Block Repeat Resource Blocks for Interference Reduction
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Solution Overview
Problem
In OFDM-based communication systems, users in neighboring cells experience interference when transmitting signals at the same time-frequency locations, degrading communication quality for users at the edge of a cell.
Innovation Solution
The method involves weighting and repeatedly spreading data symbols using a Repeat Factor and selecting a weight factor sequence to modulate and map them into Block Repeat resource Blocks, along with orthogonal pilot symbols, to reduce interference and improve signal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signals are transmitted at the same time-frequency locations in a same frequency network, then resource utilization is improved, but interference between users of neighbor cells increases
Solution Approach 1:
The patent segments the data symbols into multiple groups and assigns different weight factor sequences to different groups. This segmentation allows multiple users to share the same time-frequency resources while maintaining orthogonality through different weight sequences, thereby resolving the interference problem while preserving resource utilization.
Solution Approach 2:
The patent changes the parameter of weight factor sequences assigned to different users. By varying the weight factors in the sequence, the system enables multiple users to transmit simultaneously on the same time-frequency resources without causing mutual interference, thus improving resource utilization while controlling interference.
2Object-affected harmful factors
If weight factor sequences are used for spreading data symbols, then interference between users is reduced, but device complexity increases
Solution Approach 1:
The patent employs periodic weight factor sequences that repeat over time. This periodic structure simplifies the implementation at both transmitter and receiver, as the same weight sequences can be reused periodically, reducing the computational complexity compared to using entirely unique sequences for each user.
Solution Approach 2:
The patent uses copied and reused weight factor sequences across different users and time periods. Instead of generating completely new sequences for each user, the system copies and assigns different instances of predefined weight sequences, which simplifies the overall system complexity while maintaining the interference reduction benefit.
Data Source
Figure 1~2
Figure 3-1a~3-1b
Figure 3-1c~3-2a
AI summary
A signal transmission method, which includes: each data symbol needing to be transmitted is weighted and repeatedly extended to obtain the extended data symbol of each data symbol; the extended data symbol of each data symbol and the pilot frequency symbol are modulated and mapped to the specified time-frequency locations of each corresponding block repeat resource block to obtain each corresponding repeat data unit block; each repeat data unit block is transmitted. A signal transmission device is also disclosed in the present invention.