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Wideband Signal Analysis

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  • Author: Dr. St. Heuel, Dr. S Michael , M. Kottkamp
Wideband radiofrequency signals become more and more important and omnipresent. While GSM systems use 200 kHz bandwidth per channel, UMTS (3G) occupies 5 MHz and LTE (4G) makes use of up to 20 MHz. The carrier aggregation (CA) feature in LTE-Advanced already allows aggregating up to five LTE component carriers and 32 CA was proposed as further enhancement in 3GPP Release 13. IEEE Wifi networks had an evolution, where 802.11n makes use of up to 40 MHz and 802.11ad up to 1.76 GHz or even 2.16 GHz with guard bands. Last but not least the recently started research on 5G includes, among other technology components, the use of wideband signals (up to 2GHz) in the cm- and mm-wave frequency range. Propagation conditions and channel impulse response for cellular applications is largely unexplored at cm- and mm-wave frequencies. For channel sounding high bandwidth translates into high resolution of multipath components, which adds to the need for wideband signal analysis.
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