How does a subcarrier work?
A subcarrier is a secondary modulated signal frequency modulated into the main frequency (the carrier) to provide an additional channel of transmission. It allows for a single transmission to carry more than one separate signal. Each subcarrier is used to carry additional information.
What is subcarrier in OFDM?
Both OFDM and OFDMA divided a channel into subcarriers through a mathematical function known as an inverse fast Fourier transform (IFFT). The spacing of the subcarriers is orthogonal, so they will not interfere with one another despite the lack of guard bands between them. Each OFDM subcarrier is 312.5 KHz.
How do you calculate subcarrier?
Choosing the first subcarrier to have a frequency such that it has an integer number of cycles in a symbol period, and setting the spacing between adjacent subcarriers (subcarrier bandwidth) to be BSC = B/L, where B is the nominal bandwidth (equal to data rate), and L is the number of subcarriers, ensures that all …
What is subcarrier spacing in LTE?
In addition to this the subcarriers spacing is 15 kHz, i.e. the LTE subcarriers are spaced 15 kHz apart from each other. Each subcarrier is able to carry data at a maximum rate of 15 ksps (kilosymbols per second). This gives a 20 MHz bandwidth system a raw symbol rate of 18 Msps.
What is the meaning of subcarrier?
A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast.
What does DC subcarrier indicate?
3. What does the DC subcarrier indicate? Explanation: All the subcarriers of an OFDM symbol do not carry useful data. In OFDM and OFDMA PHY layers, the DC subcarrier is the subcarrier whose frequency is equal to the RF centre frequency of the transmitting station.
What is meant by subcarrier?
Why are there different subcarrier spacing in 5G?
Wider subcarrier spacing would provide better resistance to such increased Doppler shifts at higher frequency bands. Furthermore, 5G NR provides a flexible solution to support various applications by choosing an appropriate configuration. For example, when higher Δf is used, it results in a shorter slot duration.
What is subcarrier mapping?
Sub-carrier mapping is one of the major considerations for LTE as multiple mobile terminals i.e. users are assigned by partitioned subcarriers in OFDMA system. In LTE uplink a subsets of subcarriers are used to transmit its own data.
What is DC subcarrier?
DC stands for Direct Current and it is a subcarrier that has no information sent on it. The OFDM signal used in LTE comprises a maximum of 2048 different subcarriers with a spacing of 15 kHz. Resource blocks include 12 subcarriers, regardless of the total LTE signal bandwidth. They also cover a slot in the time frame.
What is subcarrier in modulation?
What is subcarrier in 5G?
In 5G NR, subcarrier spacing of 15, 30, 60, 120 and 240 KHz are supported. The numerology (u = 0) represents subcarrier spacing of 15 kHz which is same as LTE. And as you see in the second column the subcarrier spacing other than 15KHz, for 5G NR.
What is subcarrier in radio?
Subcarrier. A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast. There is no physical difference between a carrier and a subcarrier;
What is an example of an unsourced subcarrier?
Unsourced material may be challenged and removed. A subcarrier is a sideband of a radio frequency carrier wave, which is modulated to send additional information. Examples include the provision of colour in a black and white television system or the provision of stereo in a monophonic radio broadcast.
What is the difference between a carrier and a subcarrier?
There is no physical difference between a carrier and a subcarrier; the “sub” implies that it has been derived from a carrier, which has been amplitude modulated by a steady signal and has a constant frequency relation to it.
What is an RDS / RBDS subcarrier?
The RDS / RBDS subcarrier (57 kHz) allows FM radios to display what station they are on, pick another frequency on the same network or with the same format, scroll brief messages like station slogans, news, weather, or traffic—even activate pagers or remote billboards.