Non-Orthogonal Underlay Multiplexing for Wireless Resource Sharing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently sharing system resources among multiple devices, particularly in meeting the increasing demand for mobile broadband access and enhancing user experience through advanced resource sharing techniques.
Innovation Solution
The implementation of non-orthogonal underlay communications in wireless communication devices, which allow for the simultaneous use of the same time and frequency resources by devices employing different modulation types, such as orthogonal frequency division multiplexing (OFDM) and code division multiplexing (CDM), enabling efficient coexistence and decoding of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If orthogonal frequency division multiplexing (OFDM) is used for wireless communication, then spectral efficiency and data rate are improved, but resource utilization and device capacity are limited due to orthogonal resource allocation
Solution Approach 1:
The patent combines orthogonal OFDM signals with non-orthogonal underlay signals in the same time-frequency resources. The receiver decodes both signal types simultaneously by separating them through their different modulation characteristics, thereby merging two communication layers that traditionally would require separate resources.
Solution Approach 2:
The patent introduces a new dimension of non-orthogonal multiplexing alongside traditional orthogonal OFDM. By adding the underlay service dimension with different modulation schemes (e.g., spread spectrum, non-orthogonal multiple access), the system utilizes the same time-frequency resources in a multi-layered manner, effectively increasing resource utilization without sacrificing OFDM's spectral efficiency.
2Adaptability or versatility
If the same time and frequency resources are shared among multiple devices, then device capacity and spectrum reuse are improved, but signal interference and decoding complexity increase
Solution Approach 1:
The patent segments the received signal into two distinct components: the nominal OFDM service signal and the underlay non-orthogonal signal. The receiver separately processes each signal type using appropriate decoding methods for their respective modulation schemes, managing complexity through functional segmentation rather than attempting to decode all signals uniformly.
Solution Approach 2:
The patent introduces an intermediary processing stage that handles the separation and initial decoding of underlay signals before final signal reconstruction. This intermediary layer manages the complexity of non-orthogonal decoding by providing a dedicated processing path that bridges the reception of mixed signals and the final data extraction.
3Adaptability or versatility
If non-orthogonal modulation is used for underlay services, then resource utilization and coverage are improved, but signal separation and reliable decoding become more difficult
Solution Approach 1:
The patent applies different quality standards and processing methods to different signal components. The nominal OFDM service receives high-priority processing with stringent decoding requirements, while the underlay non-orthogonal signals are processed with appropriate algorithms matched to their specific modulation characteristics, allowing each signal type to be decoded with optimal reliability for its intended service level.
Data Source
AI summary
Wireless communication devices are adapted to facilitate non-orthogonal underlay transmissions. In one example, devices can receive a wireless transmission on a particular time and frequency resource including a first signal from a first wireless device and a second signal from a second wireless device. The first signal may utilize a first type of modulation for orthogonal wireless communication, and the second signal may utilize a second type of modulation non-orthogonal to the first type of modulation. The wireless communication device can decode the first and second signals. In another example, devices may transmit a first signal utilizing a first type of modulation over a time and frequency resource scheduled for a second signal from a second wireless communication device, the second signal utilizing a second type of modulation for orthogonal wireless communication, where the first type of modulation is non-orthogonal with the second type of modulation. Other aspects, embodiments, and features are also included.