Interference Alignment in Wireless Transceiver Networks
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Solution Overview
Problem
In wireless communication networks, interference from multiple transmitters sharing the same carrier frequency leads to reduced data rates due to inter-cell interference, and existing solutions often underutilize bandwidth by conservatively allocating radio resources.
Innovation Solution
The method involves transceiver units autonomously selecting precoding weights for antennas, allowing multiple transmitters to send data simultaneously on the same resources by aligning interference signals into a low-dimensional subspace, and using broadcast messages to determine a network timing source for synchronization.
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 converts inter-cell interference from a harmful factor into a beneficial one by using interference alignment techniques. Multiple transmitters intentionally transmit on the same resources, and the interference is aligned into a low-dimensional subspace that can be easily separated from the desired signal at the receiver, thereby improving bandwidth utilization without sacrificing data rates
Solution Approach 2:
The patent changes the parameters of signal transmission by using precoding weights to transform the interference structure. By adjusting the precoding matrices at transmitters, the interference signals are transformed into a predictable pattern that occupies a reduced signal space, allowing receivers to extract desired signals effectively even in the presence of interference
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 avoiding interference through conservative resource allocation, the patent embraces interference by allowing multiple transmitters to share resources simultaneously. The interference is then managed through alignment techniques that convert the harmful overlapping transmissions into a structured pattern that can be separated at the receiver, achieving both interference management and high bandwidth utilization
3Object-affected harmful factors
If centralized channel information exchange is implemented, then interference management is improved, but system complexity increases
Solution Approach 1:
The patent implements a distributed approach where each transmitter autonomously selects precoding weights based on local channel conditions without requiring centralized coordination. Each node independently manages its own interference contribution, eliminating the need for complex centralized information exchange while still achieving effective interference alignment through autonomous decision-making
Data Source
AI summary
Systems, methods, and computer readable media for communication in a network having a plurality of transceiver units are provided. The method can include transmitting by each transceiver unit (TU), a first broadcast message including a unique identifier of a respective TU and a network timing source identifier indicating the unique identifier of a TU upon which the respective TU relies for network time. The method can include receiving at the plurality of TUs, the first broadcast messages from one or more of the plurality of TUs. The method can include selecting, by each TU, a network timing source from among the plurality of TUs based on the unique identifiers and the network timing source identifiers. The network timing source can serve as the timing source for communications within the network.