CDMA Mobile Radio Design
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
A software-defined communications baseband design
IEEE Communications Magazine
Interference considerations for the time division duplex mode of the UMTS Terrestrial Radio Access
IEEE Journal on Selected Areas in Communications
Active interference suppression in CDMA overlay systems
IEEE Journal on Selected Areas in Communications
Channel tracking for RAKE receivers in closely spaced multipath environments
IEEE Journal on Selected Areas in Communications
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In a multi-path environment where the path delay of multi-path structures are less than a chip delay, multi-path interference contributions significantly impair the received signal. Even in high signal-to-noise ratio situations if the time delay between two paths is one quarter of a chip the error rate is significantly higher. In this paper we describe a multi-path interference cancellation method for closely spaced multi-path delays suitable for software implementation[1]. For closely spaced path delays, we derive a system of equations that improves the symbol estimate. For simplicity, but without loss of generality, the mathematical description is derived for a single user, with AWGN. The noise term includes inter-cell interference and thermal noise coming from the front end of the receiver. The described multi-path cancellation method is applicable to closed spaces or very dense urban areas at 2 Mbps data rate.