Channel Estimation and Peak-to-Average Power Ratio Analysis of Narrowband Internet of Things Uplink Systems

Table 1

Physical channels and signals for NB-IoT systems.

Channels/Signals		Functions
Downlink	Narrowband Physical Downlink Control Channel (NPDCCH)	Scheduling information for both downlink and uplink data channels
	Narrowband Physical Downlink Shared Channel (NPDSCH)	Downlink dedicated and common data
	Narrowband Physical Broadcast Channel (NPBCH)	Master information for system access
	Narrowband Synchronization Signal (NPSS/NSSS)	Cell search including time and frequency synchronization and cell identity detection
Uplink	Narrowband Physical Uplink Shared Channel (NPUSCH)	Uplink dedicated data and control information
	Narrowband Physical Random Access Channel(NPRACH)	Random access procedure
	Narrowband Demodulation Reference Signal(NDMRS)	Uplink channel estimation