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Channel Spectral Characteristics

Channel Spectral Characteristics. Some Polyphase Filter Options. FDM-to TDM Standard Channelizer: Collection of Downconverters. FDM-to TDM Polyphase Channelizer: Input Commutator, M-Path Filter, and FFT.

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Channel Spectral Characteristics

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  1. Channel Spectral Characteristics

  2. Some Polyphase Filter Options

  3. FDM-to TDM Standard Channelizer: Collection of Downconverters

  4. FDM-to TDM Polyphase Channelizer: Input Commutator, M-Path Filter, and FFT

  5. Conventional Channelizer ApplicationChannelize and Downsample to Nyquist Rate, Interpolate to Two Times Symbol Rate

  6. Enhanced Channelizer SolutionReplace Interpolator Function With Buffer Addressing

  7. Standard Downconverter:Heterodyne, Filter, Resample

  8. Equivalency TheoremHeterodyne and Low Pass Filter Same as Band Pass Filter and Heterodyne

  9. Slide Heterodyne Through Filter:Convert Low-Pass to Band-Pass

  10. Slide Heterodyne Through Downsampler:Alias Frequency of Heterodyne

  11. Select Input Center Frequency That Aliases to DC Under Resampling

  12. Discard Trivial Heterodyne: Now a Scalar Multiply by Unity

  13. Noble IdentityInterchange Order of Filter and Resample

  14. M-Path Partition of FIR Filter

  15. Example of Polyphase (M-Path) Partition

  16. Block Diagram of M-Path Filter

  17. Pull Resamplers Through Filters in Each path

  18. Delays and Synchronous Rersamplers are Equivalent to Input Commutator

  19. Input Series in Each Path of M-Path Filter have Offset Time Origins

  20. Path Filters are Interpolators: Computing Output Samples with Common Time Origin

  21. Phase Response of Paths in Ten Stage Polyphase Filter

  22. Group Delay of Paths in Ten-Stage Polyphase Filter

  23. Modulation Property for Z-Transform

  24. Polyphase Partition of Band-Pass Filter

  25. Spectral Response of Signal in Resampled Pass Band Filter

  26. Performance Specifications for50-Channel Polyphase Channelizer

  27. Required Spectral Response of Channel Filter at Output and at Input Rates

  28. Time and Frequency Response of Remez Filter Design

  29. Time and Frequency response of Remez Filter Design with Modified End Points

  30. Time and Frequency Response of Prototype Filter at Output Sample Rate

  31. Commutators for Standard Input Buffer and for Circular Input Buffer

  32. Standard Polyphase Channelizer and Modified Channelizer with Circular Buffers

  33. Content of 64-Point Circular Input Buffer for Two Successive 48 Point Input Blocks

  34. Shifting Time Origin for Input Data of Polyphase Filter and of Resetting FFT

  35. Contents of Transfer Circular Buffer Aligning Origins for Successive Input Blocks

  36. Input Time and Spectrum to 30 Channel, 40 Point FFT Channelizer

  37. Time Series from 30 Channel Channelizer

  38. Spectra for 30 Channel Channelizer

  39. Input Time and Spectrum to 50 Channel, 64 Point FFT Channelizer

  40. Time Series from 50 Channel Matched Filter Channelizer

  41. Spectra from 50 Channel Matched Filter Channelizer

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