Title :
Interference-avoidance pilot design using ZCZ sequences for multi-cell MIMO-OFDM systems
Author :
Rongqing Zhang ; Xiang Cheng ; Meng Ma ; Bingli Jiao
Author_Institution :
Sch. of Electron. Eng. & Comput. Sci., Peking Univ., Beijing, China
Abstract :
In this paper, we propose an interference-avoidance pilot design scheme using Zero-Correlation Zone (ZCZ) sequences for multi-cell MIMO-OFDM systems. In the proposed scheme, the ZCZ sequences from the same family set are designed as the time-domain (TD) pilot symbols and are Code-Division Multiplexing (CDM) for different transmit antennas in adjacent cells. Due to the perfect auto-correlation and cross-correlation properties of the ZCZ sequences within a certain correlation zone that is designed equal to or a little larger than the Cyclic Prefix (CP) length, the inter-cell interference of the pilot symbols can be effectively eliminated by utilizing a time-domain correlation-based channel estimation method. Simulation results show that the proposed scheme achieves near optimal normalized Mean Square Error (MSE) performance of channel estimation in a multi-cell environment.
Keywords :
MIMO communication; OFDM modulation; antenna arrays; channel estimation; code division multiplexing; cyclic codes; mean square error methods; radiofrequency interference; time-domain analysis; transmitting antennas; CDM; CP length; MSE performance; TD pilot symbol; ZCZ sequences; code-division multiplexing; cyclic prefix length; intercell interference; interference-avoidance pilot design; multicell MIMO-OFDM system; optimal normalized mean square error performance; time-domain correlation- based channel estimation method; time-domain pilot symbols; transmitting antennas; zero-correlation zone sequence;
Conference_Titel :
Global Communications Conference (GLOBECOM), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-0920-2
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2012.6503922
