Phase Noise Compensation in Wireless AV Reception
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Solution Overview
Problem
In wireless AV systems, high-resolution and high-quality signal transmission is hindered by performance degradation due to phase noise, especially in mmWave communication systems, where existing methods are complex and latency-prone, and unsuitable for parallel operation in multi-receiving antenna environments.
Innovation Solution
A receiving apparatus and method that estimates and compensates for phase noise using a Minimum Mean Square Error (MMSE) weight matrix, decomposes transmission signals for each reception antenna, and performs Inverse Fast Fourier Transform (IFFT) to minimize performance degradation and complexity, enabling parallel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase noise compensation is performed in mmWave wireless communication, then demodulation performance is improved, but system complexity and latency increase
Solution Approach 1:
The patent divides the phase noise compensation process into separate operations for each receiving antenna. Instead of processing all antennas simultaneously with high complexity, the system performs IFFT and phase noise estimation independently for each antenna, enabling parallel processing and reducing overall system complexity while maintaining compensation effectiveness.
Solution Approach 2:
The patent performs preliminary decomposition of the transmission signal for each receiving antenna before performing the IFFT operation. This preliminary segmentation allows the system to prepare data for parallel processing, reducing computational latency and enabling more efficient phase noise compensation without increasing real-time complexity.
2Reliability
If phase noise compensation is performed using conventional methods, then demodulation performance is improved, but processing latency increases
Solution Approach 1:
The patent segments the signal processing into per-antenna operations, allowing the IFFT and phase noise estimation to be performed independently for each receiving antenna. This segmentation enables parallel processing across multiple antennas, significantly reducing the sequential processing time and overall latency compared to conventional single-stream methods.
Solution Approach 2:
The patent transitions from processing signals in a single dimension (sequential per-antenna processing) to a multi-dimensional approach where IFFT and phase noise estimation are performed simultaneously for all antennas. This dimensional change enables parallel processing and reduces processing latency while maintaining demodulation performance.
3Reliability
If conventional phase noise compensation methods are used, then demodulation performance is improved, but parallel operation capability is lost
Solution Approach 1:
The patent explicitly segments the signal processing tasks by receiving antenna, with each antenna having its own independent IFFT and phase noise estimation operations. This segmentation creates naturally parallelizable work units that can be processed simultaneously, enabling the system to leverage multi-core processors and improve overall productivity while maintaining compensation effectiveness.
Solution Approach 2:
The patent performs IFFT and phase noise estimation for each receiving antenna even when not all antennas are actively receiving signals. This excessive action ensures that all antenna paths are prepared and processed in parallel, maximizing the system's parallel processing capability and productivity, with idle antenna results simply being discarded.
Data Source
AI summary
The present specification relates to a reception apparatus and method for demodulating a signal in a wireless AV system. The reception apparatus estimates a transmission signal on the basis of an MMSE weight matrix. The reception apparatus divides the estimated transmission signal for respective reception antennas and performs an IFFT. The reception apparatus estimates and compensates for phase noise for the respective reception antennas on the basis of the signal for which the IFFT has been performed. The reception apparatus demodulates the estimated and compensated signal for respective streams.