MIMO Transceiver Repeater Control for Channel Rank
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Solution Overview
Problem
MIMO channels in cellular communication systems often become rank deficient and experience low signal-to-noise ratio (SNR) in environments with low multipath propagation, such as line-of-sight conditions, limiting their ability to support high data rates and error protection.
Innovation Solution
A transceiver system that controls a repeater to enhance multipath propagation and SNR by activating or deactivating it based on measured performance parameters, and adjusting the amplitude and phase of the forwarded signal to create equally strong singular values, thereby increasing the rank of the MIMO channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology is used to increase data rate and error protection, then system performance is improved, but the system becomes vulnerable to rank deficiency and low SNR in line-of-sight conditions
Solution Approach 1:
A repeater is introduced as an intermediary device between the transmitter and receiver. The repeater receives the signal from the transmitter, processes it, and retransmits it to the receiver, thereby creating additional propagation paths and increasing the channel rank even in line-of-sight conditions where natural multipath is insufficient.
Solution Approach 2:
The system dynamically controls the repeater's operation based on measured performance parameters. The repeater can be activated or deactivated, and its signal processing functions can be adjusted in real-time to optimize the MIMO channel conditions and maintain high channel rank while adapting to changing communication requirements.
2Reliability
If a rich multipath environment is created to increase channel rank, then MIMO performance is improved, but signal attenuation increases due to multiple reflections
Solution Approach 1:
The repeater acts as a controlled intermediary that creates artificial multipath propagation. By strategically positioning the repeater and controlling its signal forwarding, the system generates the necessary multipath effects to increase channel rank without relying on natural reflections that cause excessive signal attenuation.
Solution Approach 2:
The system changes the propagation environment parameters by introducing a controllable repeater node. This allows the creation of multipath propagation with controlled characteristics, where the repeater can adjust signal parameters to achieve the desired channel rank while minimizing energy loss compared to natural multipath environments.
3Reliability
If the repeater is activated to increase channel rank, then multipath propagation is enhanced, but device complexity increases
Solution Approach 1:
The repeater is implemented as a relatively simple intermediary device with standard signal processing capabilities. By using a single repeater node with conventional functions (receive, process, retransmit), the system achieves significant channel rank improvement without introducing excessive complexity that would be required by more complex signal processing systems.
4Reliability
If repeater control is implemented to optimize communication performance, then channel rank and SNR are improved, but control complexity increases
Solution Approach 1:
The system implements feedback control by measuring communication performance parameters and using this information to adjust the repeater's operation. The repeater control is based on feedback from channel conditions, allowing the system to automatically optimize performance without requiring complex manual control or excessive computational overhead for signal processing.
Data Source
AI summary
The invention discloses a transceiver (210, 215; 305, 310, 320, 330) for use in a cellular communications system (200, 300), arranged to communicate with at least one other transceiver in the system by means of technology for Multiple Input Multiple Output, MIMO. The transceiver is also arranged to control the function of a repeater (206, 207, 208, 209; 340) which is arranged to forward communication between the transceiver and said at least one other transceiver, said control being carried out as a result of measured performance parameters of the communication between the transceiver and said at least one other transceiver. In one embodiment, the function in the repeater (206, 207, 208, 209; 340) which the transceiver is arranged to control comprises activation and deactivation of the repeater.