Partial Resource Grid Loading for Reliable Multi-Waveform Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high reliability and reducing latency and power consumption without requiring channel state information (CSI) at the transmitter, particularly in doubly dispersive channels that cause cross-interference among data symbols.
Innovation Solution
A wireless communication system that employs partial loading of data symbols onto two-dimensional resource grids using waveforms like OTFS, OTSM, and OFDM, with controlled sparsely loaded data symbols and zero symbols in empty grid points, reducing cross-interference and latency, and utilizing cooperative receivers for demodulation without CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full loading of data symbols is used in two-dimensional resource grids, then spectral efficiency is improved, but cross interference between data symbols increases due to doubly dispersive channels
Solution Approach 1:
The patent applies partial loading by transmitting fewer data symbols than the total available grid points in the two-dimensional resource grid. By deliberately leaving some grid points empty (partial action), the system reduces cross-interference between data symbols caused by doubly dispersive channels while maintaining acceptable spectral efficiency through optimized symbol placement and spacing.
2Reliability
If precoding based on channel state information is used, then reliability is improved, but feedback overhead and system complexity increase
Solution Approach 1:
The patent extracts and removes the requirement for channel state information feedback from the system. By designing a transmission scheme that does not depend on CSI at the transmitter, the patent eliminates the feedback overhead and associated complexity while maintaining improved reliability through partial loading and optimized waveform design.
3Reliability
If precoding with historical channel prediction is used, then reliability is improved, but latency increases due to training and channel tracking
Solution Approach 1:
The patent removes the need for historical channel prediction, training sequences, and channel tracking operations. By designing a system that achieves improved reliability without relying on channel state information or predictive algorithms, the patent eliminates the associated latency overhead while maintaining error performance.
4Reliability
If data symbols are spaced apart with zeros in gaps, then cross interference is reduced, but spectral efficiency decreases
Solution Approach 1:
The patent applies partial loading by deliberately leaving some grid points empty with zero symbols, creating spacing between data symbols. This partial action reduces cross-interference and provides SNR gain while the patent optimizes the loading factor to balance spectral efficiency, ensuring that the reduction in symbol density does not excessively impact overall system productivity.
Data Source
AI summary
A wireless communication system for enhanced reliability of wireless communication and reducing peak power in wireless data transmission across different waveforms comprising transmitter modules coupled to waveform modulators including waveform two-dimensional resource or data grids representative of a signal processing domain for transmitting data bit bearing symbols across varied waveforms under controlled sparsely/partially loading of fewer modulated data symbols of the available grid points of a larger two-dimensional resource or data grid for transmission as spaced fewer data symbols with loading zero symbols at remaining empty grid points. The modulated data symbols under controlled sparsely/partially loading including said fewer modulated data symbols being allocated in the resource or data grid and distanced there between based on a factor for partial loading and full number of symbols accommodable in the resource or data grid to reduce cross interference amongst symbols and minimize error rate.