Title:
ORTHOGONAL CHANNELIZER IN DIGITAL DEMODULATOR
Document Type and Number:
Japanese Patent JP3476744
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To allow an orthogonal channelizer to cope with many applications requiring different input data rates and an input channel group bandwidth.
SOLUTION: The orthogonal channelizer 20 receiving input and output sampling rates and an input channel group bandwidth decides an input channel interval, a size of discrete Fourier transform(DFT) and a valid output DFT pin, a blanking filter block 22 applies blanking processing to a prescribed number of data samples for a period of a guard time to generated a blank sample output, a cyclic shift block 24 generates a phase adjustment output by conducting s phase shift in response to a prescribed number of shifts. Then a discrete Fourier transform(DFT) block 26 receives a phase adjustment output to calculate a DFT so as to generate a plurality of channels with a different data rate.
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Inventors:
Charlotte N Rosek
Application Number:
JP2000136650A
Publication Date:
December 10, 2003
Filing Date:
May 10, 2000
Export Citation:
Assignee:
TRW INCORPORATED
International Classes:
H03H17/02; H04B14/00; H04J11/00; H04L5/06; H04L27/22; H03H17/00; (IPC1-7): H04L27/22; H03H17/00; H03H17/02; H04B14/00; H04J11/00
Domestic Patent References:
| JP2000224134A | ||||
| JP63262759A | ||||
| JP4245562A | ||||
| JP712862A | ||||
| JP8211110A |
Other References:
【文献】米国特許5365470(US,A)
【文献】米国特許5329473(US,A)
【文献】米国特許5898399(US,A)
【文献】米国特許5535240(US,A)
【文献】米国特許5537435(US,A)
【文献】米国特許5329473(US,A)
【文献】米国特許5898399(US,A)
【文献】米国特許5535240(US,A)
【文献】米国特許5537435(US,A)
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)