Dynamic Hybrid UW and CP Symbol Formats for 5G
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently generating hybrid symbols that incorporate both cyclic prefixes (CP) and guard intervals (GI), which are essential for maintaining signal integrity and adapting to varying delay spreads and channel conditions.
Innovation Solution
The generation of hybrid symbols that include a CP portion, a data portion, and at least one of a header or tail portion, where the CP is located at the beginning and includes predefined samples from the end, and the header or tail portions are strategically placed to enhance waveform generation and transmission, allowing for adaptive GI lengths and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hybrid symbol format incorporating both CP and GI is implemented, then adaptability to varying delay spreads and channel conditions is improved, but device complexity increases due to the need to generate and process hybrid symbols with multiple portions
Solution Approach 1:
The hybrid symbol is segmented into distinct portions: a CP portion containing CP samples, a data portion containing data symbols, and optionally a header portion or tail portion containing known samples. This segmentation allows each portion to be processed and configured independently, improving adaptability to different channel conditions while maintaining manageable complexity through modular design
Solution Approach 2:
The patent enables dynamic configuration of the hybrid symbol format by allowing the number of CP samples, data symbols, and known samples to be adjusted based on channel conditions and delay spread requirements. The format can be dynamically changed between different hybrid formats (first format with header, second format with tail, third format without header or tail), providing adaptability while using predefined templates to control complexity
2Object-affected harmful factors
If the CP portion includes samples corresponding to predefined samples at the end of the hybrid symbol, then inter-symbol interference is reduced, but the loss of time increases due to the overhead of repeating samples
Solution Approach 1:
The patent extracts the essential protective function of the CP by using a reduced number of CP samples that correspond to predefined samples at the end of the hybrid symbol. Instead of copying the entire symbol, only the necessary portion is repeated, maintaining ISI protection while reducing time overhead
Solution Approach 2:
The number of CP samples is optimized by changing the parameter from full symbol repetition to a reduced set of samples. The CP portion contains one or more CP samples corresponding to a predefined number of samples at the end of the hybrid symbol, adjusting the parameter to balance protection against ISI with time efficiency
3Reliability
If header portions or tail portions with predefined samples are added to the hybrid symbol, then waveform generation and transmission are enhanced, but the quantity of substance increases due to additional overhead samples
Solution Approach 1:
Known samples are placed in the header portion (at the beginning after CP) or tail portion (at the end before GI) to perform preliminary actions such as synchronization, channel estimation, and waveform conditioning. This preliminary processing enhances transmission reliability by preparing the signal in advance, while the optional nature of these portions allows flexibility in overhead management
Data Source
AI summary
A wireless device (e.g., a UE or a base station) may generate a hybrid symbol including a CP portion, a data portion, and at least one of a header portion or a tail portion. The CP portion may be located at a beginning of the hybrid symbol, and may include one or more CP samples that correspond to a predefined number of samples at an end of the hybrid symbol. The data portion may be located after the header portion or before the tail portion. The header portion may be located after the CP portion, and may include one or more predefined header samples. The tail portion may be located at the end of the hybrid symbol, and may include one or more predefined tail samples. The wireless device may generate a waveform including the generated hybrid symbol. The wireless device may transmit a signal based on the generated waveform.