Receiver Beamforming with Phase Shifting for DMIMO Networks
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively combining signals from multiple transmitters to enhance signal strength and overcome noise, particularly in distributed multiple input multiple output (DMIMO) networks where synchronization and multipath handling become complex.
Innovation Solution
A receiver beamforming technique is employed, which involves receiving wireless transmissions from multiple transmitters at each antenna element, phase-shifting the received antenna signals in relation to multiple beam directions, and combining these phase-shifted signals to synchronize and enhance the received signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitter synchronization is implemented in DMIMO networks to ensure coherent combination of signals, then signal combining effectiveness is improved, but system complexity increases significantly
Solution Approach 1:
The patent inverts the traditional DMIMO approach by moving the beamforming and synchronization functions from the transmitters to the receiver. Instead of multiple transmitters synchronizing their signals coherently, the receiver performs phase-shifting and combining of signals from multiple transmitters that transmit independently. This inversion resolves the contradiction by maintaining signal combining effectiveness while eliminating the complex transmitter synchronization requirements.
Solution Approach 2:
The patent introduces the receiver as an intermediary that performs the coherent combination function. Rather than requiring transmitters to synchronize directly, the receiver acts as a mediator that receives signals from multiple independent transmitters, applies phase-shifting, and combines them coherently. This intermediary approach maintains the benefits of signal combining while avoiding the complexity of transmitter-side synchronization.
2Productivity
If the number of transmitting entities is increased to improve coverage and capacity, then network performance is improved, but synchronization complexity becomes unsurmountable
Solution Approach 1:
The patent applies inversion by shifting the coherent combination burden from multiple transmitters to a single receiver. This allows any number of transmitters to operate independently without synchronization constraints, enabling the network to scale in capacity without increasing synchronization complexity. The receiver handles all the phase-shifting and combining operations regardless of the number of transmitting entities.
3Reliability
If transmitter power is increased to improve received signal strength, then signal quality is improved, but legal limitations and design challenges constrain maximum transmit power
Solution Approach 1:
The patent combines signals from multiple transmitters at the receiver side through coherent beamforming. By phase-shifting and combining signals from multiple sources, the received signal strength is enhanced without requiring any single transmitter to operate at high power levels. This merging approach achieves improved signal quality while respecting legal and design power constraints.
Solution Approach 2:
Instead of increasing transmitter power to improve received signal strength, the patent inverts the approach by using multiple lower-power transmitters whose signals are coherently combined at the receiver. This achieves the same or better signal quality improvement while staying within power constraints, as the gain comes from constructive interference of multiple signals rather than high power transmission.
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 approach allows for coherent combination of signals from different transmission points, thereby increasing the received signal strength and improving the signal-to-noise ratio, even in complex network environments.
Implementation Method 1
phase-shifting, for each antenna element, the received antenna signals in relation to multiple beam directions
Implementation Method 2
combining, for the two or more of the multiple transmitters, the phase-shifted antenna signals thereby providing a received beam signal
Implementation Method 3
synchronizing the received beam signals with regards to a time and/or a phase difference between the received beam signals
Data Source
AI summary
A method for receiver beamforming is provided. The method includes receiving wireless transmissions from multiple transmitters at each of a plurality of antenna elements. The wireless transmissions include a respective identical copy of an information stream. The method further includes phase-shifting, for each antenna element, the received antenna signals in relation to multiple beam directions, thereby providing phase-shifted antenna signals for two or more of the multiple transmitters. The method further includes combining, for the two or more of the multiple transmitters, the phase-shifted antenna signals thereby providing a received beam signals for each of the two or more of the multiple transmitters. The method further includes synchronizing the received beam signals with regards to a time and/or a phase difference between the received beam signals and combining the received beam signals thereby providing a combined receive signal.