Wireless LAN White Papers

Multilevel Codes for OFDM-Like Modulation Over Underspread Fading Channels

Overview This paper studies the problem of modulation and coding for doubly dispersive, i.e., time and frequency selective fading channels. Using the recent result that under-spread linear systems are approximately diagonalized by biorthogonal Weyl-Heisenberg bases, it arrives at a canonical formulation of modulation and code design. For coherent reception with maximum likelihood decoding, it derives the code design criteria as a function of the channel's scattering function. The paper uses ideas from generalized concatenation to design multilevel codes for this canonical channel model. These codes are based on partitioning a constellation carved out from the integer lattice.

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PublisherUniversity of Illinois File FormatPDF
Date PublishedMay 2006
FormatWhite Papers   
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