Patent ID: 9391813
Filing Date: 2016-07-12
CPC Classification: H04B,H04L

Claim Text:
1. A method for detecting long echo in an OFDM receiving system, the method comprising: receiving a sequence of OFDM symbols, each OFDM symbol including data subcarriers and pilot tones; increasing a number of pilot tones in at least one of the OFDM symbols; obtaining a power amplitude of at least one subcarrier of the at least one of the OFDM symbols by multiplying the at least one subcarrier by its complex conjugate; generating time-domain samples associated with the power amplitude of the at least one subcarrier; detecting a time difference between at least two peaks associated with the time domain samples; estimating a channel through which the OFDM symbol is received in accordance with a first pilot interpolation algorithm if the detected time difference is smaller than or equal to a predefined value; and estimating the channel in accordance with a second pilot interpolation algorithm if the detected time difference is greater than the predefined value wherein the second pilot interpolation algorithm comprises: