| Presentation | 2002/2/15 Compensating method for nonlinear distortion by using neural network in digital satellite broadcasting Mitsugu OHKAWA, Ryuji KOHNO, Hiromitsu WAKANA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The transmission path in digital satellite broadcasting is characterized by a linear frequency dependence on the amplitude-frequency characteristics, group-delay-frequency characteristics, and AM/AM and AM/PM conversion effects due to traveling-wave tube amplifier (TWTA) nonlinearity. The AM/AM conversion effects result from the nonlinearity between the input and output amplitudes, while the AM/PM conversion effects result from the nonlinearity between the input amplitude and the output phase of the satellite transponder. We have developed a method for identifying and compensating for the linear frequency dependence and nonlinearity of a TWTA. This method combines an equalizer and a linearizer through the use of an adaptive algorithm. The linearizer is based on the neural-network concept. In our method, the reversal characteristics of the TWTA nonlinearity are identified, and the TWTA nonlinearity is compensated by using an error back-propagation algorithm based on a neural network. In this paper, we describe the development, features, and performance of our hybrid LMS-neural-network distortion-compensating method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | neural network / satellite broadcasting / linearizer / nonlinear distortion |
| Paper # | SANE2001-134,SAT2001-156 |
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| Conference Information | |
| Committee | SAT |
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| Conference Date | 2002/2/15(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Satellite Telecommunications (SAT) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Compensating method for nonlinear distortion by using neural network in digital satellite broadcasting |
| Sub Title (in English) | |
| Keyword(1) | neural network |
| Keyword(2) | satellite broadcasting |
| Keyword(3) | linearizer |
| Keyword(4) | nonlinear distortion |
| 1st Author's Name | Mitsugu OHKAWA |
| 1st Author's Affiliation | Kashima Space Research Center, Communications Research Laboratory() |
| 2nd Author's Name | Ryuji KOHNO |
| 2nd Author's Affiliation | Div. of Phys., Ele. and Comp. Eng., Graduate School of Eng., Yokohama National University |
| 3rd Author's Name | Hiromitsu WAKANA |
| 3rd Author's Affiliation | Wireless Communications Division, Communications Research Laboratory |
| Date | 2002/2/15 |
| Paper # | SANE2001-134,SAT2001-156 |
| Volume (vol) | vol.101 |
| Number (no) | 655 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |