Autonomous Precoding Weight Selection for Interference Alignment
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Solution Overview
Problem
In communication systems, interference arises when multiple transmitters share the same carrier frequency, leading to inter-cell interference that reduces data rates and necessitates conservative resource allocation, resulting in underutilized bandwidth.
Innovation Solution
The implementation of interference alignment (IA) using autonomous selection of precoding weights for antennas, allowing multiple transmitters to send data simultaneously on the same resources by aligning interfering signals into a reduced dimensional subspace, thereby canceling interference and optimizing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitters share the same carrier frequency, then bandwidth utilization is improved, but inter-cell interference increases reducing data rates
Solution Approach 1:
The patent applies interference alignment by transforming the interference problem from the time-frequency domain into the spatial domain using multiple antennas. Transmitters use precoding weights to project interfering signals into a reduced-dimensional subspace, while desired signals are transmitted in the orthogonal complement. This dimensional transformation allows simultaneous transmissions on the same frequency without interference, resolving the contradiction between bandwidth utilization and interference reduction.
Solution Approach 2:
The patent introduces precoding weights as an intermediary mechanism that mediates between multiple transmitters sharing the same frequency resource. These weights act as a coordination layer that aligns interfering signals into a specific subspace, enabling the system to achieve both high bandwidth utilization and interference-free communication by coordinating transmissions across the spatial dimension.
2Object-affected harmful factors
If conservative resource allocation is used to avoid interference, then interference is reduced, but bandwidth is under-utilized
Solution Approach 1:
Instead of conservatively allocating frequency resources in the time-frequency domain, the patent exploits the spatial dimension through multiple antennas. By using precoding to separate desired and interfering signals in space, the system can aggressively allocate frequency resources without increasing interference, thereby achieving both low interference and high bandwidth utilization simultaneously.
Solution Approach 2:
The patent performs preliminary alignment of interfering signals through precoding before transmissions occur. By pre-calculating precoding weights that align interfering signals into a specific subspace, the system proactively eliminates interference before it affects data transmission, enabling full bandwidth utilization without compromising signal quality.
3Productivity
If multiple transmitters send data simultaneously on the same resources, then throughput is improved, but interference alignment complexity increases
Solution Approach 1:
The patent segments the signal space into two orthogonal subspaces: one for desired signals and one for interfering signals. By using precoding weights to project interfering signals into a lower-dimensional subspace, the system reduces the complexity of interference management while enabling multiple simultaneous transmissions, thus achieving high throughput without proportionally increasing alignment complexity.
Data Source
AI summary
A system and method for data communication are presented. The method can include generating a set of precoding weights by autonomously selecting a precoding weight for each antenna at the first transceiver. The method can include transmitting a set of selected precoding weights in a request message. The method can include receiving an indication that the second transceiver unit will accept a transmission from the first transceiver unit. In response to the receiving, the method can include precoding data as precoded data using the set of precoding weights and transmitting the precoded data to the second transceiver unit using antennas of the one or more antennas corresponding to the set of precoding weights.