OFDMsüsteemides

OFDMsüsteemides is a term that refers to Orthogonal Frequency-Division Multiplexing (OFDM) systems in Finnish. OFDM is a digital modulation technique used in modern wireless communication systems. It divides a high-speed data stream into multiple lower-speed streams that are transmitted simultaneously over a number of closely spaced orthogonal subcarrier frequencies. The orthogonality ensures that the subcarriers do not interfere with each other, even though their spectra overlap. This property makes OFDM spectrally efficient.

The primary advantage of OFDM is its ability to combat frequency-selective fading, a common problem in wireless channels where different frequencies experience different levels of attenuation and distortion. By dividing the data into many narrowband subcarriers, each subcarrier experiences a relatively flat fading characteristic, making it easier to equalize. This also helps to mitigate the effects of inter-symbol interference (ISI).

OFDM is widely employed in various communication standards, including Wi-Fi (IEEE 802.11a/g/n/ac/ax), 4G LTE, 5G NR, digital broadcasting (DVB-T, ATSC), and power-line communications. Its robustness against multipath propagation and its efficient use of bandwidth have made it a cornerstone of modern wireless technology. The implementation of OFDM typically involves Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT) algorithms for modulation and demodulation, respectively, which are computationally efficient.