RF Repeater Signal Mapping for Uplink MIMO Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing Multiple Input Multiple Output (MIMO) performance, particularly for uplink signals, due to limitations in antenna configuration and signal processing, which affect signal quality and diversity gain.
Innovation Solution
A transmission apparatus and method that utilize a plurality of reception antennas to receive uplink signals, an RF repeater to amplify and map these signals to a fewer number of transmission antennas, with selection and processing based on signal quality and channel states to optimize transmission, including combining or distributing signals to compensate for channel differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reception antennas are used to receive uplink signals, then signal quality and diversity gain are improved, but device complexity increases
Solution Approach 1:
The patent extracts and processes only the necessary number of signals (M signals) from the multiple received signals, mapping them to fewer transmission antennas (N antennas where N < number of reception antennas). This selective extraction approach maintains signal quality while reducing the complexity of the transmission antenna configuration.
Solution Approach 2:
The RF repeater acts as an intermediary device that receives signals from multiple reception antennas, processes them through amplification and mapping, and transmits to fewer transmission antennas. This intermediary processing stage enables the system to achieve diversity gain from multiple reception antennas while maintaining a simpler transmission antenna configuration.
2Reliability
If multiple transmission antennas are used to transmit uplink signals, then MIMO performance is improved, but device complexity increases
Solution Approach 1:
The system extracts M received signals from multiple reception antennas and maps them to N transmission antennas where N is less than the number of reception antennas. This selective mapping maintains MIMO performance by preserving the essential signal diversity while reducing the number of transmission antennas required, thereby lowering device complexity.
Solution Approach 2:
The patent changes the parameter relationship between reception and transmission antennas, specifically setting the number of transmission antennas (N) to be less than the number of reception antennas. This parameter change enables the system to achieve good MIMO performance with an asymmetric antenna configuration, reducing overall system complexity.
3Loss of information
If all received signals are mapped to transmission antennas, then signal completeness is improved, but processing complexity increases
Solution Approach 1:
The RF repeater extracts only the M most important or highest quality received signals from the plurality of received signals and maps these M signals to N transmission antennas. This selective extraction approach maintains signal completeness for the most critical signals while reducing processing complexity by not handling all received signals equally.
Solution Approach 2:
The system performs partial action by mapping only M signals (where M is less than or equal to the number of reception antennas) to the transmission antennas, rather than mapping all received signals. This partial processing approach maintains the essential signal information while reducing the complexity of signal processing and antenna mapping operations.
Data Source
AI summary
A method and apparatus for transmitting an uplink signal in a wireless communication system are disclosed. A transmission apparatus for receiving an uplink (UL) signal from a user equipment (UE) and transmitting the received UL signal to a base station (BS) in a wireless communication system includes: a plurality of reception antennas configured to receive UL signals from the UE; a radio frequency (RF) repeater configured to amplify and map the received UL signals to at least one transmission antenna; and a plurality of transmission antennas configured to transmit the amplified UL signals to the BS, wherein the RF repeater is configured to select M received UL signals from among a plurality of received UL signals which are received in the plurality of reception antennas, and map the M received UL signals to N transmission antennas from among the plurality of transmission antennas, and the number of the reception antennas (Nrx,REP) is higher than the number of the transmission antennas (Ntx,REP), and N is the number of the transmission antennas which is used to transmit the M received UL signals.