Multisite Transmission Using Complementary Codes
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Solution Overview
Problem
Current multisite transmission techniques in mobile communication networks face challenges due to high requirements for coordination and synchronization, leading to impractical performance in achieving coherent signal addition at the receiver.
Innovation Solution
The implementation of complementary channel coding, where multiple sites transmit complementary codewords using a shared mother code, allowing the receiver to combine and decode signals with lower synchronization needs, utilizing parallel and serial multi-stage receiver structures for hard or soft signal reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current multisite transmission techniques are used to achieve coherent signal addition, then signal quality can be improved, but high requirements for coordination and synchronization make the system impractical
Solution Approach 1:
The transmission system is segmented into independent sites that transmit different complementary codewords rather than requiring coordinated transmission. Each site operates independently with its own encoder, eliminating the need for complex inter-site synchronization while still achieving reliable signal combination at the receiver through the complementary code structure
Solution Approach 2:
The system changes the coding parameter structure by using complementary codes instead of traditional coordinated modulation schemes. This parameter change allows independent site operation while maintaining the ability to combine signals effectively, resolving the contradiction between signal quality and coordination complexity
2Device complexity
If complementary channel coding is implemented with independent site transmission, then synchronization requirements are reduced, but signal combination effectiveness must be maintained
Solution Approach 1:
Complementary channel codes serve as an intermediary mechanism that enables effective signal combination without direct site coordination. The mathematical properties of complementary codes act as a mediator that ensures proper signal reconstruction at the receiver even when sites operate independently with different timing and frequency references
Solution Approach 2:
Each site transmits a complementary codeword that is mathematically related to the others, creating a structured copy relationship rather than requiring identical signal copies. This copying approach with complementary structure maintains signal combination effectiveness while allowing independent transmission operations
Data Source
AI summary
A method of a transmitter enables multi-site wireless transmission using complementary channel coding. The method includes receiving a message to be transmitted to a receiver, encoding the message as a first codeword using a shared mother code, parsing the first codeword into a first complementary codeword of a set of complementary codewords specific to the first codeword, determining a set of shared channel resources and a configuration of the transmitter to be utilized to transmit the first complementary codeword, and transmitting the first complementary codeword to the receiver.