Frequency-Dependent Residual Sideband Correction via Training Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively correcting frequency-dependent residual side bands, which can lead to interference and reduced communication efficiency, particularly in advanced technologies like 5G and New Radio (NR).
Innovation Solution
The method involves transmitting and receiving frequency-dependent residual side band (FDRSB) training signals on specific sets of subcarriers, both lower and higher than the carrier frequency, with non-overlapping mirrors, to facilitate correction based on these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FDRSB training signals are transmitted on subcarriers closer to the carrier frequency to improve correction accuracy, then measurement precision improves, but harmful interference increases due to overlapping mirror images
Solution Approach 1:
The patent extracts and eliminates the harmful mirror image components by designing a training signal structure where the mirror image of the first set of subcarriers is deliberately placed in a second set of subcarriers that does not overlap with the original first set. This separation extracts the interference-generating component (mirror image) from the useful signal band, allowing accurate FDRSB measurement without harmful interference.
2Productivity
If FDRSB correction is applied to improve signal quality, then communication efficiency improves, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies preliminary action by transmitting FDRSB training signals before actual data transmission to enable advance measurement and correction of frequency-dependent residual side bands. The network node measures FDRSB characteristics using the training signals and provides correction information to the UE in advance, so that the correction can be applied during subsequent data transmission without adding real-time processing complexity.
3Measurement precision
If FDRSB training signals are transmitted frequently to maintain correction accuracy, then measurement precision is maintained, but loss of time increases due to additional signaling overhead
Solution Approach 1:
The patent applies universality by designing the FDRSB training signal to serve multiple functions simultaneously: it enables FDRSB measurement, provides channel estimation capabilities, and supports correction verification. This multi-functionality reduces the need for separate dedicated training signals, thereby maintaining measurement precision while minimizing signaling overhead and time loss.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a frequency dependent residual side band (FDRSB) training signal on a first set of subcarriers that are lower than a carrier frequency and on a second set of subcarriers that are higher than the carrier frequency, a mirror of the first set of subcarriers about the carrier frequency being non-overlapping with the second set of subcarriers. The UE may receive an indication of FDRSB correction that is based at least in part on the FDRSB training signal. Numerous other aspects are described.