Cooperative Relay Signal Processing for Wireless Networks
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Solution Overview
Problem
Cooperative relay in wireless telecommunication networks faces challenges in achieving accurate synchronization and power matching, requiring specific channel conditions, which increases design and measurement complexity, and limits performance improvement.
Innovation Solution
The method involves multiple relay devices processing and forwarding signals using space diversity or space multiplexing techniques, allowing for space diversity or space multiplexing gain by employing power control to ensure signals from different relay devices are at the same power level, and using specific encoding and decoding methods based on network topology and channel parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooperative relay combines signals from different relay stations, then signal reliability is improved, but synchronization accuracy and power matching requirements increase
Solution Approach 1:
The patent segments the cooperative relay process into distinct phases: broadcast phase where source transmits to all relays, receive phase where relays independently decode, and forward phase where relays transmit processed signals. This segmentation allows each relay to operate independently with simple decode-and-forward logic, eliminating complex synchronization and power matching requirements while maintaining signal reliability through diversity combining at the destination.
Solution Approach 2:
Each relay device autonomously performs signal reception, decoding, and retransmission without requiring coordination with other relays. The relays self-manage their operations independently, processing received signals and forwarding them based on local channel conditions, which simplifies the overall system complexity and removes the need for precise inter-relay synchronization.
2Reliability
If cooperative relay requires accurate synchronization and power match, then signal combining performance is improved, but system complexity increases
Solution Approach 1:
The patent divides the relay operation into independent time slots and phases, where relays receive, process, and forward signals in a structured sequence. This temporal segmentation allows simple independent operation at each relay without complex real-time coordination, reducing system complexity while maintaining effective signal combining through the structured phased approach.
Solution Approach 2:
Each relay independently copies the source signal through decode-and-forward operation, creating redundant signal paths without requiring precise coordination. This copying approach simplifies relay functionality to basic decoding and retransmission, reducing device complexity while the destination combines multiple copied signals to achieve reliable reception.
3Reliability
If cooperative relay uses specific channel conditions such as orthogonality, then signal processing performance is improved, but design and measurement difficulty increases
Solution Approach 1:
The patent changes the operational parameters of relay devices to operate in decode-and-forward mode with independent decoding at each relay. This parameter change eliminates the need for orthogonal channel conditions, as each relay processes signals independently based on local channel characteristics. The destination then combines signals from multiple relays, achieving good signal processing performance without requiring special channel orthogonality, thus simplifying design and measurement.
4Reliability
If cooperative relay improves performance, then system reliability is enhanced, but channel condition dependency increases
Solution Approach 1:
The patent segments the communication into broadcast and forward phases, where relays independently process signals based on their local channel conditions. This segmentation allows each relay to adapt to its own channel environment without requiring uniform channel conditions across all relays, reducing overall channel dependency while maintaining performance improvement through diversity.
Solution Approach 2:
The patent enables dynamic operation where each relay independently adjusts its transmission based on local channel conditions and received signal quality. This dynamic adaptability allows the system to maintain performance improvement across varying channel conditions, as relays can optimize their forward transmissions according to their specific channel environments rather than requiring uniform channel characteristics.
Data Source
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AI summary
The invention provides a method and device for cooperative relay with multiple relay stations in the wireless telecommunication network. To be specific, according to the invention, in single-hop or multi-hop relay telecommunication link, the relay device and other relay devices within the same hop select space diversity or space multiplexing to carry out cooperative relay operation according to the processing indicating information from the base station, thus obtaining space diversity gain and space multiplexing gain.