Demapping Apparatus Using Band Segmentation for Mobile Broadcast Reception
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Solution Overview
Problem
Mobile receivers in multi-carrier broadcast systems face challenges in processing larger channel bandwidths due to limited processing power and the need for low power consumption, especially in handheld devices, which is difficult to achieve with existing technologies optimized for fixed, stationary reception.
Innovation Solution
The apparatus and method involve constructing a demapping output data stream with alternating frames of different structures, using band segmentation in the second frames to reduce power consumption and enable narrow-band receiver usage, and employing absolute OFDM and unique pilot patterns to enhance signal recognition and robustness for mobile receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed channel bandwidth is used for broadcast transmission, then transmission stability is improved, but mobile receivers with limited processing power cannot handle larger bandwidths up to 20 MHz
Solution Approach 1:
The broadcast signal is segmented into multiple sub-bands or frequency segments, allowing mobile receivers to process only the necessary bandwidth portion rather than the entire 20 MHz channel, thus reducing processing requirements while maintaining transmission stability
Solution Approach 2:
The system dynamically adjusts the channel bandwidth allocation based on receiver type - fixed receivers receive the full bandwidth while mobile receivers receive segmented portions, enabling adaptability without compromising overall transmission stability
2Reliability
If full channel bandwidth is processed by mobile receivers, then reception completeness is improved, but power consumption increases significantly
Solution Approach 1:
The necessary signal components are extracted from the full channel bandwidth and presented to mobile receivers in a reduced format, allowing complete reception of required data while consuming significantly less power by processing only essential signal portions
3Productivity
If stationary receiver optimization is used, then processing efficiency is improved, but mobile and handheld reception requirements are not met
Solution Approach 1:
The broadcast system is designed with multi-functionality to serve both stationary and mobile receivers through a unified transmission framework that adapts the signal presentation based on receiver type, maintaining processing efficiency for stationary receivers while enabling mobile reception capability
Data Source
AI summary
An apparatus and method demapping a demapping input data stream having a channel bandwidth received in a multi-carrier broadcast system into a demapping output data stream. A stream demapping mechanism demaps second frames from the demapping input data stream, and a frame demapping mechanism demaps the second frames including a preamble portion and a payload portion into the demapping output data stream. The frame demapping mechanism demaps signalling data from the preamble portion, which includes at least one preamble symbol carrying at least one preamble signalling block including signalling data, and demaps data blocks of the demapping output data stream from the payload portion by using signalling information. Payload data are mapped onto the payload portion including plural data symbols carrying payload data of at least two mapping input data streams, the payload portion being segmented into data segments each covering a bandwidth portion of the channel bandwidth.