Claims
- 1. A digital channelizer for a wideband signal of K channels, comprising:
an analysis filter coupled to each of said K channels; a Fast Fourier Transform (FFT) filter bank coupled to said analysis filter for converting each of K channels into a plurality of frequency domain subchannels; an inverse FFT filter bank coupled to L channels from said FFT filter bank, wherein L is less than K, and wherein said inverse FFT filter bank converts said L users to a time domain data set; and a synthesis filter coupled to said inverse FFT filter bank performing partial reconstruction of said time domain data set.
- 2. The digital channelizer according to claim 1, wherein said analysis filter is a decimation unit and a polyphase filter.
- 3. The digital channelizer according to claim 1, wherein said synthesis filter is a polyphase filter and an expander unit.
- 4. The digital channelizer according to claim 1, wherein said synthesis filter uses a mean squared error signal reconstruction.
- 5. The digital channelizer according to claim 1, wherein said analysis filter is processed according to:
- 6. The digital channelizer according to claim 1, wherein said analysis filter has a stop band attenuation greater than about 90 dB.
- 7. The digital channelizer according to claim 6, wherein said analysis filter has a 6 dB crossover point with an adjacent channel.
- 8. The digital channelizer according to claim 6, wherein said analysis filter is a four fold analysis and said synthesis filter is an eight fold analysis.
- 9. The digital channelizer according to claim 1, wherein said reconstruction filter has a stop band attenuation greater than about 50 dB.
- 10. The digital channelizer according to claim 1, wherein said synthesis filter is the solution to the set of linear constraints defined as
- 11. The digital channelizer according to claim 1, further comprising a residual phase rotation of
- 12. A multirate filter bank with an analysis and synthesis filter set providing high performance signal detection with alias free recombination for signals spanning multiple frequency bins, comprising:
an analysis filter coupled to each of said K channels; a Fast Fourier Transform (FFT) filter bank coupled to said analysis filter for converting each of K channels into a plurality of frequency domain subchannels; an inverse FFT filter bank coupled to L channels from said FFT filter bank, wherein L is less than K, and wherein said inverse FFT filter bank converts said L users to a time domain data set; and a synthesis filter coupled to said inverse FFT filter bank performing partial reconstruction of said time domain data set according to a least squared fit criteria.
RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Applications No. 60/407,874, filed Aug. 29, 2002, which is herein incorporated in its entirety by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60407874 |
Aug 2002 |
US |