E-DPCCH Multiframe Detection With Correlation Combining
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Solution Overview
Problem
Conventional E-DPCCH processing in UMTS Release 6 requires high transmit power for satisfactory detection performance, which leads to faster power consumption and higher interference, especially as the number of retransmissions increases, limiting performance and efficiency.
Innovation Solution
The proposed solution involves generating decoding metrics based on a correlation set for the current frame and at least one previous frame of the control channel, combining correlations and noise energies across multiple frames to improve signal detection accuracy and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-frame E-DPCCH processing is used, then device complexity is low, but detection performance requires high transmit power leading to faster power consumption and higher interference
Solution Approach 1:
The patent combines multiple frames (current frame and previous frames) to generate decoding metrics through correlation sets. By merging information from multiple frames, the system achieves better detection performance without requiring high transmit power in each individual frame, thus reducing overall power consumption while improving reliability.
2Reliability
If conventional single-frame E-DPCCH processing is used, then processing speed is fast, but detection performance deteriorates with increased retransmissions due to higher interference
Solution Approach 1:
The patent converts the harmful effect of multiple retransmissions (which normally increase interference) into a benefit by using correlation sets that combine multiple frames. The correlation process extracts useful signal information while canceling out interference, transforming the problematic retransmission scenario into an opportunity for improved detection performance.
3Measurement precision
If multi-frame correlation sets are generated to improve detection accuracy, then detection performance improves, but device complexity increases
Solution Approach 1:
The patent segments the processing into distinct stages: generating correlation sets for individual frames, combining these correlation sets, and then generating decoding metrics. This segmentation allows the complex multi-frame processing to be broken down into manageable steps, making the implementation more feasible while maintaining high detection accuracy.
4Reliability
If transmit power is increased to maintain detection performance with retransmissions, then detection performance is maintained, but power consumption increases and interference increases
Solution Approach 1:
The patent performs preliminary processing by generating correlation sets from previous frames before combining them with the current frame. This preliminary action allows the system to prepare useful signal information in advance, enabling better detection performance without requiring increased transmit power, thus avoiding the generation of additional interference.
Data Source
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AI summary
A plurality of decoding metrics for a current frame may be generated based on a correlation set for a current frame and a correlation set for at least one previous frame. Whether a signal is present on a control channel may then be determined based on the generated decoding metrics.