A novel channel estimation method based on compressive sensing for OFDM/OQAM systems

作者：Liu Xiaoming; Cai Ziwei^*; Jia Ali; Wang Pai; Ou Jinglan

来源：Journal of Computational Information Systems, 2013, 9(15): 5955-5963.

DOI：10.12733/jcis7100

• Approximation methods
• Bit error ratio (BER)
• Channel estimation method
• Channel impulse response
• Compressive sensing
• Ofdm/oqam
• Orthogonal matching pursuit
• Orthogonality properties

OFDM/OQAM is a special multi-carrier modulation which is proposed as an alternative to conventional OFDM with cyclic prefix for its higher spectrum efficiency and robustness to frequency offset. However, the orthogonality property of OFDM/OQAM only holds in the real field. Therefore, the channel estimation (CE) methods for CP-OFDM are inefficient for OFDM/OQAM. Inspired by the theory of compressive sensing (CS), we derive an improved interference approximation method (IIAM) which reconstructs channel impulse response by utilizing orthogonal matching pursuit based on interference approximation CE method. Moreover, we analyze the CE method which only uses pair of real pilots (POP) that offers higher spectrum efficiency, and the novel CE method using the CS theory based on POP (CSPOP) is proposed. The simulation results prove that the performance of estimator utilizing the CS theory gets remarkable improvement compared to that of the original CE method. The bit error ratio performance of OFDM/OQAM depending on the novel CE method is close to that of the system based on perfect estimator.

• 出版日期2013