Title :
Effects of Virtual Carriers of Channel Estimation for OFDM Systems with Transmit Diversity
Author :
Wang, Yi ; Tan, Bo ; Tao, Xiaofeng ; Zhang, Ping
Author_Institution :
Key Lab. of Universal Wireless Commun., BUPT, Beijing
Abstract :
In this paper, the performance of discrete Fourier transform (DFT) based channel estimation (CE) for orthogonal frequency division multiplexing (OFDM) systems with transmit antenna diversity is analyzed. Conventional DFT-based CE suffers from the dispersive distortion of an estimated channel impulse response (CIR) due to the existence of virtual carriers (VCs). We analyze the mean squared error (MSE) performance and provide a concise expression which reveals the leakage effect due to VCs. Further, analytical expression for bit error rate (BER) with the effect of VCs is also derived. Simulation results illustrate the accuracy of the theoretical analysis.
Keywords :
OFDM modulation; channel estimation; discrete Fourier transforms; diversity reception; transient response; OFDM systems; bit error rate; channel estimation; channel impulse response; discrete Fourier transform; mean squared error; orthogonal frequency division multiplexing; transmit antenna diversity; transmit diversity; virtual carriers; Bit error rate; Channel estimation; Discrete Fourier transforms; Dispersion; Frequency domain analysis; OFDM; Performance analysis; Phase shift keying; Transmitting antennas; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.244
