The computational complexity of FFT (Fast Fourier Transform) processing in an OFDM (Orthogonal Frequency Division Multiplex) based receiver is huge, with a large amount of receiver antennas. In LTE (Long Term Evolution) release 8, FFTs of different size are used for user data and random-access preambles requiring additional FFTs to be implemented for random-access reception.

Within the current paper, a 5G random-access preamble format is proposed based on a short sequence of the same length as the length of the OFDM symbols that are used for other uplink physical channels, such as user data, control signaling, and reference signals.

Full abstract in IEEE Xplore, DOI: 10.1109/GLOCOMW.2014.7063543


Henrik Sahlin, Stefan Parkvall, Mattias Frenne, Peter Nauclér

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Published 2014-12-08

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