PSS and SSS Signal Synchronization in Wideband Wireless Systems
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Solution Overview
Problem
Conventional wireless communication systems face challenges in achieving efficient one-shot detection of primary synchronization signals (PSS) and secondary synchronization signals (SSS) due to limitations in signal transmission and processing, leading to prolonged initial acquisition times and inadequate noise reduction, especially in listen-before-talk environments.
Innovation Solution
The system improves PSS and SSS detection by transmitting both signals in a single subframe, allowing for coherent combination and reduced noise, and encodes cell identifier groups and subframe offsets in the SSS sequence to enhance detection probability and reduce acquisition duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PSS and SSS are transmitted in separate subframes, then the detection process is simpler, but the acquisition time is prolonged and noise reduction is inadequate
Solution Approach 1:
The patent combines PSS and SSS transmissions into a single subframe, allowing both signals to be transmitted simultaneously rather than in separate subframes. This merging approach reduces the acquisition time by enabling one-shot detection of both signals, while the patent manages the increased complexity through specific signal design and processing techniques
2Quantity of substance
If multiple subframes are used for signal transmission, then more signals can be transmitted, but the buffer hardware requirements increase
Solution Approach 1:
The patent merges multiple signal transmissions (PSS and SSS) into a single subframe, which eliminates the need for extensive buffer hardware that would be required to store and process signals from multiple separate subframes. This approach maintains the quantity of signals transmitted while reducing the hardware complexity
3Reliability
If conventional transmission methods are used, then the system is easier to implement, but the one-shot detection probability is reduced
Solution Approach 1:
The patent changes key transmission parameters by transmitting both PSS and SSS in the same subframe with specific timing relationships and frequency configurations. This parameter change improves the one-shot detection probability by allowing simultaneous reception and processing of both signals, while the improved detection performance justifies the increased processing complexity
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described for synchronization for wideband coverage enhancement. A user equipment (UE) may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a subframe. In one example, the SSS may be received in a symbol that is after a symbol in which the PSS is received, and after a set of symbols in which a set of other synchronization signals is received. In another example, the PSS may be received in each of a first plurality of consecutive symbols, and the SSS may be received in each of a second plurality of consecutive symbols, wherein the second plurality of consecutive symbols is after the first plurality of consecutive symbols within the subframe. The UE may synchronize with a base station based at least in part on the PSS and the SSS. Numerous other aspects are provided.