OFDM Wideband Interference Measurement With Reduced ADC Sampling
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring wideband interference on orthogonal frequency division multiplexing (OFDM) channels due to difficulties in predicting waveform types and parameters of interfering signals, especially when using analog receivers and frequency modulated continuous waveform (FMCW)-based receivers.
Innovation Solution
A UE transmits capability parameters for wideband interference measurement, allowing a network node to configure a wideband interference measurement resource, enabling the UE to measure interference using an analog or FMCW-based receiver, regardless of the interfering signal's waveform type, by reporting supported bandwidth, ADC sampling rate, and measurement granularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wideband interference measurement methods are used in OFDM channels, then measurement coverage can be achieved, but measurement accuracy deteriorates due to difficulty in predicting waveform types and parameters of interfering signals
Solution Approach 1:
The patent changes the fundamental measurement parameter from waveform-specific characteristics to FMCW signal characteristics. By converting the measurement approach to rely on frequency modulation characteristics rather than OFDM waveform parameters, the system achieves accurate interference measurement across different waveform types without needing to predict interfering signal parameters.
Solution Approach 2:
The patent substitutes the traditional digital signal processing approach with FMCW-based measurement methodology. This replacement enables the system to measure interference in a manner that is independent of the interfering signal's waveform type, thereby improving both accuracy and adaptability simultaneously.
2Measurement precision
If high ADC sampling rates are used for wideband interference measurement, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent changes the sampling rate parameter from high values to lower values by utilizing FMCW measurement techniques. This parameter change allows accurate interference measurement to be achieved with reduced ADC sampling rates, thereby lowering power consumption while maintaining measurement precision.
3Use of energy by moving object
If subband-based interference measurement is used, then power consumption is reduced, but measurement precision deteriorates for wideband channels
Solution Approach 1:
The patent substitutes the subband-based measurement mechanism with FMCW-based wideband measurement. This substitution enables the system to achieve accurate wideband interference measurement without dividing the bandwidth into multiple subbands, thereby maintaining measurement precision while keeping power consumption low through reduced ADC sampling requirements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network node, a capability report indicating one or more capability parameters that are associated with wideband interference measurement of an orthogonal frequency division multiplexing (OFDM) channel and a supported subband size for the OFDM channel. The UE may receive, from the network node, configuration information indicating an interference measurement resource associated with a set of frequency domain resources, wherein the set of frequency domain resources includes a greater number of frequency domain resources than the supported subband size. The UE may measure, based on the reception of the configuration information, the interference measurement resource to obtain interference measurement information associated with the OFDM channel. The UE may transmit, to the network node, a measurement report indicating the interference measurement information. Numerous other aspects are described.