Low Complexity Channel Estimation Method for IEEE 802.11p Vehicle Communications
نویسندگان
چکیده
Modern Intelligent Transportation System (ITS) uses the wireless communication technologies to increase the traffic safety and the transportation efficiency. However, the doppler effect and the multipath fading problems severely attenuate the received signal in the vehicle communication environments. Therefore, channel estimation is a critical issue should be solved properly to improve the Bit Error Rate (BER) performance at the receiver. Basically, ITS adopted the IEEE802.11p standard as its protocol and it defines the preamble with a specific format to conduct the channel estimation. Besides, four pilot subcarriers transmitted along with the Orthogonal Frequency Division Multiplexing (OFDM) system can also be used during the channel estimation. In this paper, a low computational complexity channel estimation method is proposed for the IEEE802.11p vehicle communications. The proposed method belongs to the frequency domain channel estimation and uses the preamble and pilot subcarriers defined in IEEE802.11p for the initial estimation and the time-varying adjustment for the channel. The method has the low-complexity advantage and a satisfactory BER performance compared with the related Cyclic Prefix (CP) based channel estimation method. Keywords—Channel Estimation; IEEE802.11p; OFDM
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