Reception Device Signal Segmentation for ISI Reduction
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Solution Overview
Problem
In multi-carrier systems, the increased calculation required for demodulating signals and removing multi-code interference in MC-CDM systems leads to higher computational burdens, particularly due to inter symbol interference (ISI) and inter carrier interference (ICI) caused by delay waves exceeding guard intervals.
Innovation Solution
A reception device and method that generates a replica signal to remove arrival waves based on received signal power, dividing the signal into time periods to reduce ISI and ICI, and performs demodulation on combined signals, thereby decreasing computational load and improving signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delay waves over guard interval are present in multi-carrier transmission, then signal reception is performed, but inter symbol interference (ISI) and inter carrier interference (ICI) occur causing characteristics depletion
Solution Approach 1:
The received signal is divided into multiple time periods based on received power levels. High-power time periods and low-power time periods are processed separately, with different demodulation strategies applied to each segment to optimize performance while managing computational load.
Solution Approach 2:
Arrival waves are extracted and removed from the received signal before FFT processing. By identifying and eliminating the harmful delay wave components that cause ISI and ICI, the remaining signal can be processed with reduced interference.
2Object-affected harmful factors
If replica signal method is used to remove arrival waves, then inter symbol interference and inter carrier interference are reduced, but calculation amount increases
Solution Approach 1:
Instead of processing the entire received signal uniformly, only specific time periods with high received power are processed using the computationally intensive replica signal method. Low-power time periods are handled with simpler processing, reducing overall calculation while maintaining performance where it matters most.
Solution Approach 2:
The processing approach changes based on the received power parameter. When received power is high, full replica signal processing is applied. When received power is low, simplified processing is used. This adaptive parameter-based approach optimizes the balance between interference removal and computational complexity.
3Productivity
If received signal is divided into time periods based on received power, then processing efficiency is improved, but system complexity increases
Solution Approach 1:
The received signal timeline is segmented into distinct time periods based on power thresholds. This segmentation enables parallel or sequential processing of different segments with appropriate algorithms, improving overall processing efficiency while keeping individual segment processing manageable.
Solution Approach 2:
The system dynamically adjusts processing based on real-time received power measurements. Time periods are classified as high-power or low-power based on instantaneous power levels, and processing strategies are adapted accordingly. This dynamic approach improves efficiency without requiring complex fixed-structure designs.
Data Source
AI summary
A reception device includes a replica signal generating unit which generates a replica signal which is a replica of a transmitted signal based on a received signal, a time period setting unit which sets a plurality of time periods which time period of the received signal is divided into based on a received power of the received signal, an arrival wave removing unit which removes an arrival waves from the received signal for each time period set by the time period setting unit using the replica signal generated by the replica signal generating unit, a combining unit which combines the signals that the arrival waves are removed by the arrival wave removing unit from the received signal for each time periods set by the time period setting unit; and a demodulation processing unit which performs a demodulation process for the signal combined by the combining unit.