High capacity hotspots based on bluetooth technology

Dunlop, J.; Amanquah, Nathan

doi:10.1049/ip-com:20045243

Cited by 7 publications

(18 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For simplicity, assume that a total of d users are active in the FH system, and at time q + l, the first user hops out of the observation band. Notice that if more than one users hop out at the same time, the method detects the model order variation more efficiently because of the obviously larger change in (8). We can write the data matrix as X = AS + W , where…”

Section: Case 2: Varying Model Ordermentioning

confidence: 99%

“…We refer to the trace of R X as the "soft-information", which is a linear function of the channel power as shown in (8).…”

Section: Case 1: Constant Model Ordermentioning

confidence: 99%

“…Recently the coexistence issue has gained increasing attention [8][9][10][11][12][13][14]. However, to date most coexistence schemes are designed for simultaneous functionality of a Bluetooth piconet and an 802.11b WLAN.…”

Section: B1 Problem Statementmentioning

confidence: 99%

“…The center control mechanism needed for collaborative schemes [8,15] confines their applications to certain situations. Power control methods [9,10] depend on the accuracy of channel sensing and can not provide much improvement if the Bluetooth device is very close to the interfering device.…”

Section: B21 Collision Avoidance For Coexistence Of Bluetooth and Wlanmentioning

confidence: 99%

“…For collaborative cases, attractive data transmission rates and throughput can be achieved by using a communication link between the Bluetooth and WLAN when they are embedded on the same device [15] or by coordinating the hop frequencies of the co-located Bluetooth devices [8].…”

Section: B21 Collision Avoidance For Coexistence Of Bluetooth and Wlanmentioning

confidence: 99%

See 4 more Smart Citations

Co-channel Interference Mitigation for Robust Coexistence of Frequency Hopped Networks

Liu¹

2006

View full text Add to dashboard Cite

Public Reporting Burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, ABSTRACTTo meet the military's increased need for rapidly deployable communication solutions, wireless networks are becoming increasingly common within tactical environments. Frequency hopping (FH) is widely used for radio transmission in such networks due to its low probability of detection/interception. With the increasing deployment, multiple networks occupying overlapping frequency bands are likely to coexist in a physical environment, especially in tactical operations, emergency situations, or dense-populated areas. Consequently co-channel interference due to frequency collisions can become a major performance limiting factor. In this project, we developed a novel interference mitigation technique based on multidimensional frequency estimation coupled with the expectation-maximization principle, which effectively resolves collisions among non-collaborative networks, thus enabling robust coexistence of multiple FH networks. To deal with possible receiver-transmitter mismatch, we also designed a low-complexity model order variation detection method. Novel multidimensional frequency estimation algorithms are also investigated. J. Li and X. Liu, "A software demonstration: collision resolution for robust coexistence of multiple wireless

show abstract

Section: Case 2: Varying Model Ordermentioning

confidence: 99%

“…We refer to the trace of R X as the "soft-information", which is a linear function of the channel power as shown in (8).…”

Section: Case 1: Constant Model Ordermentioning

confidence: 99%

Section: B1 Problem Statementmentioning

confidence: 99%

Section: B21 Collision Avoidance For Coexistence Of Bluetooth and Wlanmentioning

confidence: 99%

Section: B21 Collision Avoidance For Coexistence Of Bluetooth and Wlanmentioning

confidence: 99%

See 3 more Smart Citations

Co-channel Interference Mitigation for Robust Coexistence of Frequency Hopped Networks

Liu¹

2006

View full text Add to dashboard Cite

show abstract

Coexistence of Bluetooth Piconets and Wireless LAN

Liu

2008

Emerging Wireless LANs, Wireless PANs, and Wireless MANs

View full text Add to dashboard Cite

A Frequency Diversity Technique for Interference Mitigation in Coexisting Bluetooth and WLAN

Liu

2007

2007 IEEE International Conference on Communications

View full text Add to dashboard Cite

Co-channel interference has become an important problem with the increasing deployment of wireless networks in the unlicensed frequency band. Most existing schemes aim to avoid collisions on Bluetooth devices by modifying their hop sequences in the presence of WLAN interference. We propose a frequency diversity technique for Bluetooth, namely dual channel transmission (DCT), which reduces packet error rate (PER) due to co-channel interference when multiple Bluetooth piconets coexist with or without WLAN interference. The idea of DCT is to transmit the same packet on two distinct frequency hopped channels simultaneously and the power used in each channel is half of what would be used in single channel transmission (SCT). Since a packet is successfully received if at least one channel survives, the PER is reduced when multiple Bluetooth piconets coexist. Meanwhile, the two channels of DCT are separated by at least 22 MHz so that Bluetooth is also robust to WLAN interference. Theoretic analysis and numerical simulations show that PER for Bluetooth with DCT is significantly lower than that with SCT, when a small number of piconets coexist in the presence of WLAN interference. Comparisons to other collision avoidance mechanisms also demonstrate the effectiveness of DCT.

show abstract

High capacity hotspots based on bluetooth technology

Cited by 7 publications

References 3 publications

Co-channel Interference Mitigation for Robust Coexistence of Frequency Hopped Networks

Co-channel Interference Mitigation for Robust Coexistence of Frequency Hopped Networks

Coexistence of Bluetooth Piconets and Wireless LAN

A Frequency Diversity Technique for Interference Mitigation in Coexisting Bluetooth and WLAN

Contact Info

Product

Resources

About