Multi-cell Joint Detection for Slotted CDMA Interference
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Solution Overview
Problem
Intra-frequency neighboring cell interference significantly degrades the performance of slot CDMA systems, as existing single cell joint detection methods are ineffective in managing inter-symbol and multi-user interference between cells with the same frequency network.
Innovation Solution
A multi-cell joint detection method that utilizes structure information from multiple intra-frequency neighboring cells, involving channel estimation and code channel grouping to perform joint detection, effectively reducing interference and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If single cell joint detection method is used, then local cell interference is reduced, but intra-frequency neighboring cell interference cannot be restrained
Solution Approach 1:
The patent merges the detection processes of multiple cells by constructing a unified multi-cell transmission matrix that incorporates channel response information from all neighboring cells. This combined approach allows simultaneous detection across cells, enabling the system to restrain intra-frequency neighboring cell interference while maintaining local cell interference suppression capabilities.
Solution Approach 2:
The patent extends the detection dimension from single-cell to multi-cell by incorporating channel response information from multiple cells into the transmission matrix. This dimensional expansion allows the system to capture and process interference patterns across cell boundaries, transforming the detection capability from local to regional scope.
2Object-affected harmful factors
If multi-cell joint detection is implemented, then intra-frequency neighboring cell interference is reduced, but system complexity increases
Solution Approach 1:
The patent segments the multi-cell detection process into distinct stages: channel estimation for each cell, construction of the multi-cell transmission matrix, and joint detection execution. This segmentation allows complex operations to be organized systematically, making the process more manageable and implementable despite the increased complexity.
Solution Approach 2:
The patent performs preliminary channel estimation for all neighboring cells before constructing the transmission matrix and executing joint detection. This preliminary action prepares necessary information in advance, reducing the computational burden during the actual detection phase and streamlining the overall process.
3Measurement precision
If channel response information of all users is used, then detection accuracy is improved, but computational load increases
Solution Approach 1:
The constructed multi-cell transmission matrix serves multiple functions simultaneously: it models signal transmission, captures interference patterns, and enables joint detection across multiple cells. This multi-functionality reduces the need for separate processing steps, thereby lowering overall computational load while maintaining high detection accuracy.
Data Source
AI summary
The present invention is directed to a multicell joint detection method, it deals against the interference between same frequency neighboring cell's signals in slotted CDMA system, and provides a joint detection method based on the multicell structure information. The method includes the steps of: using channel estimation of multi-set of codes to obtain channel estimation results of each neighboring cell; grouping each neighboring cell's code channel, including grouping based on the code channel's cell, grouping based on the code channnel's power or amplitude intensity, grouping based on the code channel's pertinence, and mixed grouping based on the above methods; making use of the channel estimation result and the result of code channel grouping to process the joint detection and output the detection data. This method makes full use of the structure information of each multicells signal, and efficiently restrains the multiple-access interference of the same frequency neighboring cell. This method can be used in slotted CDMA system or wireless communicataion system with similar signal structure.