Non-Orthogonal Wireless Receiver Decoding Overlapping Signals
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Solution Overview
Problem
Current wireless communication systems face limitations in efficiently sharing system resources among multiple devices, leading to suboptimal capacity and increased latency, particularly in non-orthogonal multiple access scenarios where users may overlap or collide in time and frequency.
Innovation Solution
The implementation of a wireless communication device with a receiver circuit and decoder capable of receiving and decoding non-orthogonal uplink transmissions by employing joint modulation and coding techniques, using bit estimates from one data stream as a priori information to decode another, thereby facilitating simultaneous decoding of overlapping signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users share system resources non-orthogonally, then system capacity increases, but signal interference and decoding complexity increase
Solution Approach 1:
The patent applies preliminary action by performing channel estimation and obtaining bit estimates for one data stream before decoding the other data stream. The base station pre-processes the received signal to extract preliminary information (channel state, bit estimates) that will be used as a priori information in the subsequent decoding process. This advance preparation reduces the complexity of the joint decoding operation by organizing the interference cancellation steps in a structured sequence.
Solution Approach 2:
The patent implements feedback by using bit estimates from one data stream as a priori information for decoding the other data stream. The decoder feeds back the obtained bit estimates and uses them to improve the decoding of the remaining data streams. This iterative feedback process allows the system to progressively refine the decoding results and cancel interference more effectively, managing the decoding complexity through structured information reuse.
2Productivity
If multiple users transmit simultaneously in overlapping time and frequency resources, then resource utilization improves, but latency increases due to collision resolution
Solution Approach 1:
The patent applies continuity of useful action by enabling simultaneous decoding of multiple non-orthogonal data streams without requiring sequential collision resolution. The joint decoding process continuously processes all overlapping transmissions in parallel, using the received signal to extract information from multiple users at the same time. This eliminates the need to wait for collision resolution between users, maintaining continuous data transmission and reducing latency while improving resource utilization.
3Productivity
If joint modulation and coding techniques are employed for non-orthogonal transmissions, then decoding efficiency improves, but computational requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the joint decoding process into distinct sequential steps: first obtaining channel estimates, then obtaining bit estimates for one data stream, and finally using those bit estimates as a priori information to decode the other data stream. This segmentation of the decoding process into manageable stages reduces the immediate computational burden at any single point, making the overall process more tractable while maintaining high decoding efficiency through the structured approach.
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AI summary
Wireless communication devices are adapted to facilitate transmission and reception of non-orthogonal communications. In one example, wireless communication devices can encode an amount of data in accordance with information that at least some of the data will be transmitted as part of a non-orthogonal transmission. The wireless communication device may further transmit the encoded data, and the encoded data can be non-orthogonally combined as part of a non-orthogonal transmission. In another example, wireless communication devices can receive a wireless transmission including a plurality of data streams non-orthogonally combined together. The wireless communication device may decode at least one of the data streams. Other aspects, embodiments, and features are also included.