LTE Physical Broadcast Channel Decoding Using Bit Masks
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Solution Overview
Problem
Current methods for decoding a Physical Broadcast Channel (PBCH) in LTE systems require a high number of decoding processes to detect Master Information Block (MIB) information, specifically needing 12 operations to find transmission frame numbers and the number of transmit antennas, which increases computational load.
Innovation Solution
A method that calculates shifted bit values using a 31-bit shift register and performs exclusive-OR operations to extract frame numbers and CRC checks to determine the number of transmit antennas, reducing the number of decoding processes by using bit masks and efficient CRC checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding method is used to detect transmission frame numbers and number of transmit antennas, then reliability of MIB detection is improved, but computational load and decoding time increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing bit masks corresponding to all possible frame numbers (0-3) and transmit antenna configurations (1-8) before the actual decoding process. During decoding, these pre-computed bit masks are directly applied to the received PBCH signal through bitwise AND operations, eliminating the need for exhaustive blind decoding while ensuring reliable detection of all possible transmission parameters.
2Measurement precision
If exhaustive blind decoding is performed for all possible frame numbers and antenna configurations, then detection accuracy is improved, but processing time increases to 12 operation processes
Solution Approach 1:
The patent segments the decoding process into two independent stages: first, applying pre-computed bit masks to extract candidate frame numbers and antenna configurations; second, performing CRC checks only on the candidates identified by the bit masks. This segmentation reduces the search space from exhaustive decoding to targeted verification, achieving detection accuracy equivalent to exhaustive methods while reducing processing time significantly.
Solution Approach 2:
The patent performs preliminary computation of bit masks for all possible frame numbers and antenna configurations before actual decoding. These pre-computed masks are stored and directly applied during reception, eliminating the need for time-consuming blind decoding operations while maintaining the ability to accurately detect any possible transmission parameter combination.
Data Source
AI summary
The present invention relates, in general, to a method of decoding a Physical Broadcast Channel (PBCH) in a Long Term Evolution (LTE) system and, more particularly, to a method of detecting a Master Information Block (MIB) contained in a PBCH.