Diversity Receiver Branch Control for Power and Signal Trade-offs
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Solution Overview
Problem
Diversity receiving apparatuses face challenges in maintaining reception accuracy and reducing power consumption, particularly when branches experience deteriorated receiving status, leading to decreased performance and increased power usage.
Innovation Solution
A diversity receiving apparatus with multiple branches, including a timing adjusting unit and a control unit that synchronizes processing timing and controls the stopping and starting of branches based on receiving status, along with judging units to assess branch performance, allowing for the selection and combination of data carriers and reducing power consumption by stopping unnecessary branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diversity receiving is performed for every carrier using multiple branches, then receiving quality is improved, but power consumption increases and receiving accuracy deteriorates when branches are in bad receiving status
Solution Approach 1:
The patent dynamically controls the operation state of each branch based on real-time receiving status assessment. The control unit monitors pilot carrier amplitudes and selectively activates or deactivates branches, transitioning the system from a static all-branches-operating mode to a dynamic adaptive mode that optimizes power consumption while maintaining receiving quality.
Solution Approach 2:
The patent changes the operational parameters of branches based on receiving status. By monitoring pilot carrier amplitude and comparing it against thresholds, the system adjusts which branches are active, effectively changing the system configuration parameter (number of active branches) to optimize the trade-off between power consumption and receiving quality.
2Reliability
If branches in bad receiving status are used for diversity receiving, then receiving quality deteriorates, but stopping branch operation increases complexity of control
Solution Approach 1:
The patent performs preliminary assessment of branch receiving status using pilot carriers before combining data carriers. By evaluating pilot carrier amplitude in advance and determining which branches are in good receiving status, the system prepares a selection map that guides the combining operation, preventing deterioration of receiving accuracy while managing control complexity through structured preliminary evaluation.
Solution Approach 2:
The patent implements feedback control by continuously monitoring pilot carrier amplitudes from each branch and using this information to dynamically adjust which branches are activated for diversity receiving. The control unit receives feedback on branch status and adjusts the selection accordingly, creating a closed-loop system that maintains receiving accuracy while adapting to changing conditions.
3Use of energy by moving object
If decoding operation of a branch is stopped and then resumed, then power consumption is reduced, but data stored when stopping causes malfunction and extra time is required to obtain receiving accuracy
Solution Approach 1:
The patent extracts and removes the problematic stored data from the branch when a branch is deactivated. By clearing the buffer or memory contents of a branch before stopping its decoding operation, the system prevents data corruption or malfunction upon resumption, enabling faster reactivation without the penalty of extra time to recover from stale data issues.
Data Source
AI summary
There is provided a diversity receiving apparatus, comprising: a first branch (5) for decoding a frequency multiplexing signal in which a carrier group has been multiplexed, thereby outputting a first data carrier and a first pilot carrier; a second branch (6) for decoding a frequency multiplexing signal in which a carrier group has been multiplexed, thereby outputting a second data carrier and a second pilot carrier; a timing adjusting unit (7) for synchronizing processing timing for a carrier group decoded by the first branch (5) and a carrier group decoded by the second branch (6); a combining/selecting unit (8) for combining/selecting the first data carrier and/or the second data carrier; and a control unit (10) for controlling stopping and starting operation of at least one of the first branch (5) and the second branch (6) according to at least one of a receiving status of the first branch (5) and a receiving status of second branch (6).