Uplink Signal Decoding Using Estimated Interference Side Information
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Solution Overview
Problem
In centralized radio access networks, uplink communications face challenges in reducing bandwidth overhead due to interference and noise in signals transmitted from remote radio heads to network nodes, limiting effective bandwidth reduction.
Innovation Solution
Implementing a method and apparatus that decodes encoded uplink signals using an estimated interference signal as side information, employing a practically disconnected many-to-one encoding scheme, where network nodes instruct receive points on encoding parameters such as sampling rate, bit reduction, and encoding operations to reduce bandwidth, and using non-linear operators like modulo operations and Wyner-Ziv coding to lower dynamic range and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bandwidth reduction methods are applied to uplink communications, then bandwidth overhead is reduced, but signal quality deteriorates due to interference and noise
Solution Approach 1:
The patent segments the uplink signal processing into two stages: first applying bandwidth reduction encoding to compress the signal, then applying interference cancellation processing to restore signal quality. This segmentation allows each processing stage to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent performs preliminary interference estimation and cancellation before final signal decoding. By preemptively removing interference components from the bandwidth-reduced signal, the system prepares the signal in advance for more accurate decoding, thereby maintaining signal quality despite bandwidth compression.
2Reliability
If signals are transmitted with full bandwidth from RRH to network node, then signal quality is maintained, but bandwidth overhead increases
Solution Approach 1:
The patent changes the bandwidth parameter of the uplink signal by applying many-to-one encoding that reduces the signal dimensionality. The encoding transforms high-bandwidth signals into lower-bandwidth representations while preserving essential information, thereby reducing bandwidth overhead without completely sacrificing signal quality.
Solution Approach 2:
The patent introduces an intermediary interference cancellation stage between the bandwidth-reduced signal transmission and the final decoding process. This intermediary processing recovers signal quality by removing interference components that were introduced during bandwidth reduction, effectively mediating between bandwidth constraints and quality requirements.
3Measurement precision
If interference cancellation is performed at the network node, then signal processing accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service interference cancellation where the system uses its own transmitted pilot signals and channel state information to generate interference estimates for cancellation. The network node leverages its own knowledge of the communication channel and transmitted signals to perform interference removal without requiring external assistance, thereby improving accuracy while limiting complexity growth.
Solution Approach 2:
The patent employs feedback mechanisms where the network node uses received signals to estimate interference components, then feeds this interference estimate back into the decoding process for cancellation. This feedback loop continuously refines interference cancellation accuracy while maintaining manageable system complexity through iterative processing.
Data Source
AI summary
There is provided a method of decoding an encoded uplink signal, in accordance with embodiments of the present invention. The method comprises a network node receiving an encoded uplink signal from a receive point, and decoding the encoded uplink signal using an estimated interference signal as side information input. The encoded uplink signal was encoded with a practically disconnected many-to-one encoding scheme. There is also provided a network node comprising a decoder. The decoder is configured to receive an encoded wireless uplink signal from a receive point, and decode the encoded wireless uplink signal using an estimated interference signal as side information. The encoded uplink signal was encoded with a practically disconnected many-to-one encoding scheme.