Patent ID: 7266164
Filing Date: 2007-09-04
Classification: H04L

Abstract:
1. An apparatus for symbol timing detection for a wireless communication system, for detecting a start of user data of a packet having a cyclically repeating preamble in the wireless communication system, the apparatus comprising: a mapper for mapping a received packet signal with a predetermined number of bits; an autocorrelation delay processor for delaying the mapped signal of the mapper by a correlation delay sample according to an autocorrelation of the received signal, and converting the delayed signal to a complex conjugate signal; a multiplier for multiplying the signal, delayed by the correlation delay sample and converted to a complex conjugate signal from the autocorrelation delay processor, by the mapped signal of the mapper; a first moving average calculator for storing an output signal of the multiplier in a shift register having a predetermined window size, and calculating an average of a shifted value according to signal reception to output a moving average; a squarer for making the second power of the mapped signal of the mapper; a second moving average calculator for storing an output signal of the squarer in a shift register having a window size equal to the moving average, and calculating an average of a shifted value according to signal reception to output a second moving average; and a symbol timing detector for extracting the start of the user data using an absolute value of an output signal of the first moving average calculator and an output signal of the second moving average calculator.