IEEE 802.15.4 Performance with Wi-Fi Interference

2014 ◽  
Vol 526 ◽  
pp. 330-335
Author(s):  
Fu Qiang Wang ◽  
Xiao Ming Wu ◽  
Yong Pang ◽  
Yan Liang ◽  
Yi Fan Hu
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Real Life ◽  
Energy Detection ◽  
Performance Measure ◽  
The Other ◽  
Ism Band ◽  
Close Frequency ◽  
Coexistence Issues

This The IEEE 802.15.4 devices are proposed to operate in the 2.4 GHz industrial, scientific and medical (ISM) band. The other devices that use IEEE 802.11 b, g and n share the same frequency band. The interference caused by these technologies can degrade the performance of an IEEE 802.15.4 based wireless network. In this paper we study such degrading effects on a network equipped with IEEE 802.15.4 devices that is exposed to interference in turn with IEEE 802.11 b, g and n. The performance measure in this paper is the link Packet Receive Rate (PRR). Measurements are performed with real-life equipment, in order to quantify coexistence issues. We test all 16 channels of IEEE 802.15.4 in 2.4G band and the results show the decrease of PRR when suffering in close frequency with IEEE 802.11. The connection between energy detection and PRR is also exhibited in this paper.

scholarly journals Experimental Validation of a Coexistence Model of IEEE 802.15.4 and IEEE 802.11b/g Networks

2010 ◽  
Vol 6 (1) ◽  
pp. 581081 ◽  
Author(s):  
Wei Yuan ◽  
Xiangyu Wang ◽  
Jean-Paul M. G. Linnartz ◽  
Ignas G. M. M. Niemegeers
Keyword(s):  
Experimental Validation ◽  
Ieee 802.15.4 ◽  
Local Area Networks ◽  
Real Life ◽  
Local Area ◽  
Wireless Local Area Networks ◽  
Wireless Sensor ◽  
Ieee 802.11B ◽  
Ism Band ◽  
Coexistence Issues

As IEEE 802.15.4 Wireless Sensor Networks (WSNs) and IEEE 802.11b/g Wireless Local Area Networks (WLANs) are often collocated, coexistence issues arise as these networks share the same 2.4 GHz Industrial, Scientific, and Medical (ISM) band. Consequently, their performance may degrade. We have proposed a coexistence model of IEEE 802.15.4 and IEEE 802.11b/g networks, which addresses their coexistence behavior and explains their coexistence performance. As an extension of the previous work, a compact testbed was developed and experiments on the coexistence issues between these networks were conducted. The experiments not only validated the theoretical model but also provided more information and insights about the coexistence issues in the real-life environment.

scholarly journals The Integration Of IEEE 802.11 (WLAN) With RFID Systems in ISM (2.45 GHz) Frequency Band Environment Using Framed Slotted ALOHA And IEEE 802.15.4

2021 ◽  
Author(s):  
Haleh Khojasteh
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Access Point ◽  
Collision Probability ◽  
Time Sharing ◽  
Slotted Aloha ◽  
Framed Slotted Aloha ◽  
Ieee 802.15.4 Standard

In this thesis, we attempt to solve the problem of WLAN/RFID coexistence and integration in frequency band of GHz or ISM band. Our solution to this problem is to allow the WLAN access and RFID access in a time-sharing manner by making the WLAN Access Point aware of the RFID neighbor-network at MAC layer. The time-sharing function is implemented using IEEE 802.11 PCF mechanism. RFID network is implemented using two different standards. The first one is Framed Slotted Aloha standard and the second one is IEEE 802.15.4 standard. We have simulated both models using Artifex simulator and compared their performance using some performance metrics like collision probability and average number of collision in each superframe. It is shown that IEEE 802.15.4 based model outperforms the Framed Slotted Aloha based model.

scholarly journals The Integration Of IEEE 802.11 (WLAN) With RFID Systems in ISM (2.45 GHz) Frequency Band Environment Using Framed Slotted ALOHA And IEEE 802.15.4

2021 ◽  
Author(s):  
Haleh Khojasteh
Keyword(s):  
Ieee 802.11 ◽  
Frequency Band ◽  
Ieee 802.15.4 ◽  
Performance Metrics ◽  
Access Point ◽  
Collision Probability ◽  
Time Sharing ◽  
Slotted Aloha ◽  
Framed Slotted Aloha ◽  
Ieee 802.15.4 Standard

In this thesis, we attempt to solve the problem of WLAN/RFID coexistence and integration in frequency band of GHz or ISM band. Our solution to this problem is to allow the WLAN access and RFID access in a time-sharing manner by making the WLAN Access Point aware of the RFID neighbor-network at MAC layer. The time-sharing function is implemented using IEEE 802.11 PCF mechanism. RFID network is implemented using two different standards. The first one is Framed Slotted Aloha standard and the second one is IEEE 802.15.4 standard. We have simulated both models using Artifex simulator and compared their performance using some performance metrics like collision probability and average number of collision in each superframe. It is shown that IEEE 802.15.4 based model outperforms the Framed Slotted Aloha based model.

Co-Existence of WLAN and WPAN Communication Systems

2011 ◽  
pp. 322-331
Author(s):  
Khaled Shuaib ◽  
Mohamed Boulmalf
Keyword(s):  
Ieee 802.11 ◽  
Communication Systems ◽  
Ieee 802.15.4 ◽  
Radio Channel ◽  
Ieee 802.11B ◽  
Ism Band ◽  
Channel Interference ◽  
The Impact

Recently applications and technologies utilizing the free industrial, scientific, and medical (ISM) band have grown exponentially. Mainly there are three dominant technologies operating at the ISM 2.4 GHz band, IEEE 802.11 b/g, Bluetooth and IEEE 802.15.4 or Zigbee. With the diverse deployment and broad range of applications running over such technologies, it is inevitable that radio channel interference between devices utilizing such technologies exist. In this chapter we focus on co-existence issues between such technologies and on the quantification of the impact of Bluetooth on IEEE 802.11b/g.

scholarly journals COEXISTENCE OF STANDARDIZED WIRELESS SYSTEMS IN THE 2.4 GHZ-ISM-BAND

2014 ◽  
pp. 5-11
Author(s):  
Axel Sikora ◽  
Voicu F. Groza
Keyword(s):  
Wireless Networks ◽  
Bandwidth Allocation ◽  
Short Range ◽  
Real Life ◽  
Wireless Systems ◽  
Resource Planning ◽  
Data Networks ◽  
Frequency Bands ◽  
Ism Band ◽  
Coexistence Issues

Wireless systems continue to rapidly gain popularity. This is extremely true for data networks in the local and personal area, which are called WLAN and WPAN, respectively. However, most of those systems are working in the license-free industrial scientific medical (ISM) frequency bands, where neither resource planning nor bandwidth allocation can be guaranteed. To date, the most widespread systems in the 2.4 GHz ISM band are IEEE802.11 and Bluetooth, with ZigBee and IEEE802.15.4 as upcoming standards for short range wireless networks. In this paper we examine the mutual effects of these different communication standards. Measurements are performed with real-life equipment, in order to quantify coexistence issues.

Comments on the Market Crash: Six Months After

1988 ◽  
Vol 2 (3) ◽  
pp. 45-50 ◽  
Author(s):  
Hayne Leland ◽  
Mark Rubinstein
Keyword(s):  
Standard Model ◽  
Real Life ◽  
The Other ◽  
Financial Equilibrium ◽  
The Standard Model ◽  
Trading Mechanisms

Six months after the market crash of October 1987, we are still sifting through the debris searching for its cause. Two theories of the crash sound plausible -- one based on a market panic and the other based on large trader transactions -- though there is other evidence that is difficult to reconcile. If we are to believe the market panic theory or the Brady Commission's theory that the crash was primarily caused by a few large traders, we must strongly reject the standard model. We need to build models of financial equilibrium which are more sensitive to real life trading mechanisms, which account more realistically for the formation of expectations, and which recognize that, at any one time, there is a limited pool of investors available with the ability to evaluate stocks and take appropriate action in the market.

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