Detection and estimation of narrowband interference by matrix multiplication

摘要

One or more processing units are programmed to select from among M tones in a frequency domain representation of a signal, a set of tones including at least a strongest tone (relative to background noise) and a tone adjacent thereto. From among M complex numbers in the frequency domain representation of the signal, a set of complex numbers are identified and denoted as a vector Z, corresponding to the selected set of tones. Vector Z is then multiplied with each of M columns of a matrix G which is predetermined to identify a sub-resolution maxima in Z. The M products that result from the vector multiplication of Z and G are used to determine and store in memory at least one or both of: (A) a flag indicating presence or absence of narrowband interference in the signal; and (B) an estimate of a frequency of the narrowband interference.

主权项

1. A method for processing an input signal, the method comprising:
selecting a first tone from a plurality of tones in a frequency domain representation of the input signal, wherein the first tone comprises a strongest tone from among the plurality of tones; selecting a second tone from the plurality of tones, wherein the second tone is adjacent to the first tone; selecting a first set of complex numbers from a plurality of complex numbers in the frequency domain representation that correspond to the first tone and the second tone, wherein the first set of complex numbers are a first vector; vector multiplying the first vector with a first predefined matrix to generate a first set of products; and determining whether an interference signal is present in the input signal and determining an estimated frequency of the interference signal as defined by the first set of products.