Beam Space MIMO Baseband Modulation for SINR Compensation
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Solution Overview
Problem
In beam space MIMO systems, the reduction of Signal-to-Interference Plus Noise Ratio (SINR) occurs due to the rotation of Beam Basis patterns, leading to performance reduction, especially when receiving multiple streams, as the ADC sampling frequency changes and the time interval for each Beam Basis pattern is shortened, resulting in a small portion of streams being received simultaneously.
Innovation Solution
A baseband modulation apparatus that includes an antenna array, a baseband unit, a band converter, a load calculator, and a signal changing controller to calculate and set load values for parasitic antenna elements, ensuring phase and magnitude changes are consistent across frequencies, and a signal change unit to adjust the baseband or RF band signals accordingly, maintaining consistent phase and magnitude changes for each frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ADC sampling frequency is increased to receive multiple streams simultaneously, then the productivity is improved, but the time interval for each Beam Basis pattern is shortened causing SINR reduction
Solution Approach 1:
The patent performs preliminary beam basis pattern rotation and signal separation before ADC sampling. By pre-processing the received signal in the analog domain to separate different streams onto different frequency bands, the system can then sample each stream independently at lower rates while maintaining high SINR for each stream, thus achieving multi-stream reception without sacrificing signal quality
Solution Approach 2:
The patent segments the multi-stream signal into separate frequency bands before sampling. Each Beam Basis pattern corresponds to a specific frequency band, allowing the system to process and sample each stream independently. This segmentation enables parallel processing of multiple streams while maintaining adequate sampling time for each individual stream
2Quantity of substance
If the number of Beam Basis patterns is increased to improve MIMO performance, then the quantity of substance is improved, but the ADC sampling frequency must be increased causing time interval reduction and SINR deterioration
Solution Approach 1:
The patent performs preliminary signal separation and frequency band allocation based on Beam Basis patterns before ADC sampling. This allows the system to handle multiple Beam Basis patterns by distributing them across different frequency bands that can be sampled independently, avoiding the need to increase the overall sampling frequency and thus preserving the time interval and SINR for each pattern
3Adaptability or versatility
If beam basis pattern rotation is performed to receive multiple streams, then the adaptability is improved, but phase and magnitude changes occur causing channel estimation errors
Solution Approach 1:
The patent performs preliminary phase and magnitude compensation for each Beam Basis pattern before the signal undergoes rotation and mixing. By pre-calculating and applying compensation factors that account for the expected phase and magnitude changes during beam basis pattern rotation, the system maintains accurate channel estimation even as signals are dynamically routed to different frequency bands for multi-stream reception
Data Source
AI summary
A modulation method of a baseband signal, an apparatus thereof, and a receiving apparatus thereof in a beam space MIMO are disclosed. The baseband signal modulation apparatus may calculate a load value of a plurality of antenna elements by using the baseband signal. Also, the baseband signal modulation apparatus may change the phase or the magnitude for the baseband signal or a first band signal of a higher frequency than the baseband signal by corresponding to the frequency of the baseband signal.