Millimeter-Wave Reference Signaling for Single-Carrier User Multiplexing
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Solution Overview
Problem
In millimeter wave wireless communication systems, multiplexing of users is difficult due to high path loss and signal attenuation, and existing multi-carrier transmission technologies are inefficient, leading to challenges in channel estimation and supporting multiple users.
Innovation Solution
A method and device for transmitting reference signals using a single carrier, adjusting waveform, symbol number, and sequence based on the radio environment, allowing for effective channel estimation and multiplexing of users without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-carrier transmission technology is used in millimeter wave systems, then data transmission capacity can be increased, but channel estimation performance deteriorates due to high path loss and signal attenuation
Solution Approach 1:
The patent changes the fundamental transmission parameter from multi-carrier to single-carrier waveform, which fundamentally alters the signal structure to have lower peak-to-average power ratio (PAPR). This parameter change enables better signal penetration in millimeter wave bands while maintaining adequate channel estimation performance through proper reference signal design.
Solution Approach 2:
The patent segments the transmission signal into single-carrier waveform with properly positioned reference signals embedded within the data symbols. This segmentation allows the reference signals to be clearly distinguishable from data symbols, enabling accurate channel estimation even in high path loss conditions characteristic of millimeter wave systems.
2Measurement precision
If single carrier transmission is used to improve channel estimation, then channel estimation performance is enhanced, but user multiplexing capability is reduced
Solution Approach 1:
The patent resolves the multiplexing limitation by introducing frequency domain resource allocation as an additional dimension. Multiple users are multiplexed by assigning different frequency resources (subcarriers) to different users, while each user still benefits from single-carrier transmission properties. This dimensional expansion maintains the advantages of single-carrier for channel estimation while enabling multi-user support.
Solution Approach 2:
The single-carrier transmission scheme is designed to be universal and can be applied to multiple users through proper resource allocation. The reference signal design is configured adaptively for each user based on their allocated resources, making the single-carrier approach universally applicable across multiple users rather than limited to single-user scenarios.
3Productivity
If reference signals are transmitted with data symbols in single carrier mode, then resource efficiency is improved, but signal interference increases
Solution Approach 1:
The patent applies preliminary action by performing precise positioning of reference signals within the single-carrier waveform structure before data transmission. Reference signals are placed at predetermined positions that are optimized to minimize interference with data symbols while maximizing channel estimation accuracy. This pre-planned arrangement prevents interference issues rather than attempting to resolve them after transmission.
Solution Approach 2:
The patent introduces proper orthogonal frequency division multiplexing (OFDM) modulation as an intermediary process that transforms the single-carrier signal into a form where reference signals and data symbols can coexist with minimal interference. The OFDM modulation acts as a mediator that maintains the low PAPR benefits of single-carrier while enabling clean separation between reference signals and data through the orthogonal nature of OFDM subcarriers.
Data Source
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AI summary
The disclosure relates to a method and device for communication between a base station (BS) and a user equipment (UE) in a millimeter wave wireless communication system. An operating method of a BS in a wireless communication system according to an embodiment may include: transmitting, via higher layer signaling, one or more reference signal configurations to a UE so as to transmit a reference signal by using a single carrier; transmitting, to the UE, information about a reference signal configuration to be used for the UE from among the one or more reference signal configurations, via at least one of the higher layer signaling, a physical downlink control channel (PDCCH), or a media access control control element (MAC CE); and transmitting, to the UE, the reference signal via a data channel, based on the information about the reference signal configuration to be used for the UE.