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 Low Noise Amplifier Performance Study for Wireless Man Based on IEEE 802 16A Standard written by Mazhaniza Mazumil and published by . This book was released on 2007 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Design of a Low noise Amplifier for an IEEE802 11a Wireless Communication Receiver written by Feng Chen and published by . This book was released on 2004 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless communication and its application have been growing rapidly in recent years. With the recent advances in CMOS technology, Radio Frequency CMOS IC design provides a potential solution for System-On-Chip. This dissertation explores the design of a fully integrated CMOS Low-Noise Amplifier for an IEEE 802.11a wireless communication receiver. A new design methodology is presented for optimization of feedback to achieve simultaneous noise and gain match. Two-port noise theory is extended to multi-port noise analysis for a three-port-to-two-port noise transformation. This approach is applied in the design of a 5.3-GHz LNA in a CMOS 0.18-um technology. The measurement gives a nominal forward gain of 5.2 dB, input and output impedance matching of -9.3 dB and -8.9 dB respectively, isolation of -42.8 dB, estimated noise figure of 4.8 dB with the circuit drawing 4.2-mA from a 1.5-V supply. A novel process-variation insensitive network is proposed to realize the on-chip impedance matching that minimizes the effect of process variation. The proposed network utilizes precision matching capacitors to achieve a low sensitivity to process variation. Its performance is demonstrated by Monte Carlo simulations.
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 Broadband CMOS Power Amplifier for IEEE 802 11 A b g Wireless LAN Transmitters written by Chin-Yung Chiu and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In recent years, the research of integrated circuits for RF transceivers has been focussed on achieving higher level of integration. Since the successful of the implementation of monolithic transceivers, more and more attentions are drawn to the development of multi-standard transceivers for even higher level of system integration and flexibility to communicate using existing infrastructures when moving to different locations or when the access of networks using different communication standards is needed. While other multi-standard RF transceiver components are under intensive research, little attention is received for the multi-standard power amplifiers because of the power efficiency concerns and the very different specifications for power amplifiers using different standards. For an RF CMOS power amplifier, the problem is even more severe because of the intrinsic limitations of the process such as low breakdown voltage small transconductance compared to the other process. This work targets power amplifiers for IEEE 802.11 a/b/g because of their similar linearity and output power requirements. A broadband solution is proposed in this thesis. To date, most of the PA designs attempt to maximize the quality factor of the on-chip elements such as spiral inductors to minimize the power efficiency degradation while the others try to use bondwires or off-chip elements as a work around. This thesis attempts to describe a different approach by adopting Low-Q inductors to achieve broadband power amplification for multi standards with reasonable power efficiency performance. The basics, working principles, design, simulation and measurement result of the power amplifier as well as the performance comparison with the other power amplifiers in the literature and in the market are described in this dissertation.
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 IEEE 802 11A Signals Under Different Operational Environments written by Roy Chan Hsiung Wei and published by . This book was released on 2004-09 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid employment of wireless networks commercially, the military is seeking viable solutions for providing high-speed wireless network throughout the battle space. The IEEE 802.11a wireless LAN presents an attractive solution providing up to 54 Mbps data-link bandwidth. Moreover, it operates in the less congested 5-GHz U-NII band and possesses more operating channels. This research implemented two prototype systems using low-cost commercially available hardware. The Cisco Aironet 1400 wireless bridge and the Proxim Tsunami MP.11a wireless system were chosen for their superior specifications and for their reputation of being market leaders in IEEE 802.11 wireless products. The performances of the prototype systems were evaluated in three operational environments (land, water and vegetation). The data collected were then compared to the theoretical performance.
Download or read book Fundamental Concepts on Wireless LAN and the IEEE 802 11 Protocol written by Dereje Yohannes Ashenafi and published by Dereje Yohannes. This book was released on 2011 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 IEEE 802 11ba written by Steve Shellhammer and published by John Wiley & Sons. This book was released on 2023-01-04 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: IEEE 802.11ba Discover the latest developments in IEEE 802.11ba and Wake-up Radios In IEEE 802.11ba: Ultra-Low Power Wake-up Radio Standard, expert engineers Drs. Steve Shellhammer, Alfred Asterjadhi, and Yanjun Sun deliver a detailed discussion of the IEEE 802.11ba standard. The book begins by explaining the concept of a wake-up radio (WUR) and how it fits into the overall 802.11 standard, as well as how a WUR saves power and extends battery life. The authors go on to describe the medium access control (MAC) layer in detail and then talk about the various protocols used to negotiate WUR operation, its uses for different functionalities (like wake up of the main radio, discovery, synchronization, and security). The book offers a detailed description of the physical (PHY) layer packet construction and the rationale for the design, as well as the various design aspects of the medium access control layer. It also includes: A thorough introduction to the motivations driving the development of the WUR in 802.11 Practical overviews of IEEE 802.11, including the basic concepts of 802.11 (the PHY and MAC) and background material on current low power modes Comprehensive discussions of the physical layer and PHY layer performance, including the generic receiver, the PPDU, Transmit Diversity, and the FDMA mode In-depth examinations of the medium access layer and its frame designs Perfect for professional wireless engineers, IEEE 802.11ba: Ultra-Low Power Wake-up Radio Standard will also earn a place in the libraries of academics and students researching and studying in fields involving wireless communications.
Download or read book Performance Analysis of IEEE 802 11A Signals Under Different Operational Environments written by and published by . This book was released on 2004 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid employment of wireless networks commercially, the military is seeking viable solutions for providing high-speed wireless network throughout the battle space. The IEEE 802.11a wireless LAN presents an attractive solution providing up to 54 Mbps data-link bandwidth. Moreover, it operates in the less congested 5-GHz U-NII band and possesses more operating channels. This research implemented two prototype systems using low-cost commercially available hardware. The Cisco Aironet 1400 wireless bridge and the Proxim Tsunami MP.11a wireless system were chosen for their superior specifications and for their reputation of being market leaders in IEEE 802.11 wireless products. The performances of the prototype systems were evaluated in three operational environments (land, water and vegetation). The data collected were then compared to the theoretical performance.
Download or read book IEEE 802 11 Handbook written by Bob O'Hara and published by IEEE Standards Association. This book was released on 2005-01-24 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first generation 802.11 wireless market, once struggling to expand, has spread from largely vertical applications such as healthcare, point of sale, and inventory management to become much more broad as a general networking technology being deployed in offices, schools, hotel guest rooms, airport departure areas, airplane cabins, entertainment venues, coffee shops, restaurants, and homes. This has led to the tremendous growth of new sources of IEEE 802.11 devices. IEEE 802.11 equipment is now moving into its second stage, where the wireless LAN is being treated as a large wireless communication system. As a system, there is more to consider than simply the communication over the air between a single access point and the associated mobile devices. This has lead to innovative changes in the equipment that makes up a wireless LAN. The IEEE 802.11 Handbook: A Designer’s Companion, Second Edition is for the system network architects, hardware engineers and software engineers at the heart of this second stage in the evolution of 802.11 wireless LANs and for those designers that will take 802.11 to the next stage.
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:
