Optical-Domain MIMO Precoding for Inter-Cell Interference Reduction
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Solution Overview
Problem
Existing wireless MIMO systems face inter-cell interference and high computational complexity, with proposed solutions like coordinated MIMO and dark fiber technology being costly.
Innovation Solution
A method involving precoding optical signals in the optical domain to generate MIMO signals, considering channel state information from both transmission channels, reduces inter-cell interference and increases signal-to-noise ratio, using a precoder matrix derived from concatenated channel matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordinated MIMO is implemented at base stations to reduce inter-cell interference, then signal-to-noise ratio is improved, but computational complexity and cost increase
Solution Approach 1:
The patent replaces the traditional base station-based coordinated MIMO system with an optical-domain precoding system. Instead of performing complex signal processing at base stations, the invention uses optical signals to carry precoded data directly from a centralized unit, eliminating the need for computationally intensive operations at distributed base station locations while maintaining interference reduction benefits.
Solution Approach 2:
The patent introduces optical signals as an intermediary medium between the centralized precoding unit and base stations. The optical domain serves as a mediator that transmits precoded information without requiring the base stations to perform complex computations, thereby reducing device complexity while preserving the signal quality improvement.
2Reliability
If coordinated MIMO is implemented to reduce inter-cell interference, then signal-to-noise ratio is improved, but system cost increases
Solution Approach 1:
The patent substitutes expensive base station-based coordinated MIMO implementations with a more cost-effective optical-domain approach. By moving the precoding function to a centralized unit and using optical signals for transmission, the system reduces the computational and hardware costs at individual base stations while achieving the same interference reduction effect.
3Object-affected harmful factors
If traditional MIMO systems are used, then base station hardware design is simple, but inter-cell interference is high
Solution Approach 1:
The patent introduces optical signals as an intermediary that enables coordinated MIMO functionality without complicating base station hardware. The optical domain acts as a bridge that carries precoded information, allowing base stations to receive pre-processed signals rather than performing complex processing themselves, thus reducing local hardware complexity while eliminating inter-cell interference.
Data Source
AI summary
A method of transmitting precoded signals can include precoding an optical signal to produce a precoded optical signal, transmitting a precoded optical signal over an optical portion of a first transmission channel, converting the precoded optical signal to a first MIMO signal, transmitting the first MIMO signal over a wireless portion of the first transmission channel, transmitting the precoded optical signal over an optical portion of a second transmission channel, converting the precoded optical signal to a second MIMO signal; transmitting the second MIMO signal over a wireless portion of the second transmission channel; wherein the precoding takes account of both first channel state information associated with the first transmission channel and second channel state information associated with the second transmission channel.