Internumerology interference mitigation techniques for mixed numerology ofdm in 5g and beyond systems

Abstract

The envisaged services and requirements for 5th generation (5G) and beyond 5G newline(B5G) wireless networks are manifold higher compared to previous generations and newlineare broadly categorized into three: enhanced mobile broadband (eMBB), massive newlinemachine type communications (mMTC) and ultra reliable and low latency communications newline(uRLLC). To support the challenges imposed by these diverse services and newlinerequirements, standardization body has introduced mixed numerology in 5G new radio newline(NR) specification where each service is allotted a specific numerology depending newlineon its requirements. However, multiplexing different numerologies in the frequency newlinedomain inevitably introduces inter-numerology interference (INI) due to the fact that newlinethe subcarrier orthogonality possessed by single numerology no longer holds which newlineseverely deteriorates the system performance. To mitigate INI, inserting guard band newlineis a simple solution, but at the cost of degraded spectral efficiency. Hence, the major newlineobjective of the thesis is to develop spectrally efficient INI mitigation/cancellation newlinetechniques for supporting multiple services in mixed numerology OFDM systems. newlineOFDM is finalized as the underlying waveform for 5G NR with some spectral newlineconfinement techniques on top of the base waveform to reduce INI. This motivated newlineto propose a computationally efficient approach with a combination of filtering and newlinewindowing technique as the first contribution. Filtering is done at the transmitter side, newlinewhile less complicated windowing is adopted at the receiver side to offer sufficient newlineINI reduction in a reasonably low complex way. For low powered devices, the newlineproposed approach provides a better solution to overcome the effect of INI with