Low-power dtmb transmitter carrier recovery and constellation mapping enhancement method and platform

By setting up a feedback sampling link and a digital phase-locked loop in the DTMB transmitter, and combining carrier self-calibration and constellation pre-compensation with PN frame header mode, the self-calibration and compatibility issues of the DTMB transmitter are solved, achieving low power consumption and efficient frequency offset acquisition and phase tracking, thus improving transmission quality and compatibility.

CN122340286APending Publication Date: 2026-07-03贵州省广播电视局七六一台
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
贵州省广播电视局七六一台
Filing Date
2026-05-19
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional DTMB transmitters lack a real-time carrier self-calibration mechanism based on their own PN frame header and feedback sampling link. Fixed constellation mapping is difficult to compensate for constellation distortion caused by DAC, RF upconversion, IQ imbalance and power amplifier nonlinearity. Directly changing the air interface constellation can easily break the compatibility of ordinary DTMB receivers. There is a lack of unified feedback evaluation quantity between PN correlation estimation, digital phase-locked loop, constellation compensation, digital predistortion and power amplifier control. The baseband processing module and RF transmission module lack a low-power mechanism for dynamic scheduling based on locked state and signal quality.

Method used

A feedback sampling link is set up in the transmitter, and correlation estimation is performed in combination with the PN frame header mode. Carrier self-calibration and constellation convergence are achieved through digital phase-locked loop and constellation mapping pre-compensation mechanism. Low-power control module is used to coordinate the scheduling of hardware resources to ensure compatibility and low-power operation.

Benefits of technology

It achieves transmitter carrier self-calibration closed loop, improves frequency offset acquisition speed and phase tracking accuracy, reduces dynamic power consumption, ensures compatibility with ordinary DTMB receivers, and enhances phase noise and multipath resistance.

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Abstract

This invention discloses a low-power DTMB transmitter carrier recovery and constellation mapping enhancement method and platform, belonging to the field of terrestrial digital television broadcasting technology. The transmitter samples feedback signals from the intermediate frequency (IF), RF preamplifier, or power amplifier output. Based on the PN420, PN595, or PN945 frame header characteristics, it performs cyclic correlation, sliding correlation, or segmented correlation to obtain frequency offset, phase error, and correlation confidence, and drives a digital phase-locked loop to complete transmitter carrier self-calibration. The system generates non-uniform pre-scaling and pre-rotation parameters based on the feedback constellation error, causing the antenna port constellation to converge to a standard DTMB constellation; enhanced constellation mapping is enabled when supported by a dedicated receiver. The low-power control module reduces power consumption and improves transmission quality based on correlation confidence, EVM scheduling correlator, phase calculation, constellation pre-compensation, digital predistortion, and Doherty power amplifier bias.
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