DM-RS Time-Domain Allocation for High-Frequency Channel Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in channel estimation and data demodulation at high frequencies due to the sensitivity of existing waveforms like CP-OFDM to phase noise and high peak-to-average power ratio, which limits cell coverage and increases UE power consumption, especially when using single carrier waveforms like SC-FDE that require redesign of reference signals for accurate channel estimation and symbol timing.
Innovation Solution
The implementation of DM-RS types with time-domain resource allocation, including new DM-RS configurations such as Type 3 and Type 4, which involve periodic insertion of DM-RS in the time domain, variable DM-RS block lengths, and increased density to support channel estimation and synchronization, allowing for more accurate channel tracking and reduced computational complexity in receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CP-OFDM waveform is used for high frequency communication, then data transmission capability is improved, but phase noise sensitivity increases and cell coverage is limited
Solution Approach 1:
The patent changes the fundamental waveform parameter from multi-carrier CP-OFDM to single-carrier SC-FDE, which fundamentally alters the spectral characteristics and phase noise behavior. This parameter change enables better phase noise resilience while maintaining high data transmission capability through single carrier modulation with frequency domain equalization
Solution Approach 2:
The patent replaces the traditional time-domain channel estimation approach with frequency-domain channel estimation and equalization. This substitution changes the processing mechanism from temporal to spectral domain operations, enabling more robust channel tracking in high-frequency environments with phase noise
2Productivity
If CP-OFDM waveform is used, then data transmission capability is improved, but peak-to-average power ratio increases and UE power consumption increases
Solution Approach 1:
The patent changes the modulation waveform from multi-carrier CP-OFDM to single-carrier SC-FDE, which fundamentally reduces the peak-to-average power ratio. This parameter change in waveform structure enables more efficient power amplification and reduces UE power consumption while maintaining data transmission capability
3Reliability
If SC-FDE single carrier waveform is used, then phase noise sensitivity is reduced, but reference signal design complexity increases for accurate channel estimation
Solution Approach 1:
The patent segments the channel estimation process into distinct phases: pilot-based initial estimation, DM-RS tracking estimation, and frequency domain equalization. This segmentation of the estimation process into modular components reduces overall design complexity while maintaining accuracy in SC-FDE systems
Solution Approach 2:
The patent introduces demodulation reference signals (DM-RS) as an intermediary element that facilitates accurate channel estimation in SC-FDE systems. These dedicated reference signals act as mediators between the transmitted signal and the channel, enabling robust channel tracking without overly complicating the overall reference signal design
4Measurement precision
If DM-RS density is increased for accurate channel estimation, then channel tracking accuracy is improved, but computational complexity in receivers increases
Solution Approach 1:
The patent replaces time-domain channel estimation and equalization with frequency-domain approaches. This substitution reduces computational complexity by leveraging efficient frequency-domain algorithms while maintaining or improving channel tracking accuracy through the use of DM-RS in the frequency domain
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for DM-RS types with time-domain resource allocation. An apparatus (1200) includes a transceiver (1225) and a processor (1205) that is configured to cause the apparatus (1200) to receive a demodulation reference signal (“DM-RS”) configuration from a network, receive a DM-RS sequence within the block duration of the single carrier waveform according to the received DM-RS configuration, receive a data sequence that is quasi-collocated with an associated DM-RS resource, and demodulate the received data sequence using the DM-RS sequence.