Frame Synchronizer Circuit Memory Compression
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Solution Overview
Problem
Existing frame synchronizer circuits in telecommunications systems face inefficiencies due to high memory requirements and prolonged reframe times caused by the random nature of telecommunications signals, where mimic patterns can tie up memory locations and hinder the detection of actual framing patterns.
Innovation Solution
A frame synchronizer circuit with reduced memory requirements uses data compression to encode framing states, leveraging statistical frequencies to represent common states with fewer bits, allowing for efficient storage and rapid detection of framing patterns without excessive reframe times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional frame synchronizer circuits use full memory to store framing states for all bit positions, then detection accuracy is maintained, but memory requirements become excessively high and reframe times increase
Solution Approach 1:
The patent applies local quality by differentiating the storage requirements for different bit positions based on their statistical characteristics. Instead of uniformly storing framing states for all bit positions, the system identifies and stores states only for bit positions that statistically exhibit framing pattern characteristics, thereby reducing overall memory requirements while maintaining detection accuracy.
Solution Approach 2:
The patent changes the parameter of state encoding by using variable-length encoding schemes. Common framing states are represented with fewer bits while less frequent states use more bits, optimizing the memory usage based on the statistical distribution of framing patterns in telecommunications signals.
2Reliability
If traditional frame synchronizer circuits monitor all bit positions continuously, then framing pattern detection is thorough, but reframe times are prolonged due to mimic patterns
Solution Approach 1:
The patent applies preliminary action by pre-identifying bit positions that statistically exhibit framing pattern characteristics before actual framing detection is needed. This allows the system to focus monitoring resources on promising bit positions, reducing the time required to detect actual framing patterns and minimizing reframe times caused by mimic patterns.
Solution Approach 2:
The patent extracts and removes bit positions from continuous monitoring that do not statistically exhibit framing pattern characteristics. By taking out non-promising bit positions from the monitoring scope, the system reduces false detections from mimic patterns and accelerates the framing detection process.
3Device complexity
If frame synchronizer circuits use simple state encoding, then implementation is straightforward, but memory usage increases significantly
Solution Approach 1:
The patent applies parameter changes by implementing variable-length state encoding where the number of bits used for encoding depends on the statistical frequency of the state. This allows efficient memory usage by assigning shorter codes to frequent states and longer codes to rare states, optimizing the balance between encoding complexity and memory requirements.
Data Source
AI summary
Systems and methods are disclosed for detecting framing data in a telecommunications signal. In one embodiment, a frame synchronizer circuit is provided that includes an interface for receiving bits of a telecommunications signal and storage for storing a framing state for the bit positions in the frame, the framing state for a given bit position indicating whether that bit position is a potential holder of the frame synchronization pattern. The frame synchronizer circuit also contains a state update function that determines the current-state for each bit position based on the bit position's previous state, and the value of the most recently received bit in that bit position. The encoding scheme makes use of shorter bit length symbols to represent statistically more frequently occurring states. In one embodiment, a single code word is used to record the state of a sequence of consecutively occurring bit positions that share the same state.