T-MMB Receiver Compatible with DAB via Advanced Modulation
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Solution Overview
Problem
Current Terrestrial Mobile Multimedia Broadcasting (T-DMB) and DVB-H standards face issues with low frequency spectrum efficiency, insufficient information throughput for high-quality mobile TV services, and inadequate energy-saving mechanisms, leading to reliability concerns in multimedia broadcasting.
Innovation Solution
A terrestrial mobile multimedia broadcasting receiver compatible with DAB, incorporating RF demodulation, synchronization, OFDM demodulation, and channel demodulation units, which identifies transmission modes and performs RF, OFDM, and channel demodulation to extract control information and data symbols, enhancing signal synchronization and error correction for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If T-DMB standard is used for digital multimedia broadcasting, then mobile reception reliability is improved, but frequency spectrum efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the modulation schemes used in T-DMB system. It introduces advanced modulation techniques including 16APSK (16-level Amplitude Phase Shift Keying) and 8DPSK (8-level Differential Phase Shift Keying) in addition to the conventional 4DPSK, thereby increasing the data carrying capacity per Hertz of spectrum while maintaining the robustness of T-DMB for mobile reception.
2Reliability
If T-DMB standard is used for digital multimedia broadcasting, then mobile reception reliability is improved, but information throughput deteriorates
Solution Approach 1:
The patent increases information throughput by changing the modulation parameters from conventional 4DPSK to higher-order modulation schemes such as 16APSK and 8DPSK. These advanced modulation techniques enable more bits to be transmitted per symbol, thereby increasing the overall data throughput while preserving the error correction capabilities that ensure reliable mobile reception.
3Productivity
If DVB-H standard is used for digital multimedia broadcasting, then frequency spectrum efficiency is improved, but energy saving capability deteriorates
Solution Approach 1:
The patent achieves multi-functionality by designing a receiver that can operate with multiple modulation schemes (4DPSK, 8DPSK, 16APSK) within a single T-DMB framework. This universal approach allows the system to achieve high frequency spectrum efficiency through advanced modulation while maintaining the energy-saving capabilities inherent in T-DMB's mobile-optimized design, unlike DVB-H which sacrifices energy efficiency for spectrum efficiency.
4Productivity
If advanced modulation schemes are introduced, then frequency spectrum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the signal processing into distinct modules: RF demodulation, synchronization, OFDM demodulation, and channel demodulation/decoding. Each module handles specific tasks, and the receiver can selectively activate processing for different modulation schemes (4DPSK, 8DPSK, 16APSK) based on what is being received, thereby managing device complexity while supporting advanced modulation for improved spectrum efficiency.
Data Source
AI summary
The invention discloses a Terrestrial Mobile Multimedia Broadcasting T-MMB receiver compatible with Digital Audio Broadcasting DAB, wherein the receiver comprises a RF demodulation unit, a synchronization unit, an Orthogonal Frequency Division Multiplexing OFDM demodulation unit and a channel demodulation and decoding unit. The invention utilizes the ideal base band model and the synchronization position of the T-MMB system and characteristics of the T-MMB channel to identify a transmission mode of the received signal; and RF demodulate, OFDM demodulate and channel decode the received signal. Moreover, in the OFDM demodulation process, the control information in the FIC can be obtained, and the data can be demodulated according to the obtained control information, to thereby implement the T-MMB receiver compatible with the DAB system which improves the reliability of the multimedia broadcast service.