Receiver Antenna Array with Differentiated Reception Characteristics
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Solution Overview
Problem
Conventional MIMO-OFDM systems are limited by the saturation channel capacity, where antennas must be spaced at least half the wavelength to maintain diversity and full rank, restricting the number of antennas that can be used and thus limiting channel capacity.
Innovation Solution
Configuring receiver antennas with different reception characteristics allows for closer spacing, increasing channel capacity by utilizing more antennas to receive OFDM symbols, exceeding the saturation channel capacity by diversifying subchannels and maintaining effective full rank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antennas are spaced at least half the wavelength to maintain diversity and full rank, then channel diversity is improved, but the number of antennas that can be used is limited
Solution Approach 1:
The patent applies local quality by configuring different receiver antennas with different reception characteristics (different gain patterns, polarization, or frequency responses) rather than requiring uniform spacing. This allows each antenna to capture different signal components, maintaining diversity and full rank even when antennas are closely spaced, thereby resolving the contradiction between reliability and quantity.
2Quantity of substance
If antennas are spaced closer than half the wavelength, then more antennas can be used in a given footprint, but channel capacity saturates
Solution Approach 1:
The patent changes the reception characteristics parameter of the antennas (such as polarization, gain pattern, or frequency response) to differentiate closely spaced antennas. This parameter change allows the system to maintain full rank and increase channel capacity beyond the saturation point, enabling more antennas to contribute effectively to the channel capacity in a given footprint.
3Device complexity
If all receiver antennas present the same reception characteristics, then system complexity is reduced, but channel capacity is limited to saturation
Solution Approach 1:
The patent implements local quality by assigning different reception characteristics to different receiver antennas. This differentiation creates diverse signal paths and maintains full rank, thereby increasing channel capacity beyond saturation while managing complexity through systematic configuration of these characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a higher channel capacity than conventional systems by allowing more antennas in a given footprint, enhancing diversity and signal processing capabilities.
Implementation Method 1
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
Data Source
AI summary
An embodiment of a receiver includes a first number of antennas and a signal analyzer. 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 signal analyzer is configured to recover information from a second number of signals each received by at least one of the antennas over a respective one of a third number of signal pipes, and each having a wavelength that is greater than twice the distance, the second number being related to the third number. Such a receiver can be a multiple-input-multiple-output orthogonal-frequency-division-multiplexing (OFDM-MIMO) receiver that can be configured to increase the information-carrying capacity of a channel (i.e., increase the channel capacity) above and beyond a saturation capacity of the channel.