Download or read book Bandpass Filter Performance Study for Wireless LAN Based on IEEE 802 11A Standard written by Muhammad Amir Yaacob and published by . This book was released on 2007 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Noise Amplifier Performance Study for Wireless Lan Based on IEEE 802 11A Standard written by Ros Shahizal Amri Mat Isa and published by . This book was released on 2007 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Noise Amplifier Performance Study for Wireless LAN Based on IEEE 802 11A Standard written by Eddy Yan Tuck Seng and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of IEEE 802 11a Wireless LAN Standard Over Frequency Selective Slowly Fading Nakagami Channels in a Pulsed Jamming Environment written by Irfan Kosa and published by . This book was released on 2002-12-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless local area networks (WLAN) are increasingly important in meeting the needs of the next generation broadband wireless communication systems for both commercial and military applications. In 1999, the Institute of the Electrical and Electronics Engineers (IEEE) 802.11a working group approved a standard for a 5 GHz band WLAN that supports a variable bit rate from 6 to 54 Mbps, and orthogonal frequency-division multiplexing (OFDM) was chosen because of its well-known ability to avoid multipath effects while achieving high data rates by combining a high order sub-carrier modulation with a high rate convolutional code. This thesis investigates the performance of the OFDM based IEEE. 802. 11a WLAN standard in frequency-selective, slowly fading Nakagami channels in a pulsed-noise jamming environment. Contrary to expectations, the signal-to-interference ratio (SIR) required to achieve a specific P does not monotonically decrease when the bit rate decreases. Furthermore, the results show that the performance is improved significantly by adding convolutional coding with Viterbi% decoding, and thus highlights the importance of forward error correction (FEC) coding to the performance of wireless communications systems.

Download or read book Performance of the IEEE 802 11a Wireless Lan Standard Over Frequency Selective Slow Ricean Fading Channels written by Chi-han Kao and published by . This book was released on 2002-09-01 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapidly growing demand for more reliable and higher data rate wireless communications, the Institute of the Electrical and Electronics Engineers (IEEE) 802.11 working group approved a standard for 5-GHz band, wireless local area networks (WLAN) in 1999. This standard, IEEE 802.lla, supports data rates from 6 up to 54 Mbps and uses orthogonal frequency division multiplexing (OFDM) for transmission in indoor wireless environments. This thesis examines the performance of the IEEE 802.lla standard for different combinations of sub-carrier modulation type and code rate and determines the signal-to-noise ratio required to obtain a probability of bit error P(b) of 10 sub -5. The channel is modeled as frequency-selective, slow, Ricean fading channel with additive white Gaussian noise (AWGN). Contrary to expectations, for the combinations of sub-carrier modulation type and code rate utilized by the IEEE 802. 11a standard, some of the higher data rate combinations outperform some of the lower data rate combinations. On the other hand, the results also show significant coding gain when applying convolutional coding with Viterbi decoding, and hence highlight the importance of forward error correction (FEC) coding to the performance of wireless communications systems.

Download or read book Performance Evaluation of Transceiver in IEEE 802 11a Wireless LAN Standard written by Pavan Inturi and published by . This book was released on 2003 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Receiver Performance in IEEE 802 11A Wireless Lan Standard written by Ravishankar Manishankar and published by . This book was released on 2002 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Simulation Modeling and Analysis of Wireless Local Area Networks Supporting the IEEE 802 11 Standard written by Jaikwan Joo and published by . This book was released on 1998-12-01 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research to improve the performance of the IEEE 802.11 has been ongoing since 1990. The focus of this research has investigated the use of the MAC and Physical layers for improving throughput. An adaptive MAC protocol, CATER (Code Adapts To Enhance Reliability) is based on the proposed MAC standard for wireless local area networks (WLAN)-802. 11. IEEE 802.11 uses a fixed Pseudo-Noise (PN) code for spreading the information signal, implying a fixed process gain at the receiver. When the channel degrades, IEEE 802.11 offers only retransmissions at the MAC layer to contend with the corrupted medium. However, CATER allows communicating stations to reconfigure their transceivers to use a longer PN code after a prescribed number of failed retransmissions. The longer PN code increases the process gain of the receiver and reduces the error rate. This thesis analyzes the performance of CATER as changing the factor: Start (the number of transmission before the channel is reconfigured) and Max (additional frame transmissions during reconfigure), PN code length, the number of station, and implementing Forward Error Correction (FEC). CATER provides better throughput for smaller Start and larger Max at a high bit error rate (10-3). When CATER uses a PN code length of 63, the throughput is increased by 101 percent at high bit error rate (BER). However, 802.11 is better than CATER at low BER ( 10-3).

Download or read book Performance Analysis of the IEEE 802 11A WLAN Standard Optimum and Sub Optimum Receiver in Frequency Selective Slowly Fading Nakagami Channels with AWGN and Pulsed Noise Jamming written by Christos Kalogrias and published by . This book was released on 2004-03-01 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to investigate the performance of the orthogonal frequency division multiplexing (OFDM) based IEEE 802.11a wireless local area network (WLAN) standard receiver when the signal is transmitted over a frequency selective, slow fading Nakagami channel in a worst case, pulse-noise jamming environment. The different combinations of modulation type (both binary and non-binary modulation) and convolutional code rate specified by the WLAN standard are examined. Receiver performance with Viterbi soft decision decoding (SDD) is analyzed for additive white Gaussian noise (AWGN) alone as well as for AWGN plus pulse-noise jamming (PNJ). The performance of the IEEE 802.11a WLAN standard receiver is examined both for the scenario in which perfect side information is assumed (optimum receiver) and when it is not (sub-optimum receiver). For the sub-optimum receiver scenario, the receiver performance is examined both when noise-normalization is utilized and when only linear combining is utilized. The analysis indicates that the receiver performance is severely affected by the pulse-noise jamming environment for the linear combining scenario; however, the sub-optimum receiver performance is significantly improved when noise-normalization is implemented. (2 tables, 74 figures, 11 refs.)

Download or read book Biblioth que de g ologie Pr t automatis written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Wireless LAN Signals Transmitted Over a Ricean Fading Channel in a Pulsed Noise Interference Environment written by Evaggelos Spyrou and published by . This book was released on 2004-09 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the performance of the waveforms specified by the IEEE 802.11a wireless local area network standard when the signal is transmitted over a Ricean fading channel with AWGN and pulsed noise interference. The pulsed interference is assumed to have constant average power and is either fading or nonfading. The probability of bit error is conditional on the received signal to noise power ratio, which is modeled as a random variable. The probability density function of this random variable is obtained either analytically or numerically for each modulation type, and the probability of bit error is evaluated as the expected value of the conditional probability. In one case, use is made of a new technique for the numerical inverse of the Laplace transform in order to evaluate numerically the signal to noise ratio probability density function. Due to the complexity of the analysis when both the signal and the interference are subject to Ricean fading, the analysis was simplified by assuming Ricean signal fading with Rayleigh interference fading and vice versa. The results of the analysis show that performance is affected by the degree of signal fading and also depends on the pulsed interference duty cycle. The signal to interference power ratio affects the way performance depends on these two factors.

Download or read book Wireless Technologies written by Krzysztof Iniewski and published by CRC Press. This book was released on 2017-12-19 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced concepts for wireless technologies present a vision of technology that is embedded in our surroundings and practically invisible. From established radio techniques like GSM, 802.11 or Bluetooth to more emerging technologies, such as Ultra Wide Band and smart dust motes, a common denominator for future progress is the underlying integrated circuit technology. Wireless Technologies responds to the explosive growth of standard cellular radios and radically different wireless applications by presenting new architectural and circuit solutions engineers can use to solve modern design problems. This reference addresses state-of-the art CMOS design in the context of emerging wireless applications, including 3G/4G cellular telephony, wireless sensor networks, and wireless medical application. Written by top international experts specializing in both the IC industry and academia, this carefully edited work uncovers new design opportunities in body area networks, medical implants, satellite communications, automobile radar detection, and wearable electronics. The book is divided into three sections: wireless system perspectives, chip architecture and implementation issues, and devices and technologies used to fabricate wireless integrated circuits. Contributors address key issues in the development of future silicon-based systems, such as scale of integration, ultra-low power dissipation, and the integration of heterogeneous circuit design style and processes onto one substrate. Wireless sensor network systems are now being applied in critical applications in commerce, healthcare, and security. This reference, which contains 25 practical and scientifically rigorous articles, provides the knowledge communications engineers need to design innovative methodologies at the circuit and system level.

Download or read book Performance Analysis of the IEEE 802 11 Wireless LAN Standard written by Craig Sweet and published by . This book was released on 1999 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of a Secure IEEE 802 11B Wireless Network Incorporating Personal Digital Assistants written by John Lee Camp and published by . This book was released on 2002-06-01 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research results of this thesis indicate very poor performance of a Wireless Local Area Network (WLAN) utilizing PDAs. Network throughput is adversely effected most by VPN implementation and slightly by increased file size. The client distance factor has virtually no effect on the throughput. The impact of each of these factor levels is small when compared to the magnitude of the overall mean throughput (

Download or read book Performance Analysis of Multiple Classes of Traffic in Wi Fi Networks written by Sajib Datta and published by . This book was released on 2017 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation develops analytical models for performance evaluation of WiFi networks (IEEE 802.11e/g wireless LANs) and designs admission control strategy that guarantees the quality of service (QoS) requirements of the accepted traffic. Guaranteeing QoS is a major challenge, particularly for real-time multimedia traffic such as voice and video. The QoS measures of interest are throughput, delay, collision probability, and packet loss probability. Our analytical models accurately capture the complexity of multiple classes of traffic in Wi-Fi networks; we also attain several valuable insights about the performance of IEEE 802.11 WLANs. Our study is based on the infrastructure wireless local area networks (WLANs) setting, in which mobile stations (STAs) access a high speed LAN (e.g., Eethernet) via an access point (AP). After deriving analytical models for interactive voice calls and video-conferencing traffic, we extend this model to include transport control protocol (TCP) for file downloads. Our model includes downlink video streaming traffic. We estimate the maximum number of voice calls that can be supported with and without TCP, with and without video; and additionally the maximum video streaming rate when combined with voice over IP (VoIP) calls and TCP controlled file transfers. We also analyze the effect of arbitrary queue size on the voice capacity, video-conferencing capacity and throughput, TCP and video streaming throughput; and determine bandwidth utilization for variable packet arrival rates. Our proposed model is generic in the sense that it provides a high level system view approach, and some of the existing approaches for Wi-Fi performance analysis become special cases of our model for specific queue sizes. The underlying method of our analytic model is to identify an embedded discretetime Markov chain at random times. The Markov chain consists of the number of nonempty queues or mobile STAs, the number of packets is waiting therein and the variable to keep track of which traffic classes are allowed to attempt in a channel slot. Here, the channel slot is defined as the interval between two successive channel activities, which are any sort of action carried out by a mobile station at any time. The stationary probabilities of all the Markov states are derived by solving a set of linear equations, thus obtaining the desired performance measures of IEEE 802.11 WLANs. Finally, we use the Qualnet simulator to simulate the Enhanced Distributed Channel Access (EDCA) model according to the IEEE 802.11 specifications. We also conduct an experimental study of the EDCA mechanism of the IEEE 802.11 standard with a real-environment testbed consisting of one access point and 11 laptops to further validate the analytical model and simulation results.

Download or read book Modeling Data Rate Agility in the IEEE 802 11a Wireless Local Area Networking Protocol written by Bryan E. Braswell and published by . This book was released on 2001-03-01 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IEEE 802.11a high-speed wireless local area networking (WLAN) protocol does not specify a mechanism for dynamically altering network data rates based on changing link conditions. This thesis first presents a baseline software model of the 802.11a protocol developed using the OPNET simulation tool. The model includes both the medium access control (MAC) and physical (PHY) layers of the standard. Two data rate agility mechanisms are then proposed and analyzed using the model. An infrastructure WLAN implementation of the baseline model is first simulated under standard network conditions to verify its operational characteristics and the results are presented. The model is then used to simulate two data rate agility mechanisms, one based on the link signal- to-noise ratio (SNR) and the other based on the frame loss rate at the transmitting Station. Each technique is simulated using an infrastructure WLAN consisting of a fixed access point and a mobile workstation operating with standard network traffic loads. The results indicate that the link SNR is a better decision criterion for data rate agility than the frame loss rate. The design and methodology of this analysis provides insight into dynamic rate agility mechanisms and the criteria that may be used in developing in future 802.11 a-compliant hardware imlementations.

Download or read book Performance Analysis of Radio Over Fiber Based on IEEE 802 11a written by Siti Idani Azuriati Abdul Aziz and published by . This book was released on 2011 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: