Partial Demodulation Error Checker for Channel Quality Measurement
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Solution Overview
Problem
Conventional error checkers in communication systems that determine the quality of multi-bit symbol transmission channels are costly, complex, and consume significant power due to the need for multiple detectors operating at the symbol rate to fully demodulate received signals.
Innovation Solution
An error checker that partially demodulates multi-bit symbols, using a single detector and varying thresholds to identify and verify bits, allowing synchronization and inference of the pseudo-random bit sequence, thereby reducing the number of detectors required and operating at a lower sample rate to infer channel quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple detectors operate at symbol rate to fully demodulate received signals, then measurement precision of channel quality is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies partial demodulation by using a single detector operating at a reduced sample rate (lower than symbol rate) to process only sufficient portions of the received signal. This partial action approach maintains adequate channel quality measurement capability while avoiding the need for multiple full-rate detectors, thereby reducing device complexity and power consumption.
Solution Approach 2:
The patent changes the operational parameters of the detector by operating at a reduced sample rate rather than the full symbol rate. This parameter change allows the system to achieve acceptable measurement precision with reduced computational burden, lowering both device complexity and power consumption while maintaining essential channel quality assessment functionality.
2Measurement precision
If multiple detectors operate at symbol rate to fully demodulate received signals, then measurement precision of channel quality is improved, but power consumption increases
Solution Approach 1:
The patent implements partial demodulation using a single detector at reduced sample rate, performing only the minimum necessary processing to assess channel quality. This partial action significantly reduces power consumption compared to full demodulation with multiple detectors, while maintaining sufficient measurement precision for practical applications.
Solution Approach 2:
By changing the detector's sample rate parameter from symbol rate to a lower rate, the patent reduces the computational workload and energy consumption. This parameter adjustment maintains adequate measurement capability while achieving substantial power savings in the error checker.
3Device complexity
If a single detector operates at reduced sample rate for partial demodulation, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent carefully calibrates the partial demodulation approach to perform exactly the right amount of processing - sufficient to capture essential channel quality information while avoiding unnecessary complexity. The reduced sample rate is specifically chosen to maintain measurement adequacy, achieving a balance where measurement precision remains sufficient for practical error detection.
Data Source
AI summary
This application relates to determining transmission quality of a communication channel, in particular for determining a measure of errors in data transmitted as multi-bit symbols. Described is an error checker with an input for receiving an input signal comprising a series of modulated symbols, wherein each symbol encodes multiple bits of a pseudo-random bit sequence. A demodulator is configured to receive the input signal and only partially demodulate at least some of the symbols to generate a partially demodulated bit sequence. A PRBS module is configured to receive the partially demodulated bit sequence and determine the pseudo-random bit sequence and a comparator compares the output of the demodulator to an expected output based on the pseudo-random bit sequence determined by the PRBS module.