Relay Network Transmitter Interference Cancellation
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Solution Overview
Problem
Conventional MIMO systems face performance degradation due to interference between transmitter antennas, especially when the number of receiver antennas is less than the number of transmitter antennas, leading to reduced spectral efficiency and system performance, particularly at high frequencies above 5 GHz.
Innovation Solution
A relay transmission scheme is implemented, using a receiver with equalizers and a regenerator to identify and remove interference signal components from transmitter antennas, and a transmitter with a relay network controller to manage data transmission and beamforming, ensuring independent channel characteristics and improved signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmitter antennas is increased to improve spectral efficiency, then data transmission capacity increases, but interference between transmitter antennas worsens when receiver antennas are fewer
Solution Approach 1:
The receiver extracts and removes interference signal components from the received signal. The interference cancellation unit specifically extracts interference caused by other transmitter antennas and subtracts it from the total received signal, allowing the desired signal to be detected without contamination from simultaneous transmissions.
Solution Approach 2:
The patent introduces an interference cancellation unit as an intermediary component between the receiver antennas and the data detection unit. This intermediary processes the received signal by removing interference components before the actual data detection occurs, enabling accurate detection even with multiple transmitter antennas.
2Productivity
If spatial multiplexing is used to transmit multiple data streams simultaneously, then spectral efficiency improves, but signal detection accuracy deteriorates due to interference
Solution Approach 1:
The received signal is segmented into desired signal components and interference components. The interference cancellation unit separates these components and removes only the interference portion, preserving the integrity of the desired signal while eliminating contamination from other transmitter antennas.
Solution Approach 2:
The patent converts the harmful interference from simultaneous transmissions into a detectable and removable component. By identifying and subtracting the interference signal, the system transforms the harmful effect of multiple simultaneous transmissions into a manageable parameter that can be eliminated, thereby enabling accurate detection.
3Device complexity
If the number of receiver antennas is reduced to simplify system structure, then device complexity decreases, but the ability to distinguish transmitter antennas and ensure independent channel characteristics deteriorates
Solution Approach 1:
The interference cancellation unit acts as an intermediary that compensates for the reduced number of receiver antennas. By actively removing interference signals, it provides the functional equivalent of having more receiver antennas, allowing the system to distinguish between transmitter antennas and maintain independent channel characteristics even with fewer physical receiver antennas.
Data Source
AI summary
An apparatus and method are provided for transmitting high-speed data through a plurality of transmitter antennas using a relay network, receiving signals transmitted from the plurality of transmitter antennas, and removing interference in a mobile communication system. The received signals are despread on a transmitter antenna-by-transmitter antenna basis according to a preset spreading factor. The despread signals are divided into data signals and noise. The signals transmitted through the plurality of transmitter antennas are regenerated from recovered data signals. Data components and interference signal components are identified. The interference signal components are removed from the signals transmitted on the transmitter antenna-by-transmitter antenna basis.