Fading channel modeling
AssigneeXilinx, Inc.
InventorDavid Andrews
Life of this patent
Estimating the term…
Abstract
Simulation of noise and, more particularly, a coefficient generator for channel modeling, is described. A spectrum memory is for storing sets of constants for respective harmonics. At least one phase noise source is configured for generating phase noise. An Inverse Fourier Transform block is coupled to the spectrum memory and to the at least one phase noise source. The Inverse Fourier Transform block is configured to provide a read address to the spectrum memory for accessing at least one constant of a set of constants of the sets of constants from the spectrum memory and coupled to receive the phase noise from the at least one phase noise source.
Claims20
A coefficient generator for channel modeling, comprising:
- memory for storing sets of constants for respective harmonics;
- at least one phase noise source configured for generating phase noise;
- and
- an Inverse Fourier Transform block coupled to the memory and to the at least one phase noise source, the Inverse Fourier Transform block configured to provide a read address to the memory for accessing at least one constant of a set of constants of the sets of constants from the memory, the Inverse Fourier Transform block coupled to receive the phase noise from the at least one phase noise source.
A method for generating coefficients for channel modeling, comprising:
- instantiating a coefficient generator in an integrated circuit having programmable logic, the instantiating including programming the programmable logic;
- generating phase noise;
- filtering the phase noise to band pass a portion of the phase noise responsive to a Doppler frequency;
- obtaining constants from memory, the constants obtained for respective sample points of a harmonic;
- and
- performing an Inverse Discrete Fourier Transform responsive to the filtered phase noise and the constants.
A method for generating coefficients for channel modeling, comprising:
- instantiating a coefficient generator in a programmable device, the instantiating including programming programmable logic;
- generating phase noise;
- obtaining constants from memory, the constants obtained for respective sample points of a harmonic;
- performing an Inverse Discrete Fourier Transform responsive to the phase noise and the constants to provide a noise-shaped response in a time domain;
- and
- interpolating the noise-shaped response between pairs of the sample points to provide a simulation of at least one channel in a communication system.
Dependencies are inferred from the claim text.