Über den Autor
Prof. Ramjee Prasad is the Director of the Wireless Centre at Aalborg University in Denmark. He recently won a distinguished "Nordic" award for research achievements in the field of wireless communications. Ramjee Prasad is editor-in-chief for our Wireless Personal Communication journal and has also published over 15 books, mostly with Artech House though he is now eager to start publishing more of his books also with Springer.
1. Introduction. 1.1. History of UWB. 1.2. Preview of the Book. References.
2. UWB for Wireless Communications. 2.1. UWB definition. 2.2. FCC Mask. 2.3. UWB Features. 2.4. Summary. Problems. References.
3. UWB Antennas. 3.1. Antenna requirements. 3.2. Radiation mechanism of the UWB Antenna. 3.3. Link Budget for UWB system taking into account the UWB antennas. 3.4. Short Range Analysis of UWB Antennas. 3.5. Summary. Problems. References.
4. Ultra Wide band UWB Wireless Channels. 4.1. Impulse Response Modeling of UWB Wireless Channels. 4.2. Modified Impulse Response Method. 4.3. The IEEE UWB Channel Model. 4.4. Frequency Modeling of UWB Channels. 4.5. Comparison of Time and Frequency Models. 4.6. Summary. Problems. References.
5. UWB Interference. 5.1. An Example: IEEE802-11.a Interference. 5.2. General Method of Signal to Interference Ratio Calculation. 5.3. Interference of UWB to Existing OFDM System. 5.4. Interference of UWB to Narrowband systems. 5.5. Interference to WiMax. 5.6. Interference Reduction. 5.7. Interference Mitigation of Wideband system on UWB using Multicarrier Templates. 5.8. Summary. Problems. References
6. UWB Signal Processing. 6.1. Modulation. 6.2. BER of Modulation Scheme. 6.3. Rake Receiver. 6.4. Transmit-Reference (T-R) Technique. 6.5. UWB Range- Data Rate Performance. 6.6. UWB Channel Capacity. 6.7. Summary. Problems. References.
7. UWB Technologies. 7.1. Impulse Radio. 7.2. Pulsed Multiband. 7.3. Multiband OFDM. 7.4. Comparison of UWB Technologies. Problems. References.
8. UWB Wireless Locationing. 8.1. Position Locationing Methods. 8.2. Time of Arrival Estimation. 8.3. NLOS Location Error. 8.4. Locationing with OFDM. 8.5. Summary. Problems. References.
9. UWB Applications. 9.1. Wireless Ad hoc Networking. 9.2. UWB Wireless Sensor Networks. 9.3. RFID. 9.4. Consumer Electronics and Personal Computers (PC). 9.5. Asset Location. 9.6. Medical Applications. 9.7. Summary. Problems. References.
10. UWB Regulation. 10.1. UWB Regulation in US. 10.2. UWB Regulation in Europe. 10.3. UWB Regulation in Japan. 10.4. UWB Regulation in Korea. 10.5. UWB Regulation in Singapore. 10.6. UWB Regulation in ITU. 10.7. IEEE Standardisation. 10.8. Summary. Problems. References.
11. The Vision of Europe on UWB Applications. 11.1. Magnet (My Personal Adaptive Global NET). 11.2. Magnet Beyond. 11.3. Pulsers (Pervasive Ultra-wideband Low Spectral Energy Radio Systems) 11.4. Summary. References.
asakta-buddhih sarvatra . jitatma vigata-sprhah . . . . naiskarmya-siddhim paramam . sannyasenadhigacchati Detached by spiritual intelligence from everything controlling the mind, without material desires, one attains the paramount perfection in cessation of re- tions by renunciation. The Bhagvad Gita (18.49) Compared to traditional carrier-based, Ultra-Wide Band (UWB), or carrier-less, systems implement new paradigms in terms of signal generation and reception. Thus, designing an UWB communication system requires the understanding of how excess bandwidth and very low transmitted powers can be used jointly to provide a reliable radio link. UWB offers systems transceiver potential for very simple implementations. Comparison between UWB and traditional narrow-band systems highlights the following features: Large bandwidth enables very fine time-space resolution for accurate lo- tion of the UWB nodes and for distributing network time stamps. Very short pulses are effectively counter-fighting the channel effect in very dense multipath environments. Data rate (number of pulses transmitted per bit) can be traded with power emission control and distance coverage. Very low power density leads to low probability of signal detection and adds security for all the layers of the communication stack. Very low power density is obtained through radio regulation emission masks; UWB systems are suitable for coexistence with already deployed narrow-band systems.
The aim of this book is to provide interesting material to (graduate) students and researchers working in the field of commercial Ultra Wide Band (UWB) wireless communications. The book will also be useful for the practicing engineers from industry who deal with the wireless systems that are designed and analyzed with the UWB technique. UWB technology has a history dating back one hundred years when G. Marconi sent the first ever wireless transmission from the Isle of Wight to Cornwall on the British mainland using spark-gap transmitters. In the past three decades military developed the UWB technology for ground penetrating radar. Ultra wide band communication is based on the transmission of very short pulses with relatively low energy. In the near future this technology may see increased use for high-speed short range wireless communications and ranging.