TY - GEN
T1 - Cyclic delay diversity with linear precoding technique adopted in OFDM systems
AU - Hui, Bing
AU - Chang, Kyung Hi
PY - 2009
Y1 - 2009
N2 - Cyclic delay diversity (CDD) is considered a simple approach to exploit the frequency diversity, to improve the system performance in orthogonal frequency division multiplexing (OFDM) systems. Also, the linear precoding technique can significantly improve the performance of communication systems by exploiting the channel state information (CSI). In order to achieve enhanced performance, we propose applying linear precoding to the conventional CDD-OFDM transmit diversity schemes over Rayleigh fading channels. The proposed scheme works effectively with the accurate CSI in time-division-duplex (TDD) OFDM systems with CDD, where the reciprocity is assumed instead of channel state feedback. For a bit error rate (HER) of 10-4 and the mobility of 3 km/h, simulation results show that a gain of 6 dB is achieved by the proposed scheme over both flat fading and Pedestrian A (Ped A) channels, compared to the conventional CDD-OFDM system. On the other hand, for a mobility of 120 km/h, a gain of 2.7 dB and 3.8 dB is achieved in flat fading and Vehicular A (Veh A) channels, respectively.
AB - Cyclic delay diversity (CDD) is considered a simple approach to exploit the frequency diversity, to improve the system performance in orthogonal frequency division multiplexing (OFDM) systems. Also, the linear precoding technique can significantly improve the performance of communication systems by exploiting the channel state information (CSI). In order to achieve enhanced performance, we propose applying linear precoding to the conventional CDD-OFDM transmit diversity schemes over Rayleigh fading channels. The proposed scheme works effectively with the accurate CSI in time-division-duplex (TDD) OFDM systems with CDD, where the reciprocity is assumed instead of channel state feedback. For a bit error rate (HER) of 10-4 and the mobility of 3 km/h, simulation results show that a gain of 6 dB is achieved by the proposed scheme over both flat fading and Pedestrian A (Ped A) channels, compared to the conventional CDD-OFDM system. On the other hand, for a mobility of 120 km/h, a gain of 2.7 dB and 3.8 dB is achieved in flat fading and Vehicular A (Veh A) channels, respectively.
KW - Cyclic delay diversity
KW - Frequency-division-duplex (FDD)
KW - Linear precoding
KW - OFDM
KW - Reciprocity
KW - TDD
UR - http://www.scopus.com/inward/record.url?scp=67649890524&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:67649890524
SN - 9788955191387
T3 - International Conference on Advanced Communication Technology, ICACT
SP - 487
EP - 492
BT - 11th International Conference on Advanced Communication Technology, ICACT 2009 - Proceedings
T2 - 11th International Conference on Advanced Communication Technology, ICACT 2009
Y2 - 15 February 2009 through 18 February 2009
ER -