Reference Signal Sequence Mapping for Single-Carrier Waveform Overhead Reduction
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Solution Overview
Problem
Existing single-carrier waveform communication systems face challenges in designing efficient reference signal sequence mapping and de-mapping methods, leading to high time-domain overheads and reduced performance.
Innovation Solution
The proposed method involves determining multiplexing sets by mapping reference signal sequences to modulation symbol sets, allowing the multiplexing sets to occupy a single-carrier time domain symbol, thereby reducing time-domain overheads. This method also incorporates Space-Time Block Code (STBC) encoding to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reference signal sequence occupies one single-carrier time domain symbol, then the reference signal can be transmitted independently, but the time-domain overheads of the reference signal increase
Solution Approach 1:
The patent merges the reference signal sequence with the modulation symbol set into a single multiplexing set. The reference signal sequence is mapped to specific positions within the modulation symbol set, creating a combined structure that occupies only one single-carrier time domain symbol. This eliminates the need for separate time domain symbols for reference signals, thereby reducing time-domain overheads while maintaining reliable reference signal transmission for channel estimation.
2Loss of time
If the reference signal sequence is mapped to the modulation symbol set, then the time-domain overheads are reduced, but the complexity of mapping and de-mapping increases
Solution Approach 1:
The patent segments the multiplexing set into distinct components: modulation symbols and reference signal sequences, arranged in specific patterns. The reference signal sequence is mapped to predetermined positions within the modulation symbol set, creating a structured segmentation that facilitates systematic de-mapping. This structured approach, combined with STBC encoding, provides clear rules for separating reference signals from data at the receiver, managing complexity through organized structure rather than arbitrary mapping.
Solution Approach 2:
The patent employs Space-Time Block Code (STBC) encoding on the multiplexing sets, transforming the mapping problem into a coded structure with known properties. STBC provides deterministic relationships between transmitted and received signals, enabling simplified de-mapping through known decoding operations. This parameter transformation approach converts complex mapping relationships into structured coded formats that are easier to process at the receiver.
3Object-affected harmful factors
If STBC encoding is applied to the multiplexing sets, then the resistance to high-frequency noise is improved, but the processing complexity increases
Solution Approach 1:
The patent applies STBC encoding to create redundant coded versions of the multiplexing sets that can be processed through simple linear operations at the receiver. The STBC structure uses basic mathematical operations (matrix multiplication and conjugation) that are computationally inexpensive compared to more complex error correction codes. The encoding adds redundancy that provides noise resistance through simple processing, effectively using low-complexity operations to achieve robust noise immunity.
Data Source
AI summary
Reference signal sequence mapping and de-mapping methods, and an apparatus are provided, to resolve a problem in a conventional technology that time-domain overheads of a reference signal of a single-carrier waveform are relatively large. In this application, a sending device maps a reference signal sequence to a modulation symbol set, to obtain a multiplexing set, where the multiplexing set occupies one single-carrier time domain symbol. Compared with a solution in which a reference signal sequence occupies one single-carrier time domain symbol, the solution in this application reduces time-domain overheads of the reference signal. In addition, to correctly perform channel estimation or channel sounding for the reference signal, different reference signal sequences meet conditions such as orthogonality or conjugate orthogonality, and locations of the reference signal sequences in different multiplexing sets further meet corresponding conditions, and so on.