MIMO Symbol Stream Decoding Order for Reliable Interference Cancellation
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Solution Overview
Problem
Successive interference cancellation techniques in MIMO systems suffer from error propagation due to the sequential detection of symbol streams, where errors in previous decoded layers often lead to errors in subsequent layers, reducing the efficacy of the method.
Innovation Solution
Incorporating the number of retransmissions and reliability of decoding into the interference cancellation process, where symbol streams with higher retransmissions or better channel energy and signal-to-interference ratios are prioritized for decoding, and using previous decoding orders to select streams for interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If successive interference cancellation is performed by detecting symbol streams sequentially, then interference among symbol streams is reduced, but error propagation occurs where errors in previous decoded layers lead to errors in subsequent layers
Solution Approach 1:
The patent performs preliminary actions by determining the number of retransmissions for each symbol stream before decoding, and uses this information to establish an optimal decoding order. This preliminary assessment allows the system to prioritize decoding of more reliable streams first, preventing error propagation to subsequent streams while still achieving interference cancellation through sequential processing
2Productivity
If symbol streams are decoded in parallel, then processing efficiency is improved, but interference cancellation efficacy is reduced due to error propagation
Solution Approach 1:
The patent introduces dynamic adaptability by adjusting the decoding order based on the number of retransmissions associated with each symbol stream. Rather than using a fixed sequential or parallel approach, the system dynamically determines the optimal processing order, decoding streams with more retransmissions (indicating higher reliability) first, thereby balancing processing efficiency with error propagation mitigation
Data Source
AI summary
A method for processing a plurality of symbol streams is provided. The method includes receiving a first symbol stream, wherein the first symbol stream has a corresponding first number of retransmissions. The method further includes receiving a second symbol stream, wherein the second symbol stream has a corresponding second number of retransmissions. The method further includes selecting the first symbol stream for decoding, if the first number of retransmissions is greater than the second number of retransmissions.