Cyclic Shift Encoding for Millimeter Wave Synchronization
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting system information and timing information, particularly in millimeter wave frequencies, where signal attenuation is high, leading to impractical implementations due to the need for multiple transmissions and unsupported combining of signals at the receiver.
Innovation Solution
A method where a base station transmits system information with an indication of transmission time by cyclically shifting and encoding transport blocks, allowing receivers to identify relative time differences and bit lengths, enabling efficient combination and decoding of multiple transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station encodes and transmits system information and timing information separately, then the receiver can process each transmission independently, but this solution is an inefficient use of system and over-the-air resources
Solution Approach 1:
The patent merges system information and timing information into a single transport block for joint encoding and transmission. The transport block includes both the system information bits and the timing indication bits, which are then encoded together using a cyclic code. This merging eliminates the need for separate transmissions, improving resource efficiency while maintaining the ability to convey both types of information simultaneously to the receiver.
2Productivity
If the base station encodes and transmits system information and timing information together, then resource usage is improved, but this solution creates an impractical implementation at the receiver because the receiver may not support combining multiple transmissions
Solution Approach 1:
The patent segments the transport block into distinct components: system information bits and timing indication bits. The timing indication is derived from the cyclic shift amount applied to the coded bits, which creates a detectable pattern that allows the receiver to identify timing information without requiring complex combining operations. This segmentation enables the receiver to process the joint transmission using simpler, more practical methods.
Solution Approach 2:
The patent uses cyclic shifting of the coded bits as a parameter change mechanism to embed timing information. By varying the cyclic shift amount based on the timing indication, the system encodes timing data in a way that maintains the overall structure of the transport block while creating detectable variations that the receiver can identify without complex combining operations.
3Reliability
If multiple transmissions are used to ensure reliable delivery in millimeter wave frequencies, then reliability is improved, but the need for multiple transmissions increases latency and power consumption
Solution Approach 1:
The patent applies preliminary error correction encoding using a cyclic code to the transport block before transmission. This preliminary action ensures that the transmitted signal has built-in error correction capability, allowing the receiver to reliably decode the information even in the presence of millimeter wave channel impairments. By preparing the signal with error correction codes in advance, the system achieves reliable delivery in a single transmission rather than requiring multiple retransmissions.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A base station may identify a transport block for transmission that includes an information component and an error detection code. The base station may transmit a first encoded message during a first transmission time. The first encoded message may be obtained by encoding the transport block cyclically shifted a first bit length. The base station may transmit a second encoded message during a second transmission time. The second encoded message may be obtained by encoding the transport block cyclically shifted a second bit length. The relative time distance between the first and second transmission times may convey an indication of the difference between the first bit length and the second bit length.