BRDM Signal Generation for Inter-Cell Interference Reduction
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Solution Overview
Problem
Current broadband wireless communication systems face challenges in resource allocation and interference control, particularly in cellular networks where simultaneous frequency usage leads to significant inter-cell interference, complicating resource scheduling and increasing communication errors.
Innovation Solution
The implementation of Block Repeat (BR) transmission and Division Multiplex (BRDM)/Division Multiple Access (BRDMA) solutions, which involve repeating elementary physical resource blocks and applying weighting factors to reduce interference and simplify coordination between cells, allowing for flexible resource allocation and improved system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFT-S OFDM multiple access is used for uplink transmission, then PAPR is reduced and coverage is improved, but significant inter-cell interference occurs when cells use the same frequency
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and assigns different sub-bands to different cells for uplink transmission. This frequency division approach divides the interfering signal space, allowing cells to operate on the same frequency without causing mutual interference, thus resolving the contradiction between maintaining good uplink coverage and avoiding inter-cell interference.
2Productivity
If cells network at the same frequency to increase system capacity, then resource utilization improves, but interference control becomes complex and communication performance degrades
Solution Approach 1:
The patent divides the frequency spectrum into multiple sub-bands and assigns different sub-bands to different cells. This segmentation allows multiple cells to network at the same overall frequency range while maintaining simple resource coordination, as each cell operates on its designated sub-band without complex interference management requirements.
Solution Approach 2:
The patent transitions from single-carrier frequency assignment to multi-sub-band frequency division. By adding the frequency sub-band dimension, the system enables multiple cells to operate simultaneously at the same frequency with simple resource allocation, improving system capacity while keeping coordination complexity low.
3Object-affected harmful factors
If frequency division is applied to separate cells, then inter-cell interference is reduced, but resource allocation flexibility decreases
Solution Approach 1:
The patent implements dynamic sub-band assignment where cells can be flexibly allocated to different sub-bands based on traffic demand and channel conditions. This dynamic resource allocation maintains the interference isolation benefits of frequency division while providing the adaptability needed for varying service requirements and load conditions.
Data Source
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AI summary
Method for signal generation in broadband wireless communications, comprises: A. modulating, segmenting and serial-parallel converting the signal data to be transmitted, then computing DFT of the serial-parallel converted data so as to transfer them to frequency domain; B. performing block unit modulating processing and block repeat modulating processing on the frequency domain data, then mapping the block units to assigned time-frequency positions; C. computing IFFT of the mapped block units, then adding them to the cycle prefix, thus the random sequences in time domain are generated. Apparatus for signal generation, Method and system for message transmission in broadband wireless communications are also disclosed. The problem of resource allocation and scheduling, and problem of interference coordination and control are solved, the throughput and performance of communication system are greatly improved.