Antenna Verification Unit Weight Vector Selection
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Solution Overview
Problem
Conventional antenna verification methods in closed-loop transmit diversity schemes, such as those in W-CDMA systems, face issues where erroneous judgments during verification lead to incorrect channel estimation, affecting subsequent slots and impacting overall communication quality.
Innovation Solution
A wireless receiving apparatus and method that verifies weight vectors or phase offsets by comparing reception signals with multiple candidate values, including previously verified values, to select the correct weight vector or phase offset, thereby correcting errors and ensuring accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna verification methods are used, then verification process is simple, but erroneous judgments lead to incorrect channel estimation affecting subsequent slots
Solution Approach 1:
The patent applies preliminary action by generating multiple candidate weight vectors before verification, including alternative candidates that account for potential bit errors in feedback information. This allows the system to prepare multiple hypotheses in advance, so when verification occurs, the correct weight vector can be identified even if past verification was erroneous, without adding complex real-time processing during subsequent slots.
Solution Approach 2:
The patent implements feedback by using the results of antenna verification to adjust and refine weight vector selection in subsequent slots. The system feeds back the verified weight vector information to correct channel estimation in affected slots, creating a closed-loop verification process that continuously improves reliability based on verification outcomes.
2Measurement precision
If multiple candidate weight vectors are verified, then channel estimation accuracy improves, but verification time increases
Solution Approach 1:
The patent segments the verification process by dividing candidate weight vectors into multiple groups or candidates, where each candidate corresponds to a specific bit error scenario. This segmentation allows the system to efficiently evaluate multiple possibilities without overwhelming computational burden, as each segment can be processed independently and the correct segment identified through comparison.
Solution Approach 2:
The patent applies partial action by generating a limited set of candidate weight vectors that covers the most probable error scenarios, rather than exhaustively checking all possible weight vectors. This approach achieves sufficient verification precision for practical purposes while significantly reducing the time and computational resources required compared to complete verification.
3Reliability
If past verification errors are corrected, then communication quality improves, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of multiple candidate weight vectors that mediate between the received feedback information and the final weight vector selection. This intermediary layer allows the system to handle verification errors without requiring complex error correction algorithms, as the correct weight vector can be identified by comparing candidates against the received signal characteristics.
Data Source
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AI summary
A wireless receiving apparatus according to an embodiment of the invention can communicate with a wireless transmitting apparatus that implements a closed-loop transmit diversity scheme using a first antenna and a second antenna. An antenna verification unit of the wireless receiving apparatus verifies a weight vector added to at least one of a signal sent from the first antenna and a signal from the second antenna by the wireless transmitting apparatus based on feedback information from the wireless receiving apparatus. Further, the antenna verification unit compares a reception signal with a plurality of weight vector candidate values that are determined based on a previously verified weight vector to select a weight vector set by the wireless transmitting apparatus from the plurality of candidate values, and if a weight vector added to a signal received from the wireless transmitting apparatus does not match a weight vector that is determined based on the feedback information in the past verification of the weight vector, verification is carried out by adding to the plurality of candidate values, a weight vector candidate value obtained when the weight vector determined in the past verification is assumed as the weight vector that is determined based on the feedback information.