Antenna Array Exceeding Saturation Channel Capacity
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Solution Overview
Problem
Conventional MIMO-OFDM systems are limited by the saturation channel capacity, which restricts the number of antennas that can be used due to minimum spacing requirements, leading to inefficient use of channel diversity and reduced channel capacity.
Innovation Solution
Configuring antennas with different radiation patterns and orientations to allow for closer spacing than the traditional half-wavelength limit, thereby increasing channel capacity by diversifying the communication channel and making it possible to use more antennas within a given footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If antennas are spaced at least half the wavelength apart to avoid saturation channel capacity, then channel capacity is maintained at saturation level, but the number of antennas that can be deployed within a given footprint is limited
Solution Approach 1:
The patent changes the antenna spacing parameter from the conventional half-wavelength minimum to a smaller spacing while simultaneously changing the radiation pattern parameter to achieve super-directional beams. This parameter transformation allows antennas to be packed more densely (increasing quantity per footprint) while maintaining channel capacity above saturation through the use of zero-crossing signal cancellation techniques.
2Quantity of substance
If antennas are spaced closer than half the wavelength, then more antennas can be used within a given footprint, but the channel capacity would normally fall below saturation level
Solution Approach 1:
The patent transforms the radiation pattern parameter to create super-directional beams with specific null orientations. By aligning these nulls with the positions of adjacent antennas, the system cancels out interfering signals at zero-crossing points, thereby maintaining high channel capacity even when antennas are spaced closer than the conventional half-wavelength distance.
Solution Approach 2:
The patent introduces signal processing as an intermediary mechanism that actively manages interference between closely spaced antennas. By detecting and canceling signals at zero-crossing points, the system mediates the interaction between adjacent antennas, allowing them to operate at close spacing without degrading channel capacity below saturation levels.
3Productivity
If all antennas present the same antenna characteristics, then the system operates at saturation channel capacity, but configuring antennas with different characteristics is required to exceed saturation capacity
Solution Approach 1:
The patent applies local quality by configuring each antenna with a specific radiation pattern tailored to its position within the array. Each antenna presents different characteristics (directional gains and nulls) appropriate to its local context, enabling the overall system to achieve channel capacity above saturation while managing complexity through systematic rather than arbitrary configuration.
Data Source
AI summary
An embodiment of a system includes a first number of antennas, a transmitter, and a receiver. The antennas are each spaced from another of the antennas by approximately a distance and are configured to provide, at one or more wavelengths that are greater than twice the distance, a channel capacity that exceeds a saturation channel capacity. The transmitter is configured to generate a second number of signals each having a wavelength that is greater than twice the distance, the second number related to a third number of signal pipes, and to couple each of the second number of signals to a respective one of the antennas. And the receiver is configured to receive from at least one of the antennas a fourth number of signals each having a wavelength that is greater than twice the distance, and to recover information from each of the fourth number of signals, the fourth number being related to the third number.