Spectrum shaping SAW filters for high-bit-rate digital radio |
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| Authors: | Ganss-Puchstein R Ruppel C W Stocker H R |
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| Affiliation: | Siemens AG, Munich; |
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| Abstract: | The structure of a QAM radio system is explained. Some novel designs that demonstrate the current status of spectral shaping SAW (surface acoustic wave) filters are presented. Compensation of second-order effects is discussed. Experimental results for a filter for a 140-Mb/s 16 QAM cochannel system with a roll-off factor of 0.19 are shown. Two other examples of filters for a 140-Mb/s, 64 QAM system with a 35% relative bandwidth are also presented |
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