tailieunhanh - Ultra Wideband Communications Novel Trends System, Architecture and Implementation Part 2

Tham khảo tài liệu 'ultra wideband communications novel trends system, architecture and implementation part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Measurements of the Nonlinearity of the Ultra Wideband Signals Transformation 15 This example illustrates special importance of linearity in UWB receivers. Besides it is clear that for UWB receivers testing one should use UWB signals. In nonlinear radars and nonlinear reflectometers such measurements are necessary to observe the nonlinear response of the object against the background of nonlinear distortions in the receiver E. Semyonov A. Semyonov 2007 . 8. Conclusion The considered method is effective for the following tasks. 1. Investigation of devices for example receivers for ultra wideband communication systems including design stage . 2. Detection of imperfect contacts and other nonlinear elements in wire transmission lines. 3. Remote and selective detection of substances with the use of their nonlinear properties. The main advantages of the considered approach are listed below. 1. Real signals transmitted in UWB systems can be used as test signals. 2. Nonlinear signal distortions in the generator are acceptable. 3. Measurement of distance from nonlinear discontinuity is possible. 4. Nonlinear response is several times greater than the response to sinusoidal or two-frequency signal. The designed devices and measuring setups show high efficiency for frequency ranges with various upper frequency limits from 20 kHz to 20 GHz . The developed virtual analyzers provide corresponding investigations of devices and systems at design stage. 9. Acknowledgment This study was supported by the Ministry of Education and Science of the Russian Federation under the Federal Targeted Programme Scientific and Scientific-Pedagogical Personnel of the Innovative Russia in 2009-2013 the state contracts no. P453 and no. P690 and under the Decree of the Government of the Russian Federation no. 218 the state contract no. . 10. References Arnstein D. 1979 . Power division in spread spectrum systems with limiting. IEEE Transactions on Communications March 1979