Multiple Antenna Repeater MIMO Signal Processing
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Solution Overview
Problem
Current repeater solutions are not ideal for LTE environments using orthogonal frequency division multiplexing on the downlink, as they fail to effectively support multiple-input-multiple-output (MIMO) communications, leading to a loss of diversity and limited signal-to-interference plus noise ratio (SINR) for user equipment (UE) at the cell edges.
Innovation Solution
A multiple antenna repeater is designed to receive signals using RF isolation schemes and amplify and delay them using combination schemes, allowing for effective transmission with at least two receive and transmit antennas, enabling MIMO communications by applying complex-valued scaling factors and adjusting delays to maintain signal integrity and diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional repeater is used in LTE environments with OFDMA downlink, then basic signal amplification can be achieved, but MIMO communications cannot be effectively supported and diversity is lost
Solution Approach 1:
The repeater system is segmented into multiple independent antenna paths, where each antenna receives and processes signals separately. This segmentation enables the system to maintain multiple signal paths necessary for MIMO operations while preserving signal integrity through individual path processing.
Solution Approach 2:
The invention transitions from a single-antenna architecture to a multi-antenna spatial dimension, adding spatial diversity to the system. By incorporating multiple receive and transmit antennas with independent processing chains, the system gains the dimensional capability required for MIMO communications.
2Reliability
If multiple antennas are deployed for MIMO support, then diversity and SINR can be improved, but device complexity increases
Solution Approach 1:
The patent merges multiple antenna processing functions into a unified repeater architecture that handles multiple input and output signals simultaneously. By combining the processing chains and sharing common components where possible, the system achieves MIMO capability while managing complexity through functional integration.
Solution Approach 2:
The repeater is designed with universal processing capabilities that can handle multiple antenna inputs and outputs through a common processing framework. This multi-functional design allows the same processing logic to be applied across all antenna paths, reducing overall system complexity despite the increased number of components.
Data Source
AI summary
Systems and methodologies are described that enable serving cell selection in a wireless network with a multiple antenna repeater operable to support MIMO communications. In one example, a repeater using orthogonal frequency division multiplexing on the downlink can be equipped to receive, by one or more receive antennas, one or more signals using one or more radio frequency (RF) isolation schemes. The repeater can further be equipped to amplify and delay the one or more signals using one or more combination schemes. Moreover, the repeater can be equipped to transmit, by one or more transmit antennas, the amplified and delayed one or more signals, wherein at least one of the one or more receive antennas or the one or more transmit antennas includes two or more antennas.