Zero-Bit Padding Channel Encoding for Data Rate Matching
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Solution Overview
Problem
The existing channel encoding and decoding methods incur unnecessary throughput due to redundant zero bits inserted to adjust the codec data rate to match the modem data rate, which can lead to underflow or overflow of data, disrupting communication.
Innovation Solution
A broadcast signal transmitting and receiving method that generates a first bitstream, adds zero bits based on the difference between the modem and codec data rates, and uses zero padding information for channel encoding and decoding to maintain uniform bitstream sizes, thereby optimizing data transmission and reducing operational resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If zero bits are inserted to adjust the codec data rate to match the modem data rate, then the data rate matching is improved, but the throughput efficiency deteriorates due to processing redundant zero bits
Solution Approach 1:
The patent segments the bitstream into two distinct parts: valid data bits and zero padding bits. By separating these segments and processing them differently (channel encoding only for valid data bits), the system maintains data rate matching while avoiding the overhead of encoding redundant zero bits, thus resolving the throughput efficiency problem
Solution Approach 2:
The patent extracts the zero padding bits from the channel encoding process by using zero padding information to indicate the number of zero bits. This allows the channel encoder to process only the necessary valid data bits while still achieving the required data rate matching, thereby improving throughput efficiency
2Adaptability or versatility
If zero bits are added to adjust data rate difference, then the data rate synchronization is improved, but the operational complexity increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by pre-calculating and transmitting zero padding information that indicates the number of zero bits to be added. This allows the receiver to anticipate and prepare for the zero padding, eliminating the need for complex real-time detection and processing of zero bits, thus reducing operational complexity while maintaining data rate synchronization
3Adaptability or versatility
If channel encoding is performed on zero bits, then the data rate adjustment is achieved, but the encoding efficiency deteriorates due to processing non-informational bits
Solution Approach 1:
The patent extracts zero bits from the channel encoding input by using zero padding information to specify their count. The channel encoder processes only the valid data bits (total bits minus zero bits), while the zero bits are appended separately. This extraction eliminates the waste of encoding resources on non-informational bits while maintaining the required data rate adjustment
Solution Approach 2:
The patent applies local quality by treating different parts of the bitstream differently: valid data bits undergo full channel encoding for error protection, while zero padding bits are simply appended without encoding. This differentiated processing optimizes encoding efficiency by applying computational resources only where necessary, while still achieving data rate adjustment
Data Source
AI summary
Provided is a broadcast signal transmitting method including: generating a first bitstream including encoded data; generating a second bitstream by adding zero bits to the first bitstream, based on a difference between a modem data rate and a codec data rate; generating a third bitstream by encoding the second bitstream by using zero padding information about the zero bits; and transmitting a carrier signal generated by modulating the third bitstream.