Space-Time Line Coding for Full Diversity Gain
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Solution Overview
Problem
Existing space-time coding methods fail to achieve full space diversity gain when only the transmitting end has channel information in wireless communication systems with M/2 antennas at the transmitting end and two antennas at the receiving end.
Innovation Solution
A space-time line coding method that encodes information symbols using channel state information at the transmitting end and combines received signals without channel state information at the receiving end, utilizing specific encoding and decoding matrices to achieve full space diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If space-time coding methods (MRC, MRT, STBC) are used in wireless transmission/reception systems with M/2 antennas at transmitting end and two antennas at receiving end, then communication reliability is improved through diversity technique, but full space diversity gain M cannot be acquired when channel information is known only at transmitting end
Solution Approach 1:
The patent inverts the traditional space-time coding approach by designing a system where the transmitting end performs encoding using its available channel information, while the receiving end performs decoding without requiring channel information. This inversion allows the receiving end to achieve full space diversity gain M even though it lacks channel information, resolving the contradiction between reliability improvement and information availability constraints
Solution Approach 2:
The patent changes the parameter of channel information distribution from the traditional model (where receiving end has channel information) to a new model (where transmitting end has channel information). By modifying this key parameter and designing corresponding encoding/decoding operations, the system achieves full space diversity gain M under the new information distribution condition
2Measurement precision
If channel information is required at receiving end for traditional space-time decoding, then decoding accuracy is improved, but system complexity and information exchange requirements increase
Solution Approach 1:
The patent extracts the channel information requirement from the receiving end and relocates it to the transmitting end. The receiving end performs decoding operations without needing channel information, thereby reducing its complexity and information exchange requirements while maintaining decoding accuracy through the specially designed encoding scheme at the transmitting end
Data Source
AI summary
A space-time line coding system includes: in multiple antenna communication configured by at least one transmission antenna and at least two reception antennas, a transmitting end which encodes two information symbols using channel state information and sequentially transmits two encoded information symbols to a receiving end using the at least one transmission antenna; and a receiving end which receives two encoded information symbols using at least the two reception antennas and combines the received signals without channel state information.