Title :
Channel estimation in 802.11g in the presence of Bluetooth interference
Author :
Nawaz, Rab ; Sumei Sun
Author_Institution :
Inst. for Infocomm Res., A* STAR, Singapore, Singapore
Abstract :
In this paper, we provide a model for the Bluetooth (BT) interference and propose interference mitigation techniques at the channel estimation stage in IEEE 802.11g Wireless Local Area Network (WLAN) receivers. BT signal has been modelled as a narrow band tonal interference. Estimation of the BT interference by the Estimation of Signal Parameters using Rotational Invariance Techniques (ESPRIT) algorithm is proposed. The structure of the 802.11g preamble is exploited to define the Difference Terms (DTs). The 802.11g signal is subtracted out in DTs and the ESPRIT algorithm efficiency is improved by operating on non-colored noise environment. The reconstructed interference signal is subtracted from the received time domain signal before getting the Least Square (LS) channel estimates. The proposed `ESPRIT-LS´ algorithm is shown to outperform the simple LS channel estimation algorithm in terms of channel estimation Mean Squared Error (MSE) and the Bit Error Rate (BER) for a range of interference power levels.
Keywords :
Bluetooth; channel estimation; error statistics; least squares approximations; mean square error methods; radiofrequency interference; wireless LAN; BER; Bluetooth interference; ESPRIT-LS algorithm; IEEE 802.11g; MSE; WLAN receivers; bit error rate; difference terms; estimation of signal parameters using rotational invariance techniques; interference mitigation; least square channel estimates; mean squared error; narrow band tonal interference; noncolored noise environment; received time domain signal; reconstructed interference signal; wireless local area network; Bit error rate; Bluetooth; Channel estimation; Estimation; IEEE 802.11g Standard; Interference; OFDM;
Conference_Titel :
Signal Processing Conference, 2008 16th European
Conference_Location :
Lausanne