Dual Transport Block Superposition With Gray Mapping Properties
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Solution Overview
Problem
In wireless communications, directly superposed Transport Blocks (TBs) do not possess Gray mapping properties, leading to suboptimal spectral efficiency and interference cancellation performance.
Innovation Solution
Divide data into two portions, modulate each portion into amplitude weighted complex symbol sequences, and superpose them to generate a new TB with Gray properties, allowing for improved spectral efficiency and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two TBs are directly superposed to improve spectral efficiency, then transmitting power utilization is improved, but the constellation points do not possess Gray mapping properties leading to demodulation errors
Solution Approach 1:
The patent changes the parameter of constellation point mapping by introducing Gray mapping properties to the superposed TBs. Specifically, it ensures that adjacent constellation points differ by only one bit, which resolves the demodulation errors caused by direct superposition while maintaining the spectral efficiency benefits of dual TB transmission.
Solution Approach 2:
The patent introduces an intermediary mapping mechanism that acts between the direct superposition of TBs and the final constellation points. This intermediary Gray mapping process ensures that the superposed symbols maintain optimal demodulation properties, effectively mediating between the interference of dual TBs and the requirement for accurate reception.
2Reliability
If SIC technology is used to separate two TBs, then interference cancellation performance is improved, but error propagation occurs during demodulation
Solution Approach 1:
The patent applies preliminary Gray mapping to the superposed TBs before transmission. This preliminary action ensures that the constellation points are pre-configured with Gray mapping properties, which reduces the impact of error propagation during SIC demodulation by minimizing the bit errors that can occur when constellation points are misidentified.
3Adaptability or versatility
If maximum MCS is used in the standard, then compatibility is maintained, but spectral efficiency cannot reach optimum level when channel quality is good
Solution Approach 1:
The patent segments the data into two separate TBs that are superposed and transmitted together. This segmentation allows the system to maintain compatibility with existing MCS standards for each individual TB while achieving higher overall spectral efficiency through the combined transmission of multiple TBs using SIC technology at the receiver.
Data Source
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AI summary
Provided are a data transmitting or receiving method and device for dual Transport Blocks (TBs), a transmitter and a receiver. Data to be transmitted is divided into two portions, where transport blocks TB1 and TB2 are generated respectively according to a corresponding predetermined Modulation Coding Scheme (MCS) for each portion. The TB1 is modulated into an amplitude weighted complex symbol sequence S1, and the TB2 is modulated into an amplitude weighted complex symbol sequence S2. The S1 and the S2 are superposed to generate a complex symbol sequence S3 corresponding to a new TB, where the complex symbol sequence S3 corresponding to the new TB possesses Gray properties. The new TB is transmitted to a receiver. The technical solution improves the spectral efficiency, endows superposed symbol constellation points with Gray properties, improves the Successive Interference Cancellation (SIC) demodulation performance, and achieves an effect that different powers may be allocated to different data streams.