5G, SATCOM, or Radar Filter Requirements
Shahram Shafie
Technical Engineering Management, Product Architect, and Systems Definer, Antenna, at ORTENGA
Filters are widely used in radio communications and radar systems. In fact, multiple filters are used across any radio, namely; Preselector Filter, Image Rejection Filter, Channel Select Filter, Anti Aliasing Filter, Digital Filter in Decimation and Interpolation to cover some of them.
As the above filter names indicate, they impact anywhere from linearity, image rejection, resolution of ADC/DAC to DSP systems performances.? There are tradeoffs where to put filter and set its requirements in such a way that optimizes the system performance over all operational conditions.
Filter requirements impact other blocks performance requirements, such as; PA, LNA, Mixer, ADC/DAC, PLL, and Antenna. There are multiple Filter Topologies in Analog or Digital domains, such as; Butterworth, Tchebyshev, Elliptical, Bartlett, Hanning, Hamming, Blackman/Harris, or Kaiser filter.? Analog filters are implemented in the frequency domain, while digital filters are in time domain.
It is challenging task to relate each filter requirements to actual system metrics at radio level. ?It requires both understanding of systems as well as impairments caused by lack of adequate filtering to draw and analyze appropriate filtering and implement them at the proper stage in the radio.
These filters are used in UE Mobile Wireless, UT SATCOM, SATCOM HUB, Mobile Infrastructures, and Radar Systems. If your system has Rx Sensitivity, interference, blocker, simultaneous listens and talks, ADC/DAC clipping issues, then it may need additional filtering or filtering at proper stage to mitigate the issues.
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