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On hardware implementation of multiuser multiplexing for SC-FDMA

: Ibing, A.; Jungnickel, V.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Vehicular Technology Society -VTS-:
2007 IEEE 66th Vehicular Technology Conference, VTC 2007-Fall. Vol. 4 : 30 September - 03 October 2007, Baltimore, Maryland, USA. Co-located with WiVEC, IEEE International Symposium on Wireless Vehicular Communications
Piscataway, NJ: IEEE, 2007
ISBN: 1-424-40263-8
ISBN: 1-424-40264-6
Vehicular Technology Conference (VTC Fall) <66, 2007, Baltimore/Md.>
International Symposium on Wireless Vehicular Communications (WiVEC) <1, 2007, Baltimore/Md.>
Fraunhofer HHI ()
fast fourier transforms; field programmable gate array; frequency division multiple access; Hardware-Software-Codesign

A simple algorithmic scheme is proposed which calculates multiple variable-length FFTs/IFFTs at once by a single fixed-length one. The algorithm exploits the fact that the transform of a periodic signal is a line spectrum, the linearity property of FFT/IFFT and the shift theorem. The overall algorithm complexity is higher than calculating separate variable- length transforms, but the ease of implementation makes the scheme well-suited for FPGA based rapid prototyping systems. Because in SC-FDMA systems multiple variable-length transforms are needed for different users, the algorithm can be used to implement multiuser multiplexing. The scheme can be applied to DFT/IDFT as well as FFT/IFFT implementations.