Network Coding Beamforming Spectral Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving high spectral efficiency, especially in single frequency networks, due to error-prone wireless links and the inefficiency of existing error recovery mechanisms, which are ineffective in point-to-point or point-to-multi-point networks.
Innovation Solution
The integration of network coding by beam forming with user cooperation among mobile devices, where devices form subsets of beams to receive and recombine packets from multiple base stations, enabling simultaneous error correction and increasing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error recovery mechanisms are used in wireless communication systems, then reliability is improved, but spectral efficiency deteriorates due to redundancy in transmissions
Solution Approach 1:
The patent combines network coding with beam forming techniques to merge error correction functionality with data transmission. Multiple base stations transmit coded packets simultaneously through coordinated beam forming, allowing error recovery and data delivery to occur in the same transmission resources rather than requiring separate redundant transmissions.
Solution Approach 2:
The system dynamically changes transmission parameters including beam directions, coding coefficients, and packet combinations based on channel conditions and user requirements. This allows the system to adapt the level of error protection and spectral efficiency according to real-time needs, optimizing the trade-off between reliability and productivity.
2Reliability
If multiple base stations transmit the same information simultaneously in an SFN, then coverage and reliability are improved, but spectral efficiency deteriorates due to redundant transmissions
Solution Approach 1:
Instead of transmitting identical information from multiple base stations, the system segments the data into different coded packets with distinct network coding coefficients. Each base station transmits different linear combinations of original packets, reducing redundancy while maintaining the ability to recover complete information through cooperative reception and decoding.
3Reliability
If network coding is used to correct errors, then reliability is improved, but spectral efficiency deteriorates in point-to-point or point-to-multi-point networks where no errors occur
Solution Approach 1:
The system dynamically activates or deactivates network coding based on detected error conditions and user cooperation status. In error-free point-to-point scenarios, traditional transmission modes are used for maximum efficiency. In cooperative multi-user scenarios with detected errors, network coding is activated to provide error correction, making the system adaptive to actual channel conditions rather than always applying the same overhead.
Data Source
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AI summary
Network coding by beam forming in networks, for example, in single frequency networks, can provide aid in increasing spectral efficiency. When network coding by beam forming and user cooperation are combined, spectral efficiency gains may be achieved. According to certain embodiments, a method includes operating a user equipment of a plurality of user equipment in a network comprising a plurality of access points. The method also includes the user equipment forming a beam. The method further receives processing received signals from at least one of the plurality of access points at the user equipment. The forming the beam is configured to let different user equipment of the plurality of user equipment to receive different signals from the plurality of access points to achieve diversity by using different beams amongst the plurality of user equipment. The method additionally includes cooperating with the plurality of user equipment to decode the received data.