A Study on Power Delay Profile Measurement Using IEEE 802.11g Based Long Preamble Signals for WLAN Systems at 2.4 GHz Band

This paper proposes a measurement scheme of power delay profiles using IEEE 802.11g based wireless packets at 2.4 GHz band. In the proposed scheme, at first, a signal analyzer which can save the received Ich and Qch signal receive the OFDM based packets from wireless access point to mobile terminal. Secondly, positions of long preambles in the received IQ data are detected in the cross correlation process using a long preamble signal which is known between a transmitter and a receiver. Thirdly, the power delay profile is calculated by averaging of channel impulse responses which are estimated from received long preamble signals. Computer simulations confirm that the proposed scheme can be expected to achieve almost the same performance with PN sequence based measurement scheme.