PBCH Antenna Configuration Detection Using Masked CRC
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Solution Overview
Problem
Modern communication systems face significant bandwidth overhead in conveying antenna configuration information, which affects the efficiency and reliability of wireless communication.
Innovation Solution
Encoding antenna configuration information into QPSK constellations and error correction data, allowing base stations to transmit this information without separate transmission, thereby reducing overhead and ensuring reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna configuration information is transmitted separately, then communication reliability is improved, but bandwidth overhead increases
Solution Approach 1:
The patent combines antenna configuration information with data transmission by encoding the configuration into QPSK constellation mappings. Instead of separate transmission, the configuration bits are integrated into the modulation scheme itself, where different constellation mappings represent different antenna configurations. This merging eliminates dedicated overhead for configuration transmission while maintaining reliable communication through the combined data-bearing signal.
Solution Approach 2:
The QPSK constellation mapping serves multiple functions simultaneously: it conveys both user data and antenna configuration information. The same modulation symbols that carry payload data also encode the antenna configuration through their mapping pattern. This multi-functionality allows the system to transmit configuration information without requiring additional dedicated resources, effectively reducing bandwidth overhead while preserving reliability.
2Measurement precision
If antenna configuration is conveyed through separate transmission, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The patent merges antenna configuration detection with regular data demodulation processes. The receiver uses the same QPSK demodulation and constellation mapping analysis that is already performed for data recovery to simultaneously extract antenna configuration information. By combining these detection functions, the system avoids adding separate complex detection mechanisms while maintaining accurate configuration detection through the integrated mapping relationships.
3Quantity of substance
If blind detection methods are used for antenna configuration, then bandwidth overhead is reduced, but detection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining specific QPSK constellation mappings that correspond to different antenna configurations. Instead of relying on blind detection where the receiver guesses the configuration, the system预先 establishes known mapping patterns that encode configuration information. The receiver can then reliably detect the configuration by identifying which predefined mapping is being used, transforming blind detection into a structured recognition process that maintains both low overhead and high reliability.
Solution Approach 2:
The system implements feedback through the structured QPSK mapping relationships, where the transmitted constellation pattern itself carries information about the antenna configuration. The receiver uses this feedback embedded in the modulation scheme to accurately determine the configuration without requiring separate signaling. This feedback mechanism within the data transmission ensures reliable detection while avoiding the bandwidth overhead of separate configuration channels.
Data Source
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AI summary
A method by a terminal in a wireless communication system, wherein the method comprises the following steps: receiving, on a physical broadcast channel, PBCH, signals including a data and masked cyclic redundancy check, CRC, from a base station; demodulating the signals based on a transmission scheme corresponding to a single transmitter by assuming that a number of transmit antennas is 1; descrambling and decoding the demodulated signals at four different transmission timings; performing a CRC check for the masked CRC using a first masking sequence corresponding to the number of transmit antennas being 1 among a plurality of masking sequences, wherein each of the plurality of masking sequence is corresponding to a number of transmit antennas ; and determining that the number of transmit antennas configured in the base station is 1, if the CRC check using the first masking sequence is passed.