Channel Estimation and Equalization in Wireless ATM

Wireless ATM has attracted considerable research attention in recent years because of its promise of delivering multimedia traffic ubiquitously to mobile users, and its seamless connection to the (land-line) broadband ISDN. However, originally designed for time-invariant and high-quality physical links (such as fiber-optic networks), implementations of ATM in a wireless environment face several challenges. Of particular significance is the ability to provide a reliable physical layer without excessive overhead. In this paper, we consider channel estimation and equalization problems in wireless ATM. Our goal is to eliminate or greatly reduce the transmission of training signals associated with channel equalization. The proposed approach, dubbed Protocol-Aided Channel Equalization (PACE), exploits simultaneously the structure of the ATM cell, the medium access control (MAC), and information-carrying data symbols.

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