Signal Reception Preamble Detection for Stable T2 Frame Correction
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Solution Overview
Problem
Reception apparatuses face challenges in maintaining stability and noise-resisting performance when starting to receive signals that include signals other than T2 frames, particularly due to the uncertainty in discriminating between T2 frames and Future Extension Frames (FEF) during the initial demodulation process, which restricts operations and can lead to difficulties in carrier frequency correction and data decoding.
Innovation Solution
The reception apparatus includes acquisition means for detecting preamble signals, detection means for identifying carrier displacement, and correction means that adjust based on the detected values, allowing for correction of signals if they are identified as T2 frames while abandoning corrections if they are not, thereby improving stability and noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reception apparatus performs carrier frequency correction using detected values during initial reception, then the correction accuracy is improved, but the stability deteriorates when receiving signals that include frames other than T2 frames
Solution Approach 1:
The reception apparatus dynamically adjusts its operation mode based on the reception state. During initial reception, it operates in a first mode where carrier frequency correction is performed using detected values from the signal. Once the reception is established and stability is achieved, it transitions to a second mode where such correction is suppressed. This dynamic switching resolves the contradiction by allowing high correction accuracy during initialization while ensuring stability during normal operation.
Solution Approach 2:
The apparatus performs preliminary carrier frequency correction using detected values during the initial reception phase before full signal stability is achieved. This preliminary action addresses the frequency offset issue at the start when no stable reference is available, improving initial acquisition accuracy without affecting the stability of subsequent reception.
2Productivity
If the reception apparatus performs data decoding during initial reception phases, then the reception speed is improved, but the noise-resisting performance deteriorates
Solution Approach 1:
The reception apparatus employs periodic action by dividing the reception process into distinct phases: an initial reception phase where data decoding is performed to achieve quick acquisition, and a subsequent stable reception phase where decoding is suppressed to ensure noise-resisting performance. This periodic switching between decoding and non-decoding states resolves the contradiction between reception speed and noise resistance.
3Measurement precision
If the reception apparatus uses detected correction values during initial reception, then the carrier frequency offset correction is improved, but the reception stability deteriorates when signals include mixed frame types
Solution Approach 1:
The apparatus dynamically switches between two operational modes based on reception state. In the first mode during initial reception, it actively performs carrier frequency offset correction using detected values from the signal. In the second mode during stable reception, it suppresses such correction operations. This dynamic adaptation allows precise offset correction when needed while maintaining stability when the signal is already established.
Data Source
AI summary
Disclosed herein is a reception apparatus, including an acquisition section adapted to receive a signal which includes at least one of a first signal and a second signal which have different structures from each other except that the first and second signals have a preamble signal and acquire the preamble signal from the received signal; a detection section adapted to detect a value for correcting the signal using the signal; and a correction section adapted to correct, if it is decided based on the preamble signal acquired by the acquisition section that the signal is the first signal, the signal using the value detected by the detection section.