Mercury/waterfilling for fixed wireless OFDM systems

Angel Lozano, Antonia M. Tulino, Sergio Verdu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


Fixed wireless systems are designed to provide broadband connectivity to residential and enterprise customers. Since they typically operate in frequency-selective low-Doppler conditions, a preferred signalling choice is OFDM (orthogonal frequency-division multiplexing). In contrast with mobile systems, where the channel variations are often too rapid to be followed by the transmitter, in fixed wireless such variations can be accurately tracked. This provides the added flexibility of allocating power over the OFDM tones. For ideal Gaussian signals, the allocation of power over parallel channels is solved by the classical waterfilling policy. For the discrete constellations used in practice, however, waterfilling is no longer optimal. Rather, the power allocation that maximizes the mutual information is then given by the more general mercury/waterfilling policy. This paper illustrates the usance of mercury/waterfilling on frequency-selective OFDM channels with QAM constellations and it quantifies the extend to which conventional waterfilling curtails the mutual information.

Original languageEnglish (US)
Title of host publicationProceedings - 2006 IEEE Radio and Wireless Symposium
Number of pages4
StatePublished - 2006
Event2006 IEEE Radio and Wireless Symposium - San Diego, CA, United States
Duration: Jan 17 2006Jan 19 2006

Publication series

NameProceedings - 2006 IEEE Radio and Wireless Symposium


Other2006 IEEE Radio and Wireless Symposium
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • General Engineering


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