DTMB Receiver Carrier Scheme Detection via Trial Demodulation
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Solution Overview
Problem
DTMB standard reception apparatuses face challenges in accurately detecting carrier schemes due to the short bit sequence used for signal discrimination, leading to erroneous detection in multi-path signal environments.
Innovation Solution
A reception apparatus and method that includes a demodulation control section to repeatedly try single-carrier and multi-carrier demodulation based on preset rules, with a common demodulation front-end and unique back-end sections for each scheme, and stops trials after a maximum number of attempts, ensuring accurate carrier scheme detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a short bit sequence (4 bits) is used for carrier scheme discrimination in system information, then the signaling overhead is reduced and transmission efficiency is improved, but the detection reliability deteriorates in multi-path signal environments leading to erroneous detection
Solution Approach 1:
The patent introduces a trial demodulation mechanism as an intermediary verification step. Instead of directly relying on the short 4-bit signal in system information for carrier scheme detection, the receiver performs trial demodulation using both single-carrier and multi-carrier schemes, then selects the correct scheme based on demodulation success. This intermediary process validates the detection result, resolving the contradiction between using short signaling and ensuring reliable detection.
2Reliability
If multiple trial demodulations are performed to ensure accurate carrier scheme detection, then the detection reliability is improved, but the processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by performing trial demodulation with a limited number of attempts before finalizing the carrier scheme detection. The system预先 sets a maximum number of trials and performs demodulation attempts in advance according to a predetermined rule, stopping as soon as successful demodulation is achieved or the trial limit is reached. This prevents excessive processing time while ensuring reliable detection through multiple controlled attempts.
3Adaptability or versatility
If both single-carrier and multi-carrier demodulation capabilities are implemented, then the adaptability to different transmission schemes is improved, but the device complexity increases
Solution Approach 1:
The patent merges the single-carrier and multi-carrier demodulation capabilities into a unified trial demodulation framework. Both demodulation schemes are implemented within the same receiver architecture, sharing common functional blocks such as the FFT/IFFT processor and signal processing units. The system combines these capabilities by sequentially trying each scheme according to a predetermined rule, selecting the working scheme based on trial results, thus achieving versatility without proportionally increasing overall system complexity.
Data Source
AI summary
A reception apparatus includes: a reception section configured to receive a signal modulated by one of a single-carrier scheme and a multi-carrier scheme that are specified by a predetermined standard; a single-carrier demodulation section configured to execute single-carrier demodulation based on the single-carrier scheme onto the signal; a multi-carrier demodulation section configured to execute multi-carrier demodulation based on the multi-carrier scheme onto the signal; and a demodulation control section configured to control such that one of the single-carrier demodulation and the multi-carrier demodulation is tried on the received signal in accordance with a preset predetermined rule.