PBCH Demodulation Using Multi-Port Synchronization Signals
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Solution Overview
Problem
Current wireless communication systems require additional reference signals for demodulating broadcast channels, which increase signaling overhead and waste valuable spectrum resources that could be used for user data transmission.
Innovation Solution
Repurpose synchronization signals, such as the Secondary Synchronization Signal (SSS), to serve as demodulation references for downlink physical channels, allowing devices to demodulate PBCH transmissions without the need for separate reference signals from the base station, and convey transmit power information to determine pathloss for uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate reference signals are transmitted for demodulating broadcast channels, then demodulation accuracy is improved, but signaling overhead increases and spectrum resources are wasted
Solution Approach 1:
The synchronization signal is designed to serve dual purposes: (1) enabling time and frequency synchronization for system access, and (2) serving as a demodulation reference signal for broadcast channels. This multi-functionality eliminates the need for separate reference signals, reducing spectrum resource consumption while maintaining both synchronization and demodulation capabilities
Solution Approach 2:
The patent combines the functions of synchronization signal and reference signal into a single signal transmission. By merging these two previously separate functions into one unified signal structure, the system reduces signaling overhead and frees up spectrum resources for user data transmission while preserving demodulation accuracy
2Measurement precision
If separate reference signals are transmitted for demodulating broadcast channels, then demodulation capability is improved, but device complexity increases
Solution Approach 1:
The synchronization signal structure is designed to provide both synchronization information and channel reference information simultaneously. This reduces the number of separate signal processing chains needed at both transmitter and receiver, simplifying device complexity while maintaining full demodulation capability
Solution Approach 2:
The patent extracts the reference signal functionality from the separate reference signal transmission and integrates it into the synchronization signal structure. This extraction and integration reduces the overall system complexity by eliminating redundant signal processing components
Data Source
AI summary
Various features related to using a multi-port synchronization signal as reference for demodulating a multi-port broadcast channel are described. In an aspect, a synchronization signal, e.g., SSS, may be repurposed to serve as a demodulation reference for a downlink channel, e.g., PBCH, thereby obviating the need for a base station to send an additional reference signal for PBCH demodulation. A base station may select two or more logical antenna ports to transmit a synchronization signal, transmit the synchronization signal from the selected two or more logical antenna ports, and transmit information on the PBCH, from at least the selected two or more logical antenna ports. A UE may receive the synchronization signal from the two or more logical antenna ports at the base station, receive information on the PBCH from the at least the two or more logical antenna ports, and demodulate the information based on the received synchronization signal.