Contents
What type of modulation is OFDM?
Orthogonal Frequency Division Multiplexing
Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme that extends the concept of single subcarrier modulation by using multiple subcarriers within the same single channel.
Is OFDM a modulation technique?
Orthogonal frequency division multiplexing (OFDM) is a modulation technique that is used in several applications ranging from cellular systems (3GLTE, WiMAX), wireless local area networks (LANs), digital audio radio, underwater communications, and even optical light modulation.
What is the purpose of PSS in 5G?
5G-NR Primary Synchronization Signal (PSS) is Physical Layer specific signal and help UE to get Radio Frame Boundary. It is type of an m-Sequence which is a special type of LFSR (Linear Feedback Shift Register) sequence provides the longest non-repeating sequence.
How is OFDM implemented in 802.11a WLAN modulation?
This topic discusses the basic concepts of OFDM and how OFDM is implemented in 802.11a WLAN modulation. The basic OFDM principles will be introduced using a simple analog OFDM implementation and then those concepts will be extended to the digital domain with a simple digital OFDM implementation which utilizes the FFT
How are the subcarriers of an OFDM signal orthogonal?
The subcarriers are orthogonal to each other, and 3. A guard interval is added to each symbol to minimize the channel delay spread and intersymbol interference. The following figure illustrates the main concepts of an OFDM signal and the inter-relationship between the frequency and time domains.
How often is a new OFDM signal sent?
An OFDM signal extends over a ईම. second long time-interval, which is referred to as the OFDM signal (or symbol) interval. In practice, a new OFDM signal is sent every ईම. second, and the value of ईම. depends on the application, e.g., ईම=Յ ms, or smaller.
How are parallel frequency channels used in OFDM?
OFDM is based on the well-known technique of Frequency Division Multiplexing (FDM). In FDM different streams of information are mapped onto separate parallel frequency channels. Each FDM channel is separated from the others by a frequency guard band to reduce interference between adjacent channels.