it necessary to view the deployment issues for network...
In this paper, we provide a saturation throughput analysis of the IEEE 802.11 protocol at the data link layer by including the impact of both transmission channel and capture effects in Rayleigh fading environment. Impacts of both non-ideal channel and capture effects, specially in an environment of high interference, become important in terms of the actual observed throughput. As far as the 4-way...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for...
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