Title :
Transmit Diversity Scheme for TDS-OFDM Systems with Reduced Complexity
Author :
Dai, Linglong ; Wang, Zhaocheng ; Wang, Jintao ; Wang, Jun
Author_Institution :
Electron. Eng. Dept., Tsinghua Univ., Beijing, China
Abstract :
To reduce the complexity of existing transmit diversity solutions for time domain synchronous OFDM (TDS-OFDM), a simple transmit diversity scheme is proposed in this paper. The space shifted constant amplitude zero autocorrelation (CAZAC) sequence is used for time-domain channel estimation. Two types of flexible frame structures are investigated for cyclicity reconstruction of the received inverse discrete Fourier transform (IDFT) block. Regarding to channel estimation and cyclicity reconstruction, the complexity of the proposed scheme is only about 7% of the conventional solutions. With the penalty of small loss in spectral efficiency, the proposed scheme achieves better bit error rate performance over doubly selective channels, which is demonstrated by the simulation results.
Keywords :
OFDM modulation; channel estimation; correlation theory; discrete Fourier transforms; diversity reception; error statistics; inverse transforms; synchronisation; time-domain analysis; CAZAC sequence; OFDM; TDS; bit error rate; constant amplitude zero autocorrelation; cyclicity reconstruction; inverse discrete Fourier transform; time domain synchronous; time-domain channel estimation; transmit diversity scheme; Bit error rate; Channel estimation; Complexity theory; OFDM; Receivers; Transmitting antennas; Wireless communication;
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
DOI :
10.1109/icc.2011.5963450
