Channel Estimation for PBCH Symbols in Time Division Multiplexed SSBs
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining channel estimation for physical broadcast channel symbols in synchronization signal blocks with time division multiplexed symbols, particularly in high-frequency bands where phase noise is high and single carrier frequency domain communications may impair channel estimation.
Innovation Solution
The method involves determining channel estimations for primary synchronization signal, secondary synchronization signal, and demodulation reference signal symbols, and using these to interpolate or extrapolate the channel estimation for the physical broadcast channel symbol, thereby improving demodulation accuracy without relying on DMRS in the PBCH symbol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS symbols are included in PBCH for channel estimation, then demodulation accuracy is improved, but power consumption and resource usage increase
Solution Approach 1:
The patent extracts the channel estimation function from DMRS symbols in PBCH and relocates it to synchronization signal blocks (SSBs). By using PSS and SSS symbols for channel estimation, the system removes the need for DMRS in PBCH, thereby reducing power consumption and resource usage while maintaining demodulation accuracy.
Solution Approach 2:
The patent makes synchronization signals (PSS and SSS) serve dual functions: synchronization and channel estimation. This multi-functionality eliminates the need for separate DMRS symbols in PBCH, reducing overall resource consumption while maintaining the ability to perform accurate channel estimation for PBCH demodulation.
2Productivity
If single carrier frequency domain communication is used, then spectral efficiency is improved, but channel estimation accuracy deteriorates in high-frequency bands
Solution Approach 1:
The patent introduces synchronization signal blocks (SSBs) as intermediary structures that carry both synchronization signals and channel estimation information. SSBs act as mediators between the single carrier frequency domain communication system and the requirement for accurate channel estimation in high-frequency bands, enabling the system to maintain both spectral efficiency and estimation accuracy.
3Measurement precision
If phase noise is reduced in high-frequency bands, then channel estimation accuracy is improved, but this requires advanced signal processing that increases complexity
Solution Approach 1:
The patent performs channel estimation using PSS and SSS symbols before PBCH demodulation. By preliminarily establishing channel estimates from synchronization signals, the system reduces the need for complex signal processing during PBCH demodulation, thereby maintaining accuracy while managing complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, via a single carrier communication, a synchronization signal block (SSB) with time division multiplexed symbols that include a physical broadcast channel (PBCH) symbol and one or more of a primary synchronization signal (PSS) symbol, a secondary synchronization signal (SSS) symbol, or a demodulation reference signal (DMRS) symbol. The UE may demodulate the PBCH symbol using a channel estimation for the PBCH symbol that is based at least in part on one or more channel estimations of the PSS symbol, the SSS symbol, or the DMRS symbol. Numerous other aspects are described.