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• W1569334507 abstract "Data transmissions in Wireless Local Area Networks (WLANs) often suffer front bit errors that arise front the notoriously complex and time-varying signal propagation characteristics of the wireless medium. A number of physical factors such as attenuation and multi-path are prevalent indoors and can lead to high bit-error rates at the link layer. These in turn lead to packet losses, low throughput, and higher and more variable packet latencies observed at higher layers, degrading the performance of many delay-sensitive and traffic-intensive wireless applications such as games, file-sharing, voice-over-IP, and streaming video. We use the notion of path diversity to develop an approach that improves data delivery efficiency and throughput in presence of transmission errors. Path diversity relies on multiple access points (APs) covering a given area or multiple radios on the user's device (or both). The hypothesis underlying this system is as follows: because frame errors are often path-dependent (e.g., due to multi-path fading), location-dependent (e.g., clue to noise), and statistically independent between different transmitting radios, transmissions are likely to succeed from at least one of the available transmitters (transmit diversity). Likewise, multiple radios that all receive versions of the same transmission may together be able to correctly recover a frame, even when any given individual radio is not (receive diversity). Using these principles, we design and implement the Multi-Radio Diversity (MRD) system, which leverages the properties of path diversity at the transmitter and receiver to reduce frame loss rates in the link-layer, leading to increased throughput and packet delivery efficiency. We introduce several techniques that make path selection, retransmission, and rate adaptation work efficiently in a MRD system based on the 802.11 MAC. We used commodity PCs and wireless interfaces to build a MRD system and conducted a wide range of indoor experiments. Our experiments measured throughput gains up to three times over conventional schemes without consuming much extra wireless bandwidth. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.)" @default.
• W1569334507 created "2016-06-24" @default.
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• W1569334507 date "2006-01-01" @default.
• W1569334507 modified "2023-10-18" @default.
• W1569334507 title "Improving packet delivery efficiency using multi-radio diversity in wireless lans" @default.
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