Single Code Rate With Multiple Modulation Schemes
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Solution Overview
Problem
Existing communication systems face challenges in efficiently transmitting multiple data streams due to varying channel conditions and signal-to-noise-and-interference ratios, which complicates rate selection and affects performance.
Innovation Solution
The use of a single code rate with multiple modulation schemes for multiple data streams, where channel estimates determine the selection of a single code rate and modulation schemes for each stream, simplifying encoding and decoding while improving performance by matching each stream's SNR to its required level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different code rates and modulation schemes are selected for each data stream to match varying channel conditions, then transmission performance is improved, but rate selection complexity and device configuration complexity increase
Solution Approach 1:
The patent applies local quality by selecting different modulation schemes for different data streams based on their specific channel conditions (SNR levels), while using a unified code rate for all streams. This allows each stream to be optimized locally for its channel quality without requiring complex per-stream rate selection, thus improving transmission performance while controlling complexity.
2Reliability
If independent rate selection is performed for each data stream based on varying SNRs, then transmission reliability is improved, but the amount of rate information to be transmitted increases
Solution Approach 1:
The patent merges the rate selection by using a single code rate for all data streams while allowing different modulation schemes. This combining approach reduces the amount of rate information that needs to be selected and transmitted, as the code rate parameter is unified across all streams, thereby reducing information overhead while maintaining reliability through stream-specific modulation adaptation.
3Adaptability or versatility
If multiple code rates and modulation schemes are used for multiple data streams, then adaptability to varying channel conditions is improved, but encoding and decoding complexity increase
Solution Approach 1:
The patent applies local quality by allowing different modulation schemes for different data streams to adapt to their specific channel conditions, while using a unified code rate for all streams. This provides adaptability to varying SNR conditions through modulation diversity while reducing encoding and decoding complexity by eliminating the need to handle multiple code rates simultaneously.
4Reliability
If rate selection is performed for each data stream based on varying SNRs, then transmission performance is improved, but the time required for rate selection increases
Solution Approach 1:
The patent merges the rate selection process by establishing a single code rate that applies to all data streams, while allowing modulation schemes to vary by stream. This unified approach significantly reduces the time required for rate selection compared to independent per-stream rate selection, as the code rate parameter needs to be determined only once rather than separately for each stream, while still maintaining performance through modulation adaptation.
Data Source
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AI summary
Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may support a set of code rates, and each code rate may be associated with a respective set of modulation schemes that may be used with that code rate. The single code rate for all data streams is selected from among the set of supported code rates, and the modulation scheme for each data stream is selected from among the set of modulation schemes associated with the single code rate. The multiple data streams are encoded in accordance with the single code rate. Each data stream is further modulated in accordance with the modulation scheme selected for that stream.