Receiver Gain Hold Timing to Prevent BER From Gain Switching
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Solution Overview
Problem
In wireless receiver apparatuses, the gain switching of the gain control amplifier leads to bit error rate deterioration due to varying field strength ripples between header and real data parts, especially in systems where modulation changes, such as π/4QPSK for headers and 8PSK for data, causing communication quality issues.
Innovation Solution
A maintaining device is implemented to compulsorily fix the gain of the gain control amplifier within a specified interval, using a latch circuit to set and maintain the gain value, with timer-based control signals determining the start and end of this interval, ensuring the gain remains constant during critical data transfer phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the gain control amplifier is switched based on RSSI detection, then the signal strength is adjusted to match reception conditions, but phase changes occur in the reception signal causing bit error rate deterioration
Solution Approach 1:
The invention applies preliminary action by fixing the gain control amplifier's gain during the header reception period before actual data reception begins. This prevents gain switching during critical data transmission, eliminating phase changes that would cause bit errors. The timer generates a fixation control signal that maintains constant gain during the header interval, ensuring stable signal processing before dynamic gain adjustment is needed for subsequent data packets.
Solution Approach 2:
The reception process is segmented into distinct time intervals: a header reception period where gain is fixed, and subsequent data reception periods where gain can be dynamically adjusted. The timer divides the reception timeline into these segments, applying different gain control strategies to each segment. This segmentation allows the system to prioritize stability during header processing while maintaining adaptability for ongoing data reception.
2Stability of the object's composition
If the gain control amplifier maintains constant gain during header interval, then phase stability is improved, but the ability to adapt to varying signal strengths is reduced
Solution Approach 1:
The system implements periodic action by alternating between fixed gain periods (during header reception) and adaptive gain periods (during data reception). The timer periodically generates fixation control signals that enable gain fixation during header intervals, then disables them to allow adaptive gain control during subsequent data intervals. This periodic switching between fixed and adaptive modes balances stability requirements with adaptability needs.
Solution Approach 2:
The gain control system transitions from a static constant-gain approach to a dynamic time-varying approach. The fixation control signal, generated by the timer, dynamically switches the gain control amplifier between fixed and adaptive modes based on the reception phase. This dynamic control allows the system to optimize performance for different operational requirements at different times, maintaining both stability and adaptability.
3Power
If gain switching is performed during data reception, then signal strength optimization is achieved, but communication quality deteriorates due to bit errors
Solution Approach 1:
The invention applies preliminary action by establishing stable gain during the header reception period before actual data transmission begins. This preliminary stabilization prevents gain-related phase changes during the critical data reception phase, ensuring that signal strength optimization does not compromise communication quality. The timer ensures gain fixation is in place before data reception starts.
Solution Approach 2:
The system skips gain switching during the header reception interval, rushing through this critical period with fixed gain to establish stable signal processing. By postponing adaptive gain switching until after the header is received, the system ensures that no gain changes occur during the vulnerable data reception phase, prioritizing communication reliability over signal strength optimization during critical intervals.
Data Source
AI summary
In a wireless receiver apparatus including a gain control amplifier for controlling a gain of a reception signal, a maintaining device compulsorily maintains the gain of the gain control amplifier at a predetermined fixed value only in a predetermined specified interval. The maintaining device includes a latch circuit for maintaining a gain set value immediately prior to the specified interval. A start timing of the specified interval is determined by an edge of a predetermined timer start signal, and a duration of the specified interval is determined on the basis of a count of a predetermined timer clock signal and a count of a predetermined timer count set bus signal.