Beamspace Nonlinear Equalization for Multi-Channel Spur Reduction
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Solution Overview
Problem
Conventional nonlinear equalization techniques require substantial I/O and real-time processing due to the need for post-distortion filters in each individual channel, especially in systems with hundreds or thousands of channels, which increases circuit complexity and power consumption.
Innovation Solution
The system employs a beamspace nonlinear equalization architecture that decimates digital input signals into parallel channels, applies finite impulse response filters, phase shifts, and sums the outputs to produce polyphase signals, which are then serialized and equalized using a single nonlinear equalizer, reducing the need for individual channel processing and leveraging channel averaging to compensate for non-linearities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional nonlinear equalization is applied to each individual channel, then spur reduction is achieved, but device complexity and power consumption increase substantially
Solution Approach 1:
The patent merges the nonlinear equalization function from individual channel level to beam level. Instead of implementing separate post-distortion filters for each of the N channels, a single nonlinear equalizer processes the combined beam signal, achieving the same spur reduction effect while dramatically reducing device complexity and power consumption.
Solution Approach 2:
The single nonlinear equalizer in the beam path serves the function of equalizing all N channels simultaneously. This universal approach replaces multiple specialized per-channel equalizers, maintaining effective spur reduction across all channels while simplifying the overall system architecture.
2Reliability
If conventional nonlinear equalization is applied to each individual channel, then distortion error correction is improved, but power consumption increases substantially
Solution Approach 1:
The patent combines the power consumption of N separate nonlinear equalizers into a single nonlinear equalizer processing the beam signal. This merging reduces total power consumption while maintaining the distortion error correction capability through the unified equalization of the combined signal from all channels.
3Reliability
If post-distortion filters are implemented in each channel, then nonlinear distortion is compensated, but I/O requirements increase substantially
Solution Approach 1:
The patent merges the I/O requirements of N separate post-distortion filters into a single nonlinear equalizer in the beam path. This consolidation reduces the number of I/O connections and data paths needed while maintaining effective nonlinear distortion compensation through centralized beam-level processing.
Data Source
AI summary
System and method for beamspace nonlinear equalization in a plurality of parallel channels includes: receiving M parallel signals for transmission by N channels, respectively, wherein M is an integer greater than or equal to 1 and N is an integer greater than 1; performing a linear transfer function on each of the M parallel signal by a finite impulse response (FIR) filter; adding FIR filter tap outputs to each M parallel signals, respectively; phase shifting an output of a respective FIR filter per each of the M parallel signals to generate M intermediate channelized output signals per each of the N channels; summing, by a single summer, the M intermediate channelized output signals across the N channels to produce M channelized polyphase output signals; serializing the M channelized polyphase output signals to generate serialized M polyphase output signals; and equalizing the serialized M polyphase output signals to produce a linearized signal in beamspace.