Complementary Reference Signal Sequences for Low PAPR
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Solution Overview
Problem
Current reference signal technologies suffer from reduced flatness in the frequency domain due to non-constant modulus properties, affecting performance, particularly in reducing peak to average power ratio (PAPR) and channel estimation accuracy.
Innovation Solution
Generating two reference signals based on complementary sequences that are sent using the same antenna port and resource, ensuring flatness in the frequency domain and improving performance by maintaining constant modulus properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a reference signal sequence is generated in time domain for modulation to reduce PAPR, then the peak to average power ratio is reduced, but the flatness of the reference signal in frequency domain decreases
Solution Approach 1:
The reference signal is segmented into two separate sequences (first reference signal sequence and second reference signal sequence) that are transmitted on the same time-frequency resource. Each sequence individually maintains constant modulus property, while their combination achieves both low PAPR and flat frequency domain characteristics through complementary sequence design
Solution Approach 2:
The patent combines two reference signal sequences with complementary sequence properties to create a composite reference signal structure. The complementary sequences are designed such that their auto-correlation properties complement each other, achieving flat frequency domain response while maintaining constant modulus in time domain for low PAPR
2Ease of manufacture
If a reference signal sequence is generated in time domain for modulation, then the generation process is simplified, but the performance of the reference signal is affected due to non-constant modulus property in frequency domain
Solution Approach 1:
The reference signal is divided into two separately generated sequences that are transmitted together. Each sequence can be independently generated using simple time-domain modulation methods, maintaining ease of implementation while the combined structure ensures reliable channel estimation performance through complementary sequence properties
Solution Approach 2:
The patent changes the key parameter of constant modulus from being a property of a single sequence to a property of two sequences taken together. By designing complementary sequences where individual sequences have constant modulus and their combination achieves flat frequency response, the system maintains simple generation processes while ensuring reliable performance
Data Source
AI summary
Example reference signal sending and receiving methods and apparatus are described. One example method includes generating a first reference signal based on a first sequence and generating a second reference signal based on a second sequence by a first device, where the first sequence and the second sequence are complementary sequences. The first device sends the first reference signal and the second reference signal by using a same antenna port and a same resource.