Frequency Interleaver Seed Dynamics for Broadcast Signal Diversity
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Solution Overview
Problem
Current digital broadcasting systems face challenges in data transfer efficiency, robustness of transmission/reception networks, and network flexibility, particularly in mobile reception, due to limitations in frequency diversity and interleaving techniques.
Innovation Solution
The implementation of a method that utilizes different interleaving seeds for each OFDM symbol pair in a Frequency Interleaver (FI) to maximize frequency diversity, along with a broadcast signal receiving method that includes demodulation, parsing, and decoding processes to determine if a frequency interleaver is used, and performs frequency deinterleaving using a single memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single interleaving seed is used for frequency interleaving, then the device complexity is reduced, but the frequency diversity effect is insufficient
Solution Approach 1:
The patent applies dynamics by changing the interleaving seed dynamically for each OFDM symbol pair instead of using a fixed seed. This allows the frequency interleaver to adapt to varying channel conditions, maximizing frequency diversity effect while maintaining a relatively simple device structure by reusing the same interleaver with different seeds.
Solution Approach 2:
The patent changes the parameter (interleving seed) for each OFDM symbol pair to achieve different interleaving patterns. This parameter change enables the system to exploit frequency diversity without requiring multiple separate interleavers, thus resolving the contradiction between reliability and device complexity.
2Reliability
If frequency interleaving is always applied, then frequency diversity is improved, but the adaptability to different transmission conditions is reduced
Solution Approach 1:
The system dynamically selects whether to apply frequency interleving based on transmission conditions, service types, and channel characteristics. This dynamic adaptability allows the system to optimize transmission robustness for different scenarios while maintaining flexibility in transmission modes.
Solution Approach 2:
The patent introduces controllable parameters (interleving seed, interleving depth, and interleving enable/disable flag) that can be adjusted according to transmission conditions. This allows the system to adapt frequency interleving to different transmission modes and service requirements, resolving the contradiction between reliability and adaptability.
3Reliability
If multiple interleaving seeds are used for different OFDM symbol pairs, then frequency diversity is maximized, but the processing complexity increases
Solution Approach 1:
The patent segments the transmission into OFDM symbol pairs, each with its own interleaving seed. This segmentation allows frequency diversity to be maximized across different symbol pairs while keeping the processing complexity manageable by handling one symbol pair at a time with its specific seed.
Solution Approach 2:
By changing the interleving seed parameter for each OFDM symbol pair, the system achieves maximum frequency diversity effect without requiring fundamentally more complex processing architecture. The same interleaver structure is reused with different seed parameters, controlling the increase in processing complexity.
Data Source
AI summary
Disclosed herein is a method of receiving a broadcast signal. The method comprises receiving the broadcast signal; an Orthogonal Frequency Division Multiplexing (OFDM) demodulating on the received broadcast signal; parsing at least one signal frame from the demodulated broadcast signal to extract service data or service component data; converting the service data or service component data into bits; decoding the converted bits; and outputting a data stream comprising the decoded bits.