Spatial Multiplexing via Twisted Pairs for Signal Fading
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Solution Overview
Problem
Wireless communication with mobile devices is adversely affected by signal fading, multi-path, and electromagnetic wave propagation through walls, necessitating improved methods and systems to enhance reception.
Innovation Solution
The method involves converting spatial multiplexing streams into intermediary frequency signals and transmitting them over multiple conductors to create macro-diversity by shifting signals into a single wireless frequency range for transmission over antennas, utilizing multi-conductor cables like category 5 cables, and combining signals at different spatial locations to achieve improved reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication uses traditional single-path transmission, then device complexity is low, but signal reception is degraded due to fading and multi-path interference
Solution Approach 1:
The transmission system is segmented into multiple independent signal paths (first plurality of output signals and second plurality of output signals) that are transmitted simultaneously over different conductors to different locations. Each path experiences independent fading, allowing the receiver to combine them and overcome signal degradation through diversity reception.
Solution Approach 2:
The patent transitions from single-path transmission to multi-path transmission by adding a spatial dimension. Multiple conductors are used to transmit signals to different locations (first location and second location), creating spatial diversity. This dimensional expansion allows the system to exploit multiple propagation paths to improve reception reliability.
2Reliability
If multiple conductors are used to transmit signals to different locations, then macro-diversity is achieved and reception is improved, but the system complexity increases
Solution Approach 1:
The multi-conductor cables serve multiple functions: they transmit spatial multiplexed signals to different locations, enable macro-diversity reception, and can be integrated with existing infrastructure (e.g., using category 5 cables for both data and wireless backhaul). This multi-functionality reduces the need for separate dedicated transmission media.
Solution Approach 2:
The patent transmits multiple copies of the same signal (or signal components) over different conductors to different locations. These copies are then combined at the receiver through macro-diversity reception. The copying approach allows the system to create redundant signal paths that can compensate for fading and interference on any single path.
3Productivity
If spatial multiplexing is implemented with multiple streams, then data transmission rate increases, but interference between streams and signal fading affect reception
Solution Approach 1:
The spatial multiplexed streams are segmented and distributed across different conductors and locations. The first plurality of output signals and second plurality of output signals are transmitted over separate conductors to different locations, isolating the streams spatially. This segmentation reduces interference between streams while maintaining high data rates through spatial multiplexing.
Solution Approach 2:
The patent converts the harmful effect of signal fading into a beneficial diversity reception mechanism. By transmitting signals through multiple paths (first location and second location) using different conductors, the system creates multiple signal copies that experience independent fading. The receiver combines these diverse signals to overcome fading effects, turning the harmful fading phenomenon into a useful diversity advantage.
Data Source
AI summary
A system operative to replicate an exact frequency match among multiple signals associated with spatial multiplexing. The system includes twisted pairs and a converter configured to receive multiple input signals, in which each of the input signals is an orthogonal frequency division multiplexing signal comprising multiple sub-carriers, and in which input signals are associated respectively with multiple streams generated in conjunction with spatial multiplexing. The converter utilizes a reference signal, associated with an original conversion signal(s) used outside the converter to establish respective frequency ranges associated with the input signals, to reproduce the original conversion signal(s) as respective replica conversion signal(s). The replica conversion signal(s) are used to respectively convert the input signals into output signals all occupying a same single frequency range such that the sub-carriers of each output signal exactly match in frequency, thus enabling wireless transmission and successful decoding of output signals in conjunction with spatial multiplexing.