Space-frequency precoding for an OFDM based system exploiting spatial and path correlation

Jan Hansen, Eunchul Yoon, Majid Emami, Arogyaswami Paulraj

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


We investigate the capacity behavior of an OFDM wireless link for the frequency selective MIMO channel with correlated paths. The derivation is based on a particular channel model that characterizes path correlation as well as spatial correlation. As in the case of spatial correlation, path correlation can reduce capacity. If there is no channel knowledge at the transmitter, the capacity reduction of an OFDM based system due to path correlation can be explained in terms of the effective SNR at each tone. With spatial and path correlation information at the transmitter, we derive the optimal space-frequency precoder at every tone by numerical optimization techniques. We propose a sub-optimal precoding scheme with lower complexity which leads to a tight lower bound of the capacity of the OFDM system.
Original languageEnglish
Title of host publicationIEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)
Publication statusPublished - 3 Dec 2004
Externally publishedYes
Event2004 IEEE Global Telecommunications Conference: Globecom 2004 - Dallas, TX, United States
Duration: 29 Nov 20043 Dec 2004


Conference2004 IEEE Global Telecommunications Conference
Abbreviated titleGlobecom 2004
Country/TerritoryUnited States
CityDallas, TX

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