Blind Receiver with Joint Channel Shortening, CFO Compensation and Data Detection for 5G MIMO SPC System

Abstract

The upcoming fifth-generation (5G) systems needs to provide several services with short packets. Due to the property of short packet communication (SPC), reducing the length of cyclic prefix (CP) and length of pilot is an important study. In Darsea et al. [D. Darsea, G. Geli, and F. Verd, “Joint blind channel shortening and compensation of transmitter I/Q imbalances and CFOs for uplink SC-IFDMA systems,” Phys. Commun., Vol. 11, pp. 25–35, Jun. 2014], a blind receiver with joint CFO (carrier frequency offset) compensation and channel shortening was proposed for the system with single transmitted antenna and single received antenna. In this paper, we extend the scheme in Darsea et al. (2014) to the multiuser multi-input multi-output (MU-MIMO) environment. We employ the blind system in the receiver which does not need pilot and reduce the length of CP as short as possible. The methods of channel shortening and CFO compensation had been proposed individually. If the duration of CP is not sufficient, we can use equalizer to shorten the channel. The proposed receiver is with four-stage structure. At first, the blind shortening of channel impulse responses (CIRs) is performed. Secondly, the joint estimation and compensation of the CFOs is derived. The third step of the receiver implements signal-to-noise ratio (SNR) maximization. Finally, the fourth stage performs blind detection with constant modulus algorithm (FLOS-CMA).

KEYWORDS:

• Blind receiver
• Cyclic prefix
• Short-packet communications

Additional information

Notes on contributors

Ye-Shun Shen

Ye-Shun Shen received the PhD degree in communication engineering from the National Cheng Kung University, Tainan, Taiwan, in 2004. From 1993 to 2005, he has been with Chunghwa Telecom, where he was a senior engineer. Since August 2005, he has been with the Department of Aeronautical Engineering, National Formosa University, Huwei Township, Yunlin County, Taiwan. His research interests include spread spectrum communications, wireless access technologies, and coding theory. E-mail: [email protected]

Fang-Biau Ueng

Fang-Biau Ueng received the PhD degree in electronic engineering from the National Chiao Tung University, Hsinchu, Taiwan in 1995. From 1996 to 2001 he was with National Space Program Office (NSPO) of Taiwan as an associate researcher. From 2001 to 2002 he was with Siemens Telecommunication Systems Limited (STSL), Taipei, Taiwan, where he was involved in the design of mobile communication systems. Since February 2002, he has been with the Department of Electrical Engineering, National Chung Hsing University, Taichung, Taiwan. His areas of research interest are wireless communication and adaptive signal processing.

Yun-Yu Li

Yun-Yu Li was born in Taipei, Taiwan, in 1991. He received the BSc degree in electrical engineering from Chang Gung University (CGU), Taoyuan, Taiwan, in 2014 and the MSc degree from the National Chung Hsing University (NCHU), Taichung, Taiwan, in 2016. He is a member of the Communications System Laboratory, National Chung Hsing University (NCHU). His research interest is focused on MIMO SC-IFDMA and LTE communication systems. E-mail: [email protected]