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US 6,173,011 B2Granted
Forward-backward channel interpolator
AssigneeGlenayre Electronics, Inc.
InventorsClaudio Gustavo Rey, Ognjen B. Katic
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AssigneeGlenayre Electronics, Inc.
InventorsClaudio Gustavo Rey, Ognjen B. Katic
Estimating the term…
An interpolator having a linear phase response has a first stage implemented with an IIR filter to achieve the narrow transition bandwidth with relatively few filter coefficients. Zero-stuffing and filtering are used to achieve the interpolation. A forward-backward filtering methodology is then used to achieve a linear phase response for the IIR filter. The input sequence to be interpolated is zero stuffed and passed through the IIR filter a first time. Then the time order of the resulting sequence is reversed and then passed through the IIR filter a second time. After that, the resulting output sequence is reversed again. Guard blocks are added to both ends of the input sequence, and then a block of zeros is appended to the zero-stuffed guarded input sequence. The appended zero block causes the startup and ending transient effect of the IIR filter's step response to be equal at both ends, which tends to improve the accuracy of the interpolation. Subsequent zero-stuffing and filtering by FIR filter stages are used to further increase the interpolation. A linear interpolator may also be included after the FIR filter stages.
A method of interpolating a channel response, the channel response being a sequence of values, the method comprising:
An interpolator for interpolating a channel response, the channel response being a sequence of samples, the interpolator comprising:
A channel interpolator for use in an equalizer in interpolating a channel response, the channel response being a sequence of samples, the channel interpolator comprising:
Dependencies are inferred from the claim text.