Alamouti Decoder Feedforward Phase Compensation for Signal Interference
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Solution Overview
Problem
Existing Alamouti decoders suffer from performance degradation due to mutual interference between signals arriving at a receiving end through different paths when transmitted by two transmitting ends, exacerbated by feedback loops in carrier phase compensation.
Innovation Solution
Implement a feedforward phase compensation structure by separating the phase compensation portion from the feedback loop and performing phase recovery operations independently in a separate device, using methods like blind phase search for precise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback loop is used for carrier phase compensation in an Alamouti decoder, then phase compensation is performed, but performance degradation occurs due to time differences between estimation and compensation
Solution Approach 1:
The patent performs phase estimation and compensation in advance before the Alamouti decoding process. By estimating the phase using pilot signals and compensating beforehand, the system eliminates the time delay inherent in feedback loops. The pre-compensated signals are then processed through the Alamouti decoder without additional phase estimation delays, thus resolving the contradiction between maintaining compensation accuracy and minimizing time loss.
2Object-affected harmful factors
If phase compensation is performed within the feedback loop of the Alamouti decoder, then interference between signals from two transmitting ends is addressed, but system complexity increases
Solution Approach 1:
The patent extracts the phase compensation function from the Alamouti decoder's feedback loop and implements it as a separate preliminary processing stage. By taking out the phase compensation operation and performing it independently before signal decoding, the system reduces the complexity of the decoder structure while still effectively addressing signal interference from multiple transmitting ends.
Data Source
AI summary
According to an aspect of the present disclosure, there is provided an alamouti decoding method having a feedforward phase compensation structure, the Alamouti decoding method comprising: detecting a phase of each of a plurality of symbols received through a plurality of antennas; performing first phase compensation on the detected phase using a pilot tone included in the plurality of symbols; converting the first phase compensated serial symbol sequence into a parallel symbol sequence; decoding the parallel symbol sequence by a decoder; and performing second phase compensation on the decoded symbol sequence.