5G Receiver Signal Processing Complexity Reduction
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Solution Overview
Problem
In 5G wireless communication systems, the complexity of receivers is increased due to processing techniques aimed at reducing peak-to-average power ratio (PAPR), which necessitates a solution to simplify signal processing without compromising performance.
Innovation Solution
A reception device and method that apply cyclic shifts to symbol values based on designated modulation schemes, such as π/2 BPSK, to generate second and third values, thereby reducing the complexity of signal processing and obtaining data from received signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If processing techniques are applied to reduce peak-to-average power ratio (PAPR), then signal quality is improved, but receiver complexity increases
Solution Approach 1:
The patent segments the signal processing operation by separating the circular shift operation from the full WLMMSE receiver processing. Instead of implementing the complete WLMMSE receiver with complexity O(L^3), the invention applies circular shifts to divide and simplify the processing into manageable operations that reduce complexity while maintaining signal quality.
Solution Approach 2:
The patent changes the processing parameters by applying circular shifts of specific amounts (e.g., L/4 samples) to the received signal. This parameter transformation converts the complex signal into a form that can be processed with simpler operations, reducing receiver complexity from O(L^3) to O(L log L) while preserving the essential signal characteristics needed for reliable communication.
2Measurement precision
If widely linear minimum mean square error (WLMMSE) receiver processing is applied, then signal processing performance is optimized, but computational complexity increases from L^3 to L log L
Solution Approach 1:
Instead of applying the full WLMMSE receiver processing directly to the received signal, the invention inverts the approach by first applying circular shifts to simplify the signal structure, then performing reduced-complexity processing. This inversion of the processing sequence achieves the desired performance with lower computational complexity.
Solution Approach 2:
The patent uses circular shifts to create transformed copies of the received signal that preserve essential information while enabling simpler processing. By working with these transformed copies rather than the original signal directly, the system achieves WLMMSE-like performance with reduced computational complexity from O(L^3) to O(L log L).
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method of a reception device in a wireless environment according to various embodiments of the present disclosure may include receiving a signal from a transmission device, identifying that the received signal is modulated based on at least one designated modulation scheme of modulation schemes, based on identifying, generating second values by applying a first circular shift of a first direction to first values relating to first symbols of the signal, and generating third values by applying a second circular shift of a second direction which is different from the first direction, to complex conjugate values of the first values, generating second symbols of the signal based at least in part on the second values and the third values, and obtaining data about the signal based at least in part on the second symbols.