Robustness of Modified FBMC-SS Against Partial-Band Noise-Like Interference

Simple item page
dc.contributor.authorBarrett, Christopher Silasen
dc.contributor.committeechairGaeddert, Joseph Danielen
dc.contributor.committeememberTalty, Timothy Josephen
dc.contributor.committeememberMichaels, Alan J.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2025-08-13T08:01:25Zen
dc.date.available2025-08-13T08:01:25Zen
dc.date.issued2025-08-12en
dc.description.abstractAs spectrum has grown more congested, there has been a greater emphasis on interference-robust low-signal-to-noise ratio (SNR) waveforms capable of operating under interference from other users and under hostile jamming. Traditional robust waveforms have limitations of only being robust against certain types of partial-band interference. A modification on the existing scheme of filterbank multicarrier spread-spectrum (FBMC-SS) is proposed that pseudo-randomly maps spread data chips to different time and frequency locations within a packet. The intended effect of this is to allow the decoder to consider and notch noise-like interference independent of its location in time and frequency. Additionally, the effects of this interference on joint frequency, time, and phase estimation are considered. The Cramér- Rao variance bounds (CRVBs) are derived for joint estimation of these values for arbitrary locations of pilots that are and are not under interference. These CRVBs are considered for different pilot mapping schemes and different interference and jamming scenarios, finding that a pseudorandom uniform pilot mapping scheme is optimal for resistance to interference and jamming.en
dc.description.abstractgeneralAs the number of devices communicating wirelessly increases, the radio frequency spectrum used by these devices is becoming more crowded. As a result, there has been a significant push for interference-resistant communications methods that also result in minimal interference on other users. One solution to this is through the use of waveforms that can operate with a power less than the power of the thermal noise generated by a receiver. A problem arises, however, when either interference from other users or jamming is encountered. While many of these waveforms will have some inherent resistance to interference, this resistance is often situational and depends on the nature of the interference. Therefore, this thesis proposes a waveform that pseudorandomly maps data uniformly throughout time and frequency to ensure that, for decoder performance, any interference present will be defined only by its rate over the packet and its power, not its location. It is found in this thesis that in processing at the receiver, it is optimal to either filter out all or none of any section of signal containing interference prior to decoding. Additionally, an optimal scheme of pseudorandomly uniformly distributing known pilot symbols throughout the packet for joint frequency, timing, and phase offset estimation under noise-like interference is determined by comparing the lower bounds on the variance for unbiased estimators for different pilot mapping schemes.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:44458en
dc.identifier.urihttps://hdl.handle.net/10919/137476en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectfilterbank multi-carrier communicationsen
dc.subjectinterference mitigationen
dc.subjectspread-spectrum communicationsen
dc.subjectCramer-Rao variance bounden
dc.titleRobustness of Modified FBMC-SS Against Partial-Band Noise-Like Interferenceen
dc.typeThesisen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Name:
Barrett_CS_T_2025.pdf
Size:
26.23 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses