Multicarrier Signal Interference Reduction via Contour Ring Computation
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Solution Overview
Problem
Existing techniques for transmitting multicarrier signals, particularly in OFDM/OQAM modulation, face challenges in reducing inter-symbol interference without using a guard interval, which limits spectral efficiency and is not suitable for multi-antenna systems with increased pilots, leading to inefficiencies in channel estimation.
Innovation Solution
A method that computes and reduces interference affecting data elements by assigning values to adjacent carriers in a compact contour ring, allowing accurate channel estimation without requiring a guard interval or disjoined rings, thus optimizing time-frequency resource use in multi-antenna systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a guard interval is introduced to reduce inter-symbol interference, then interference reduction is achieved, but spectral efficiency deteriorates due to reduced payload information transmission
Solution Approach 1:
The patent extracts and eliminates the harmful interference components from the pilot carriers by computing and canceling the intrinsic interference caused by adjacent carriers. This allows removing the guard interval while maintaining pilot estimation accuracy, thereby resolving the contradiction between interference reduction and spectral efficiency.
Solution Approach 2:
The patent converts the harmful intrinsic interference from adjacent carriers into a computable and cancelable component. By calculating the interference from the contour ring carriers and subtracting it from the pilot reception, the harmful effect is transformed into a manageable parameter that can be eliminated, achieving both interference reduction and high spectral efficiency.
2Object-affected harmful factors
If disjoined rings are used around pilots to reduce interference, then interference reduction is achieved, but device complexity and resource optimization deteriorate
Solution Approach 1:
The patent segments the interference reduction process into a systematic method: identifying contour ring carriers adjacent to each pilot, computing their specific interference contribution, and canceling it separately. This segmented approach simplifies the overall complexity compared to disjoined rings while maintaining effectiveness.
Solution Approach 2:
The patent applies local quality by computing and canceling interference specifically for each pilot's immediate contour ring rather than using a uniform disjoined ring structure. This localized approach reduces complexity by focusing only on the necessary adjacent carriers while maintaining interference reduction effectiveness.
3Measurement precision
If the number of pilots is increased in multi-antenna systems, then channel estimation accuracy is improved, but interference management becomes more difficult
Solution Approach 1:
The patent applies preliminary action by computing and canceling the intrinsic interference from contour ring carriers before the actual channel estimation process. This preliminary interference removal allows increasing the number of pilots for better estimation accuracy without proportionally increasing interference management complexity, as the interference cancellation mechanism handles multiple pilots systematically.
Data Source
AI summary
A method is provided for transmitting a multi-carrier signal formed of a temporal succession of symbols comprised of a set of data elements. The method includes: calculating an interference affecting a set of at least two data elements which are to be protected and are spaced out two by two from no more than one time carrier and no more than one frequency carrier, the interference taking into account the value of the data elements to be protected and values of the data elements of a contour ring consisting of carriers immediately adjacent to data elements to be protected, and; determining at least one value to be attributed to at least one data element of the contour ring for reducing, upon reception, the calculated interference.