Octal Code Generation for Mobile Cell Identification
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Solution Overview
Problem
In mobile communication systems, particularly in orthogonal frequency division multiple access (OFDMA) systems, existing cell identification codes are susceptible to errors over channels, leading to inefficient cell identification and increased hardware complexity due to high transmit power requirements and limited Node B identification capabilities.
Innovation Solution
The use of an octal code with a minimum Hamming distance of 10 or higher, generated using a linear binary code with a minimum Hamming distance of 16, is implemented to improve cell identification performance by minimizing cross-correlation and maximizing auto-correlation, thereby reducing detection errors and hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cell identification codes are used in OFDMA systems, then Node B identification is performed, but detection errors increase due to susceptibility to channel errors
Solution Approach 1:
The patent changes the fundamental parameter of the identification code from conventional binary codes to octal codes with minimum Hamming distance of 10 or higher. This parameter change increases the error detection capability and reduces susceptibility to channel errors, directly improving cell identification accuracy in OFDMA systems.
Solution Approach 2:
The patent combines octal code structure with high minimum Hamming distance properties to create a composite identification code system. This composite approach integrates the advantages of octal representation with error-resistant coding, resulting in improved reliability against channel-induced errors.
2Ease of operation
If conventional identification codes are used, then cell identification is performed, but hardware complexity increases due to high transmit power requirements
Solution Approach 1:
By changing the code structure to octal codes with minimum Hamming distance of 10, the patent improves detection efficiency without requiring increased transmit power. This parameter change allows the system to maintain ease of operation while reducing the hardware complexity associated with high power amplification requirements.
Data Source
AI summary
An apparatus and method for generating an octal code for identifying cells in a mobile communication system. In the octal code generating apparatus, a binary code generator generates a binary code with a predetermined minimum Hamming distance. A column permutator permutes the order of columns of the binary code in a predetermined interleaving method. A 3-bit combiner generates a plurality of codewords using the column-permuted binary code as a generator matrix and groups the bits of each of the codewords by threes. An octal code generator converts the 3-bit grouped binary codewords to octal code sequences.