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Waveform optimization using trapezoidal pulses for 5G random access with short message support

: Wunder, G.; Gorgani, S.A.; Ahmed, S.S.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Signal Processing Society:
IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2015 : Stockholm, Sweden, 28 June - 1 July 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-1932-1
ISBN: 978-1-4799-1931-4
International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) <16, 2015, Stockholm>
Fraunhofer HHI ()

It is well-known that sporadic traffic will be an increasing demand in the 5G market. Obviously, bulky synchronization procedure of the current 4G LTE cellular systems is not a viable option. Transmission of control signaling and payload ldquoin one shotrdquo in physical layer random access channel is an interesting direction. A major challenge is to cope with highly asynchronous access as well as high carrier frequency offsets of low-cost IoT devices. We address this challenge by using a waveform design approach based on a (tail-biting) bi-orthogonal frequency division multiplexing approach (at non-critical density). More specifically, we introduce a 2-parameter trapezoidal pulse family and investigate their properties both by analysis and simulations. In particular, we reveal surprising favorable properties like excellent time domain localization measured in terms of their L 1-norm and relate this to ldquoextremerdquo cases like the triangle pulse and the sinc pulse which appear as special cases of the trapezoidal family.