Difference between revisions of "WiMAX"

Revision as of 17:55, 8 December 2007

• IEEE Search, ASU Library
• WiMAX Trends Newsletter
• Martin Sauter, Communication Systems for the Mobile Information Society", Wiley, Chichester, England, 2006

-pp. 257-258 Theoretical capacity (78 Mbit/s) and Realistic capacity (24.12 Mbit/s) of 802.16

Project: Document due Tuesday, 11 December 2007

Theoretical capacity

• "Mobile WiMAX – Part I: A Technical Overview and Performance Evaluation", WiMAX Forum, August, 2006

-Scalable OFDMA (SOFDMA) [3] is

introduced in the IEEE 802.16e Amendment to support scalable channel bandwidths from 1.25 to 20 MHz.

Channelization

Doppler considerations

Computational Complexity

Computational capability in mobile devices

Project: Presentation on Thursday, 8 November

WiMAX "OFDM and Wimax (4G) Networking"

• (4.2) WiMAX on Wikipedia
• WiMAX Forum, wimaxforum.org
• WiMAX Forum white papers

-(4.3) "Fixed, nomadic, portable and mobile applications for 802.16-2004 and 802.16e WiMAX networks", November 2005

-(4.4) "Can WiMAX Address Your Applications?", October 24, 2005

• WiMAX introduction (ppt)
• IEEE WiMAX tutorial documents

-(4.5) Carl Eklund, Roger B. Marks, Kenneth L. Stanwood and Stanley Wang, "IEEE Standard 802.16: A Technical Overview of the WirelessMAN™ Air Interface for Broadband Wireless Access", IEEE Communications Magazine, June 2002

• WiMAX forum, "What is the actual throughput (data transfer rate) of WiMAX Technology?"
• "Work begins on 1Gbps Mobile WiMAX spec", Eric Bangeman, ARS, February 21, 2007

-"Those backing the new spec plan to increase bandwidth by using larger MIMO antenna arrays"

• "Millimeter Gigabit Gets Competition", Good absorption band chart
• "Multi-Gigabit Wireless Research", Tech News, July, 2007 (Research at Georgia Tech on short range gigabit transmission to replace wires)

Articles

• (4.1) Pei-Yun Tsai, Tsung-Hsueh Lee and Tzi-Dar Chiueh, "Power-Efficient Continuous-Flow Memory-Based FFT Processor for WiMax OFDM Mode", Processing and Communication Systems (ISPACS2006), Yonago Convention Center, Tottori, Japan
• Mohammad Azizul Hasan, "Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer", Masters Thesis, Helsinki University of Technology, June 2007.
• Bruce Bennett, Pamela Hemmings, "Operational Considerations of Deploying WiMAX Technology as a Last-Mile Tactical Communication System"
• "Defining 4G: Understanding the ITU Process for the Next Generation of Wireless Technology", 3G Americas, June 2007
• David Teyao Chen, "On the Analysis of Using 802. 16e WiMAX for Point-to-Point Wireless Backhaul", 2007 IEEE
• Khaled Fazel, Stefan Kaiser, Khaled Fazel, Stefan Kaiser, Multi-Carrier and Spread Spectrum Systems, John Wiley and Sons, 2003
• "Gaining Spectral Efficiency with OFDM", National Instruments
• Eli Sofer, Tutorial on Multi Access OFDM (OFDMA) Technology, Runcom Technologies Ltd.
• Hassan Yaghoobi, "Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN", Intel Technology Journal, 2004
• Raj Jain, "IEEE 802.16m Update", Washington University
• > (4.6) Wei Zhang, Xiang-Gen Xia, Khaled Ben Letaief, "Space-Time/Frequency Coding for MIMO-OFDM in Next Generation Broadband Wireless Systems", IEEE Wireless Communications, June 2007
• Steve Lloyd, "Challenges of Mobile WiMAX RF Transceivers", IEEE, 2006
• Fawzi Behmann, "Impact of Wireless (Wi-Fi, WiMAX) on 3G and Next Generation — An Initial Assessment", IEEE Conference on Electro Information Technology, May 2005

Achieving 1Gbps

• Martin Sauter, Communication Systems, John Wiley & Sons, Ltd, 2006

-5.10.2 MIMO: A typical MIMO system makes use of two or four paths, which requires two or four antennas respectively. In current systems, antenna designs are used which already incorporate two antennas to pick up horizontally and vertically polarized signals created by reflection and refraction to counter the multipath fading effect (polarized diversity).

• MIMO on Wikipedia
• Advanced MIMO on Wikipedia
• MIMO and WiMAX on Wikipedia
• Robert Syputa, "The WiMAX vs. Cellular Debate … or Is It?", WiMAX Trends, 2007(?)

-WiMAG and 3G LTE (Long Term Evolution) face the same hurdles, and are not imcompatible, SDR handsets might use both to advantage

-B3G (beyond 3G)

-ITU’s goals for IMT-Advanced appear quite bold: A multi-service platform capable of providing per-user bandwidths of 1 Gbps fixed-nomadic and 100 Mbps mobile.

-OFDMA is the core link technology for WiMAX and LTE 4G, but the performance gains must be built upon through an evolution more to do with how networks. The impact of the evolutionary shift to take advantage of the ‘spatial’ and architectural domain of wireless development will be to greatly increase bandwidth density while reducing costs. Suffice it to say that the shift is to a new evolutionary platform with all that this implies: An additional dimension of development that will deliver 3X-10X total network throughput improvement over cellular wireless.

• B. Muquet, S. Sezginer, H. Sari, "MIMO Techniques in Mobile WiMAX Systems ─ Present and Future", WiMAX Trends, 2007(?)
• B. Muquet, E. Biglieri, A. Goldsmith, H. Sari, "MIMO Techniques for Mobile WiMAX Systems", SEQUANS Communications White Paper, ?

-Compared to TDMA-based systems, it is known that OFDMA leads to a significant cell range extension on the uplink (from mobile stations to base station). This is due to the fact that the transmit power of the mobile station is concentrated in a small portion of the channel bandwidth and the signal-to-noise ratio (SNR) at the receiver input is increased. Cell range extension is also achievable on the downlink (from base station to mobile stations) by allocating more power to carrier groups assigned to distant users. Another interesting feature of OFDMA is that it eases the deployment of networks with a frequency reuse factor of 1, thus eliminating the need for frequency planning.

-The performance improvement that results from the use of diversity in wireless communications is well known and often exploited. On channels affected by Rayleigh fading, the BER is known to decrease proportionally to SNR^-d, where SNR designates the signal-to-noise ratio and d designates the system diversity obtained by transmitting the same symbol through d independently faded channels. Diversity is traditionally achieved by repeating the transmitted symbols in time, in frequency or using multiple antennas at the receiver. In the latter case, the diversity gain is compounded to the array gain, consisting of an increase in average receive SNR due to the coherent combination of received signals, which results in a reduction of the average noise power even in the absence of fading.

• Hermann Lipfert, "MIMO OFDM Space Time Coding – Spatial Multiplexing Increasing Performance and Spectral Efficiency in Wireless Systems", Institute for Rundfunktechnik, August 2007
• Ferngene Kook, Wendy Herman, "WiMAX – 4G Mobile Broadband for a Hyperconnected World", Nortel, September 2007

-4G promises very high capacity, and peak data rates in some configurations of more than 100 Megabits per second (Mbit/s) compared to about 15 Mbit/s for current wireless technologies. The first of the 4G standards being implemented is WiMAX, identified by Forbes magazine in 2006 as one of the top 10 technologies that will change the way we live.

Last printed: 4.6