Estimation of length of channel impulse response
AssigneeKoninklijke Philips Electronics N.V.
InventorsConstant Paul Maie Jozef Baggen, Sri Andari Husen, Alessio Filippi
Life of this patent
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Abstract
In a receiver for processing OFDM encoded signals, wherein the OFDM encoded digital signals are transmitted by means of a symbol in each of subcarrier frequency channels, with at least some of said subcarriers containing user data symbols, an initial estimate of a channel frequency response is formed from magnitudes of user data symbols received in those subcarriers. Then, a correlation function of a channel impulse response is estimated by performing an inverse Fourier transform on the initial estimate of the channel frequency response, and the length of the channel impulse response is estimated by examining peaks in the estimated correlation function of the channel impulse response.
Claims15
A method of processing OFDM encoded signals, wherein said OFDM encoded digital signals are transmitted in a plurality of subcarrier frequency channels, the method comprising:
- receiving an OFDM encoded signal comprising a symbol in each of said subcarriers, wherein at least some of said subcarriers contain user data symbols;
- forming an initial estimate of a channel frequency response from magnitudes of user data symbols received in said subcarriers;
- estimating a correlation function of a channel impulse response by performing an inverse Fourier transform on the initial estimate of the channel frequency response;
- and
- estimating a length of a channel impulse response by examining peaks in the estimated correlation function of the channel impulse response.
Dependencies are inferred from the claim text.