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[EN] A new transmission scheme for OFDM systems that uses the odd discrete Fourier transform to provide frequency diversity gain is proposed. Odd DFT allows the transmission of data subcarriers in frequencies that are centred between those employed by the traditional DFT. This fact is exploited to transmit data subcarriers on the group of frequencies that gives better performance using either traditional DFT or odd DFT. As an example, by using this approach a diversity gain up to 5.3 dB at a BER of 10-4 in a typical indoor channel model can be achieved. © 2011 The Institute of Electronics, Information and Communication Engineers., This work was supported by the Spanish Ministerio de Ciencia e Innovacion under grant TEC2008-06787.

This paper presents a software tool to design intermediate frequency and baseband digital transceivers on FPGA. Main characteristic of this tool is that an ad-hoc interpolation or decimation filter chain composed by CIC, polyphase, pulse shaping, matched filters and a CORDIC-based or ROM-based mixer can be selected. The tool allows the software radio designer to develop downconverters and upconverters and, finally, automatically to generate the VHDL code to implement the system on Xilinx FPGAs.