Adaptive Downlink Waveforms for Phase Noise and PAPR Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently adapting downlink waveforms to mitigate phase noise and high peak-to-average power ratio (PAPR) at high frequencies, particularly in the 52.6 GHz band, leading to system degradation.
Innovation Solution
Adapting downlink waveforms dynamically or semi-statically to include multi-carrier or single-carrier waveforms, or combinations thereof, for synchronization signal block and physical downlink channel transmissions, with phase noise power measurement reports and uplink control signaling to adjust waveform types, and modifying channel structures to support discrete Fourier transform spread orthogonal frequency demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic prefix is appended to each orthogonal cover code (OCC) sequence in OTFS modulation, then time-domain orthogonality is maintained, but overhead increases and time resources are consumed
Solution Approach 1:
The patent extracts the cyclic prefix function from individual OCC sequences and implements it at the resource grid level instead. By removing the redundant cyclic prefix appending operation from each OCC sequence while maintaining the resource grid structure, the system achieves the same orthogonality protection without the additional overhead
Solution Approach 2:
The patent merges the cyclic prefix function into the resource grid construction process itself. Instead of separately appending cyclic prefixes to each OCC sequence, the resource grid is designed to inherently provide the necessary time-domain separation and orthogonality, combining multiple functions into a unified structure
2Reliability
If downlink and uplink use different waveform types (OFDM and SC-FDMA respectively), then performance requirements are met, but device complexity increases due to separate waveform processing
Solution Approach 1:
The patent makes the resource grid waveform universal for both downlink and uplink transmissions. The same resource grid construction method, which inherently provides the necessary orthogonality and time-domain properties, is applied to both directions, eliminating the need for separate OFDM and SC-FDMA processing chains while meeting performance requirements for both
Solution Approach 2:
The patent changes the fundamental parameter of waveform type from direction-specific (OFDM for downlink, SC-FDMA for uplink) to direction-agnostic (resource grid-based waveform for both). This parameter change allows a single unified processing approach to serve both transmission directions, reducing device complexity
Data Source
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AI summary
Apparatuses, methods, and systems are disclosed for transmission using an adapted downlink waveform type. One method (3400) includes dynamically or semi-statically adapting (3402) a downlink waveform type at a network unit, wherein: the downlink waveform type comprises a multi-carrier waveform, a single-carrier waveform, or a combination thereof; and the downlink waveform type is for a transmission comprising a synchronization signal block transmission, a physical downlink scheduled channel transmission, or a combination thereof. The method (3400) includes transmitting (3404) the transmission using a downlink waveform pattern comprising the downlink waveform type.