Time domain implementation of space-time/frequency block codes for OFDM systems

A Lodhi, F Said, M Dohler, A H Aghvami

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Spatial diversity is a widely applied technique for enhancing the wireless system performance, since it greatly reduces the detrimental effects of multipath fading. Orthogonal space-time block codes are considered to be a good choice for spatial diversity, as they provide full diversity without any channel state information at the transmitter. The standard frequency domain application of these block codes for OFDM-based systems requires multiple inverse fast Fourier transform operations per OFDM symbol. This increases the system computational load, which grows with the increasing number of transmit antennas and sub-carriers. By using well-known properties of the discrete Fourier transform, we propose a time domain encoding of these codes, thereby requiring only one transformation per OFDM symbol. The proposed encoding strategy significantly reduces the computational load and hence facilitates implementation
Original languageEnglish
Pages (from-to)633 - 638
Number of pages6
JournalIEE Proceedings in Communications
Issue number5
Publication statusPublished - 2006


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