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Theoretical Analysis of Interference Cancellation System Utilizing an Orthogonal Matched Filter and Adaptive Array Antenna for MANET

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Department of Information and Communication Engineering, Faculty of Computer Science and Systems Engineering, Okayama Prefectural University, Okayama 719-1197, Japan
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Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan
*
Author to whom correspondence should be addressed.
J. Sens. Actuator Netw. 2019, 8(3), 48; https://doi.org/10.3390/jsan8030048
Received: 2 August 2019 / Revised: 8 September 2019 / Accepted: 12 September 2019 / Published: 17 September 2019
This study provides a mathematical model and theoretical analysis of an interference cancellation system combining an orthogonal matched filter (OMF) and adaptive array antenna that is called the extended OMF (EOMF). In recent years, an increase in the number of applications of mobile ad hoc networks (MANETs) is expected. To realize a highly reliable MANET, it is essential to introduce a method for cancelling the interference from other nodes. This research focuses on a scheme based on Code Division Multiple Access (CDMA) that enables simultaneous multiple access and low latency communication. However, there are problems with deteriorating performance due to the near–far problem and the increase in the amount of interference as the number of users increases. Additionally, another problem is that the spreading sequence of each user is unknown in a MANET. The OMF is expected to be a solution to these problems. The OMF performs interference cancellation by generating and subtracting a replica of the interference signal that is contained in the received signal. However, the OMF may generate an incorrect replica in the near–far problem. The EOMF compensates for the OMF’s weakness by combining the OMF with an adaptive array antenna. In this research, optimal parameters are derived from mathematical modelling and theoretical analysis of the EOMF. Specifically, the optimal weight vector and the minimum mean squared error that allow the adaptive algorithm to converge are derived and obtained from the numerical results. View Full-Text
Keywords: interference cancellation; orthogonal matched filter; adaptive array antenna; CDMA; theoretical analysis interference cancellation; orthogonal matched filter; adaptive array antenna; CDMA; theoretical analysis
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Harada, S.; Takabayashi, K.; Kobayashi, T.; Sakakibara, K.; Kohno, R. Theoretical Analysis of Interference Cancellation System Utilizing an Orthogonal Matched Filter and Adaptive Array Antenna for MANET. J. Sens. Actuator Netw. 2019, 8, 48.

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