Multiple Transmit Antennas Spatial Diversity Jamming
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Solution Overview
Problem
Existing communication systems with multiple transmit antennas face challenges in reducing multipath fading, which requires additional processing at the receiver, complicating the system and increasing complexity.
Innovation Solution
A jamming or Managed Access Service (MAS) communication system using multiple transmit antennas with spatial diversity to reduce multipath fading, allowing for signal transmission without additional processing at the receiver, where the signal strength of the transmit signals dominates external signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmit antennas with spatial diversity are used, then multipath fading is reduced, but receiver processing complexity increases
Solution Approach 1:
Instead of adding receiver processing to handle multipath fading, the patent inverts the approach by adding transmit diversity antennas. The transmitter sends multiple signals through different antennas with different phases or polarizations, allowing the receiver to simply combine these signals without complex processing. This resolves the contradiction by moving the complexity from the receiver to the transmitter.
Solution Approach 2:
The patent segments the transmission signal into multiple independent signal paths by using multiple antennas. Each antenna transmits a version of the signal with different characteristics (phase, polarization), and these segmented signals are then combined at the receiver. This segmentation allows simple receiver processing while achieving multipath fading reduction through the diversity of the individual paths.
2Reliability
If additional receiver processing is added to reduce multipath fading, then signal quality improves, but system complexity increases
Solution Approach 1:
The patent inverts the conventional approach by placing the signal processing functionality at the transmitter rather than the receiver. Multiple antennas with different phases or polarizations are used to create diverse signal paths, and the receiver simply combines these pre-processed signals. This eliminates the need for complex receiver processing while maintaining signal quality.
Solution Approach 2:
The patent applies preliminary action by pre-modulating the signals with different phases or polarizations at the transmitter before they are sent through the channel. This preliminary processing of the signal characteristics at the transmit end eliminates the need for subsequent complex processing at the receiver, thereby improving signal quality without increasing system complexity.
3Reliability
If multiple antennas with different polarizations are used, then multipath fading is reduced, but receiver processing requirements increase
Solution Approach 1:
The patent uses multiple antennas with different polarizations at the transmitter and designs the system so that the receiver can simply combine these polarized signals without requiring complex processing. By inverting the conventional approach of adding receiver processing, the patent makes the receiver operationally simple while achieving multipath fading reduction through the polarization diversity at the transmit end.
Solution Approach 2:
The patent applies local quality by assigning different polarization characteristics to different transmit antennas. Each antenna provides a signal with distinct local properties (different polarizations), and these locally differentiated signals are then combined at the receiver. This creates spatial diversity without requiring the receiver to perform complex processing to handle the different polarizations.
4Reliability
If multiple transmit antennas are used with spatial diversity, then signal coverage is improved, but transmitter complexity increases
Solution Approach 1:
The patent segments the transmission function across multiple antennas, where each antenna handles a specific signal path with different phases or polarizations. This segmentation distributes the transmission task and improves signal coverage through spatial diversity, while the modular nature of each antenna's function keeps the overall transmitter complexity manageable.
Solution Approach 2:
The patent designs the multiple transmit antennas to serve multiple functions simultaneously - they can transmit signals with different phases, polarizations, and spatial directions. This multi-functionality allows a single antenna system to provide diverse signal paths for improved coverage, reducing the need for separate specialized components and thereby controlling transmitter complexity.
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
Effectively reduces multipath fading without requiring additional receiver processing, simplifying the system and enhancing performance in environments like prisons or government buildings by ensuring the signal strength of the transmit signals dominates external signals.
Implementation Method 1
at least two transmitters coupled to respective antennas for transmitting the respective transmit signals with spatial diversity
Implementation Method 2
Multipath is caused when a transmitted RF signal takes more than one path to a receive antenna typically based on reflections, such as reflections off the ground or a wall
Data Source
AI summary
A jamming or MAS system is provided having multiple transmit antennas for transmitting respective transmit signals with spatial diversity to reduce multipath fading. The jamming or MAS communication system communicates with at least one receiver for receiving the transmit signals with no additional processing required at the receiver. In some embodiments, the jamming or MAS communication system includes an associated receiver for receiving and analyzing various signals.The jamming or MAS communication system in the present invention is able to help reduce the effects of multipath fading without modifications to the receiver. Prior art attempts to reduce the effects of multipath fading require some form of additional processing at the receiver.The invention is particularly useful when deployed in a Managed Access Service (MAS) system or a jamming system. In particular, such a system can be used in a facility (such as a prison, school, government building, etc) to prevent cellphone usage.