Broadcast Signal Reception With Subband PLP Mapping and Pilot Estimation
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting high-capacity data, robustness in mobile environments, and flexibility in frequency allocation, particularly in receiving mobile broadcast signals without additional frequency allocation and minimizing power consumption.
Innovation Solution
A broadcast signal receiving apparatus and method that utilize a MIMO system with a pilot pattern and preamble symbols to enhance channel estimation and error correction, allowing for efficient data transmission and reception in mobile environments by mapping PLP to a subband unit narrow frequency domain and using a 9th pilot pattern for robust channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional broadcast signals are received using conventional RF signals without additional frequency allocation, then frequency utilization efficiency is improved, but signal reception robustness in mobile environments deteriorates
Solution Approach 1:
The broadcast signal is segmented into multiple PLPs (Physical Layer Pipes) that are mapped to different subbands in the frequency domain. This segmentation allows the system to utilize existing frequency resources more efficiently while providing diversity against frequency-selective fading, thereby maintaining robustness in mobile environments without requiring additional frequency allocation.
Solution Approach 2:
The system changes the parameter of pilot pattern configuration to a 9th pilot pattern with increased pilot density in critical frequency regions. This parameter change enhances channel estimation accuracy for the additional broadcast signals, improving reception robustness while utilizing the same RF frequency band as conventional systems.
2Use of energy by moving object
If PLP is mapped to subband unit narrow frequency domain, then power consumption is minimized, but data transmission capacity is reduced
Solution Approach 1:
The frequency domain is segmented into multiple subbands, and PLPs are mapped to these subbands in a distributed manner. This segmentation enables the receiver to process signals in smaller frequency units, reducing the complexity and power consumption of signal processing while maintaining overall data transmission capacity through the aggregate of multiple subbands.
Solution Approach 2:
Different subbands are allocated to different PLPs with localized mapping strategies optimized for each subband's channel characteristics. This local quality approach allows the system to minimize power consumption in each subband processing while collectively achieving high data transmission capacity across the entire frequency spectrum.
3Measurement precision
If a 9th pilot pattern is inserted for robust channel estimation, then channel estimation accuracy is improved, but signal frame overhead is increased
Solution Approach 1:
The 9th pilot pattern is designed with non-uniform pilot distribution, concentrating pilot signals in frequency regions that experience severe fading or require accurate channel estimation. This local quality approach improves channel estimation accuracy where needed while minimizing the overall pilot overhead in the signal frame by reducing pilot density in regions with better channel conditions.
4Reliability
If preamble symbols are additionally allocated to signal frame, then robustness against burst fading is improved, but transmission efficiency is reduced
Solution Approach 1:
Preamble symbols are allocated at the beginning of the signal frame structure, performing preliminary channel estimation and synchronization before the main data transmission. This preliminary action establishes a reliable channel reference that helps the system combat burst fading effects during data transmission, while the structured allocation minimizes the proportion of overhead symbols.
Solution Approach 2:
The signal frame structure incorporates preamble symbols at periodic intervals, creating a regular pattern that enables continuous channel tracking and burst fading mitigation. This periodic allocation of preamble symbols maintains transmission robustness while optimizing the balance between overhead and data transmission efficiency through regular, predictable frame structures.
Data Source
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AI summary
Disclosed are a broadcast signal transmitting apparatus, a broadcast signal receiving apparatus, and a method for transceiving a broadcast signal in a broadcast signal transceiving apparatus. A method for transmitting a broadcast signal comprises the following steps: receiving a broadcast signal transmitted via first and second transmitting antennas, while maintaining the bandwidth of a sub-band constant and changing a tuning frequency for each cell unit, wherein the received broadcast signal includes a signal frame; detecting first and second preamble signals inserted into the signal frame; identifying the pilot location inserted into the signal frame on the basis of the FFT size information contained in the detected first preamble signal and the pilot pattern information contained in the detected second preamble signal, estimating a transmitting channel through which said broadcast signal is transmitted, using the pilot signal at the identified pilot location, and performing channel equalization; and correcting errors of the channel-equalized broadcast signal.