Privacy Modulation Coding for Wireless Device Interference
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Solution Overview
Problem
Managing spectrum resources effectively in wireless communications becomes challenging as the number of electronic devices increases, leading to potential interference between devices intended for different receivers.
Innovation Solution
A method where a transmitting device generates distinct dictionaries for each receiving device, allowing it to modulate and transmit data symbols using a higher modulation order, ensuring privacy by clustering points in the constellation diagrams differently for each receiver, and transmitting a joint symbol using a single resource element, enabling efficient decoding without requiring information from other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitting device transmits different wireless data to different receiving devices using conventional modulation schemes, then spectrum resources are consumed, but wireless data intended for one receiving device may be undesirably exposed to another receiving device and interference occurs
Solution Approach 1:
The patent segments the modulation constellation into multiple dictionaries, where each dictionary is tailored for a specific receiving device's capabilities. The transmitting device generates device-specific dictionaries that partition the signal space, allowing each receiver to decode only its intended data while other data appears as structured noise. This segmentation resolves the privacy contradiction by spatially separating data streams in the constellation domain.
Solution Approach 2:
The patent applies local quality by assigning different modulation characteristics to different regions of the constellation diagram. Each receiving device is assigned a specific region or dictionary with optimized modulation properties matching its capabilities. This allows the system to transmit multiple data streams with different privacy protections and modulation orders simultaneously, resolving the contradiction between reliability and complexity.
2Productivity
If the transmitting device uses a higher modulation order than the receiving devices, then spectral efficiency is improved, but the receiving devices cannot decode the transmitted symbols without additional information
Solution Approach 1:
The patent introduces an additional dimension in the signal space by creating device-specific dictionaries that add a layer of abstraction between the high-order modulation and the receiving devices. Instead of directly transmitting high-order symbols that require complex joint decoding, the system maps data through device-specific dictionaries that transform the high-dimensional signal into lower-dimensional representations tailored to each receiver's capabilities, resolving the contradiction between productivity and ease of operation.
Solution Approach 2:
The device-specific dictionaries act as intermediaries between the high-order modulation scheme and the receiving devices. Each dictionary serves as a private codebook that translates high-dimensional transmitted symbols into lower-dimensional representations that individual receivers can decode independently. This intermediary layer enables high spectral efficiency while maintaining decoding simplicity for each device.
3Productivity
If multiple receiving devices decode from the same transmission, then resource usage is optimized, but interference management becomes difficult
Solution Approach 1:
The patent introduces asymmetry by creating non-symmetric, device-specific dictionaries where the modulation structure for each receiving device is deliberately different from others. This asymmetric design ensures that data intended for one device appears as structured noise to other devices, preventing unintended reception and simplifying interference management. The asymmetric dictionaries allow multiple devices to efficiently share resources while maintaining reliable isolation between data streams.
Data Source
AI summary
A first device may transmit a first symbol for a second device and a second symbol for a third device. The first device may generate a first dictionary and a second dictionary that satisfy a complementary rule. The first device may modulate the first symbol onto an entry from the first dictionary to produce first modulated data and may modulate the second symbol onto an entry from the second dictionary to produce second modulated data. The first device may generate a third symbol as a joint modulation of the first and second modulated data and may transmit the third symbol using a resource element. The second device may decode the third symbol based on the first dictionary to recover the first symbol. The third device may decode the third symbol based on the second dictionary to recover the second symbol. Privacy may be maintained between the second and third devices.