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How do you calculate nominal bandwidth?
Determining the Nominal Bandwidth If the Nominal Bandwidth of the signal is not known, use the Spectrum trace data to determine an approximate value. In this example the spectrum is approximately 5.5 gradicules wide and each gradicule is 1.25 MHz wide. This makes the approximate bandwidth 5.5 x 1.25 = 6.875 MHz.
How do you calculate subcarriers?
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 …
How is the duration of an OFDM symbol calculated?
The OFDM symbol duration is a basic parameter for data rate computations (see below). In OFDM PHY, one OFDM symbol represents 192 subcarriers, each transmitting a modulation data symbol (see above). One can then compute the number of data transmitted for the duration of an OFDM symbol (which value is already known).
How to calculate bandwidth require for OFDM signal processing?
You can use only a few OFDM subcarriers to form OFDM signal of wishful bandwidth like it works in OFDMA systems. For example you have 1024 available subcarriers and use only 64 of them. So your bandwidth (I mean the bandwidth you occupy in radio spectrum) is obviously less than sample rate.
What are the parameters of a radio OFDM system?
When I test a simple software defined radio OFDM system with parameters as FFT = 256, data carrier per symbol = 125, number of pilot = 25, bandwidth = 5MHz, carrier frequency = 910MHz, the channel estimation wouks fine. If I change bandwidth to 1MHz, then the channel estimation goes wrong.
How is orthogonal frequency division modulation ( OFDM ) used?
Orthogonal Frequency Division Multiplexing (OFDM) Modulation- a mapping of the information on changes in the carrier phase, frequency or amplitude or combination. Multiplexing- method of sharing a bandwidth with other independent data channels. OFDM is a combination of modulation and multiplexing.