Receive Detection Window Adjustment for Inter-Symbol Interference
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Solution Overview
Problem
In 5G wireless communication systems, particularly in narrow-band service transmission and IoT scenarios, existing Filtered-OFDM (F-OFDM) technologies face challenges due to inter-symbol interference caused by time-domain filtering, which degrades bit error rate (BER) performance and leads to spectrum efficiency losses.
Innovation Solution
A method is introduced where a receiving device determines inter-symbol interference and adjusts the location of the receive detection window based on this estimation, minimizing interference and improving BER performance by sliding the detection window to reduce symbol extension effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If time-domain filtering is applied in F-OFDM to reduce out-of-band emissions, then spectrum efficiency is improved, but inter-symbol interference is introduced which degrades BER performance
Solution Approach 1:
The patent applies preliminary action by estimating the inter-symbol interference before demodulation and proactively adjusting the receive detection window location to compensate for the interference. The receiving device calculates the expected interference pattern based on filter characteristics and channel conditions, then shifts the detection window in advance to avoid the interference region, thereby maintaining both spectrum efficiency and BER performance
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the location of the receive detection window based on estimated inter-symbol interference. The detection window position is modified as a function of filter characteristics, channel impulse response, and interference levels, allowing the system to adapt to varying conditions while maintaining optimal performance
2Device complexity
If the receive detection window location is fixed in conventional F-OFDM, then device complexity is reduced, but inter-symbol interference cannot be mitigated effectively
Solution Approach 1:
The patent applies dynamics by making the receive detection window location adjustable rather than fixed. The window position is dynamically determined based on real-time estimation of inter-symbol interference characteristics, allowing the system to adapt to changing channel conditions and filter configurations while maintaining manageable complexity through algorithmic control
3Reliability
If filtering is performed with longer filter duration to reduce interference, then inter-symbol interference is reduced, but symbol extension effects increase and productivity decreases
Solution Approach 1:
The patent extracts the harmful inter-symbol interference component from the received signal by estimating its characteristics and then adjusts the receive detection window to exclude the interference region. This allows the system to use shorter filters without suffering from severe interference, thereby maintaining transmission efficiency while achieving reliable detection
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 for operating a receiving device in a wireless communication system comprises determining inter-symbol interference between symbols in a received signal, determining a location of a receive detection window according to the inter-symbol interference, and demodulating the received signal based on the location of the receive detection window. A receiving device includes at least one transceiver, and at least one processor configured to determine inter-symbol interference between symbols in a received signal, determine a location of a receive detection window according to the inter-symbol interference, and demodulate the received signal based on the location of the receive detection window. A transmitting device includes at least one processor configured to estimate an equivalent channel frequency response based on characteristic information of a time-domain filter, estimate an inter-symbol interference based on the equivalent channel frequency response, and generate indication information regarding an adjustment of a location of a receive detection window.