Please use this identifier to cite or link to this item: https://dr.ddn.upes.ac.in//xmlui/handle/123456789/2586
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dc.contributor.authorRavindranath, N.S.-
dc.date.accessioned2019-01-18T07:40:36Z-
dc.date.available2019-01-18T07:40:36Z-
dc.date.issued2017-03-
dc.identifier.urihttp://hdl.handle.net/123456789/2586-
dc.description.abstractThis thesis deals with investigating performance issues in IEEE 802.11ac WLANs. IEEE 802.11ac is a Very High Throughput (VHT) WLAN standard that is designed to achieve data rates in the order of 7 Gbps in 5 GHz range of frequency. Firstly, problems faced in legacy LANS are discussed in detail. QoS and interference have been identified as the major limiting factors in WLANs. A study is undertaken with respect to the concepts underlying the 802.11n standard (prior to 802.11ac) followed by the enhancements in 802.11ac in the MAC and PHY layers. NS3 simulations show the superior performance of 802.11ac standard with respect to 802.11n. Features verified are spatial streams, channel bonding, guard interval and MCS while performance is measured with parameters such as jitter, throughput and delay. It is seen that these features contribute to enhanced throughput and reduced delay. Next, the 802.11ac performance with rate adaptation (RA) algorithms is simulated in NS3. Performance is measured for both 802.11ac and 802.11n WLANs with throughput versus SNR in the presence of parameters such as channel bonding and different spatial streams. A comparison is done to study the effect of Ideal Wi-Fi and Minstrel RA algorithms in 802.11n and 802.11ac. With Ideal RA, both 11ac and 11n perform consistently. With Minstrel, both 11ac and 11n behave similarly at 20 MHz CBW, but for 11ac, there is inconsistency at all other BWs and number of SSs. For 11ac, both Ideal and Minstrel are suitable at 20MHz and 40 MHz, but Minstrel is not recommended for 80 and 160 MHz CBWs. It is to be noted that 802.11ac standard has not yet defined rate adaptation mechanisms.en_US
dc.language.isoenen_US
dc.publisherUPES, Dehradunen_US
dc.subjectComputer Scienceen_US
dc.subjectCellular Networksen_US
dc.titleInvestigations in the areas of performance improvement in 802.11ac (draft) wlan standard over existing wlan and cellular networksen_US
dc.typeThesisen_US
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01_title.pdf48.77 kBAdobe PDFView/Open
02_acknowledgement.pdf95.66 kBAdobe PDFView/Open
03_declaration.pdf20.07 kBAdobe PDFView/Open
04_certificate.pdf71.35 kBAdobe PDFView/Open
05_contents.pdf460.35 kBAdobe PDFView/Open
06_executive summary.pdf314.17 kBAdobe PDFView/Open
07_list of abbreviations.pdf160.75 kBAdobe PDFView/Open
08_list of figures.pdf508.41 kBAdobe PDFView/Open
09_list of tables.pdf28.41 kBAdobe PDFView/Open
10_chapter1.pdf312.71 kBAdobe PDFView/Open
11_chapter2.pdf2.01 MBAdobe PDFView/Open
12_chapter3.pdf6.46 MBAdobe PDFView/Open
13_chapter4.pdf9.21 MBAdobe PDFView/Open
14_chapter5.pdf2.38 MBAdobe PDFView/Open
15_chapter6.pdf81.12 kBAdobe PDFView/Open
16_appendices.pdf5.13 MBAdobe PDFView/Open
17_references.pdf960.13 kBAdobe PDFView/Open


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