Channel Impulse Response Estimation for Multi-Cell Joint Detection
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Solution Overview
Problem
Current TD-SCDMA systems can only perform multi-mobile terminal joint detection on uplink signals within the same cell, treating signals from neighboring cells as unknown Multi-Access Interference (MAI), which limits system capacity and quality due to increased interference from mobile terminals in neighboring cells.
Innovation Solution
A method to determine channel impulse response estimation windows for mobile terminals in neighboring cells by presetting peak locations with a predetermined change pattern, allowing the base station to identify and extract channel impulse responses for joint detection across cells, thereby reducing MAI and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multi-mobile terminal joint detection is performed only within the same cell, then device complexity is reduced and ease of operation is improved, but system capacity and anti-interference ability deteriorate due to increased MAI from neighboring cells
Solution Approach 1:
The patent merges the detection scope from single-cell to multi-cell by incorporating mobile terminals from neighboring cells into the joint detection process. The base station performs joint detection on uplink signals from both current cell and neighboring cells, treating them as a unified detection group, which reduces MAI and improves anti-interference ability while maintaining operational simplicity through automated window determination
Solution Approach 2:
The patent applies preliminary action by pre-determining channel impulse response estimation windows for mobile terminals in neighboring cells before actual signal detection. The base station uses preset peak location change patterns to establish estimation windows in advance, enabling efficient joint detection without increasing real-time processing complexity
2Productivity
If channel impulse response estimation windows are determined for mobile terminals in neighboring cells, then system capacity and anti-interference ability are improved, but device complexity and measurement precision requirements increase
Solution Approach 1:
The patent changes key parameters by introducing preset peak location change patterns for channel impulse responses of mobile terminals in neighboring cells. By establishing predetermined relationships between peak locations in different periods, the system can determine estimation windows through parameter correlation rather than complex real-time analysis, increasing system capacity while controlling complexity
Solution Approach 2:
The patent uses copying by applying the same peak location change pattern observed in current cell terminals to neighboring cell terminals. The base station copies the deterministic relationship between channel impulse response peaks across different periods from known terminals to unknown neighboring terminals, enabling window determination without direct measurement, thus improving capacity while minimizing complexity increase
3Object-generated harmful factors
If signals from neighboring cells are treated as known channel impulse responses, then multi-access interference is reduced and system quality is improved, but measurement precision and detection difficulty increase
Solution Approach 1:
The patent implements feedback by using the predetermined peak location change pattern as a reference to verify and refine the determination of channel impulse response estimation windows. The base station compares actual received signal characteristics against the expected peak location patterns, providing feedback validation that reduces detection difficulty while enabling accurate identification of neighboring cell terminal signals for MAI reduction
Data Source
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Figure 3A~3B
AI summary
A method and system is disclosed for determining channel impulse response estimation window in a current cell for at least one mobile terminal from a neighboring cell. After presetting, from the neighboring cell, at least two channel impulse response peak locations of each mobile terminal in a first and a second predetermined periods with a predetermined peak location change pattern, upon receiving communication from the mobile terminal, channel impulse responses are analyzed to identify the peak location change pattern with regard to a first and a second peak locations. A channel impulse response estimation window is then determined for the mobile terminal based on the analyzed channel impulse responses and a preferred estimation window size.