Sidelink DMRS Gold Sequence Initialization for Frequency Offset
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Solution Overview
Problem
The performance of carrier frequency offset in LTE V2X communication is poor, affecting synchronization between terminals.
Innovation Solution
A method for generating a demodulation reference signal (DMRS) sequence based on slot number, sidelink synchronization signal identifier, or sidelink synchronization signal block index, using formulas to initialize the DMRS sequence, which includes utilizing a GOLD sequence for interference randomization and reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Zad-off Chu sequence is used as the demodulation reference signal in LTE V2X, then the sequence structure is simple and easy to implement, but the performance of overcoming carrier frequency offset is poor
Solution Approach 1:
The patent changes the initialization parameters of the Gold sequence by introducing slot number, sidelink synchronization signal identifier, and sidelink synchronization signal block index as initialization inputs. This parameter transformation converts the simple Zad-off Chu sequence into a Gold sequence with improved autocorrelation properties that can better overcome carrier frequency offset while maintaining implementation simplicity
2Reliability
If additional reference signal sequences are introduced to improve demodulation performance, then the carrier frequency offset performance is improved, but the signaling overhead increases
Solution Approach 1:
The Gold sequence is designed to serve multiple functions simultaneously: it acts as both the demodulation reference signal and carries synchronization information through its initialization parameters. The sequence structure is configured to provide both channel estimation capability and carrier frequency offset correction, eliminating the need for separate reference signals and reducing overall signaling overhead
Solution Approach 2:
The patent combines the demodulation reference signal function with the synchronization signal function by using the same Gold sequence structure initialized with synchronization-related parameters. This merging of functions allows the reference signal to carry both channel information and synchronization information, reducing the total amount of signaling required
3Reliability
If complex initialization formulas are used to generate the DMRS sequence, then the carrier frequency offset performance is improved, but the computational complexity increases
Solution Approach 1:
The initialization parameters including slot number, sidelink synchronization signal identifier, and sidelink synchronization signal block index are prepared and determined in advance before the actual Gold sequence generation. This preliminary preparation of initialization values simplifies the runtime computation by pre-calculating the seed values that will be used during sequence generation, reducing the computational burden during actual demodulation operations
Data Source
AI summary
This disclosure provides a method for transmitting a demodulation reference signal of a sidelink, a method for receiving the demodulation reference signal of the sidelink, and a terminal. The method for transmitting the demodulation reference signal of the sidelink, applied to a transmitting side terminal, includes: initializing a first demodulation reference signal (DMRS) sequence based on at least one of a slot number, a sidelink synchronization signal identifier or a sidelink synchronization signal block index to generate the first DMRS sequence; transmitting the first DMRS sequence.