Complex Signal Compression Using Polar Phase Quantization
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Solution Overview
Problem
Current methods for compressing complex digital signals in cloud wireless access networks do not achieve a sufficient compression ratio without degrading signal quality, especially with the increasing transmission rates due to MIMO or multiple bands.
Innovation Solution
A method that converts complex digital signals into polar coordinates, separating them into two phases, which are then quantized to improve compression efficiency, allowing for a higher compression ratio without degrading signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compression is performed on complex digital signals using conventional methods (individual compression of real and imaginary components), then compression is achieved, but the compression ratio is insufficient for high transmission rates
Solution Approach 1:
The patent transforms the complex digital signal from rectangular coordinates (real and imaginary components) to polar coordinates (amplitude and phase), changing the parameter representation to enable more efficient compression while maintaining signal quality
Solution Approach 2:
The patent transitions from two-dimensional rectangular coordinate representation to polar coordinate representation, utilizing a different dimensional framework to achieve better compression performance
2Productivity
If transmission rate is increased due to MIMO or multiple bands, then communication capacity is improved, but the required transmission bandwidth increases
Solution Approach 1:
By changing the coordinate system representation of the signal parameters, the patent enables more efficient encoding that reduces the bandwidth required for transmitting high-rate signals in MIMO and multi-band systems
Data Source
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AI summary
An object of the present invention is to provide the compression device and the expansion device of a complex digital signal, which further raise the compression ratio of the compression digital signal. The compression device of the present invention comprises: first section that acquires a first phase and a second phase, wherein with a complex digital signal being inputted into the complex digital signal compression device, the first phase is a phase, in polar coordinates, which the complex digital signal has, and it is assumed that the complex digital signal inputted into the complex digital signal compression device is expressed as a sum of two complex digital signals with an equal amplitude, phases of which are centered at the first phase and are shifted by a phase that equals to the second phase in the positive and negative direction respectively; and second section that compresses the first phase and the second phase respectively by performing quantization. The expansion device of the present invention comprises third section and fourth section which perform the inverse processing of the second section and the first section, respectively, mentioned above.