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Digital Signal Processing (DSP) Terminology

dsp signal processing modulation encoding decoding

This page describes terms related to Digital Signal Processing (DSP). It covers concepts like OFDM, OFDMA, FFT, Interpolation, Decimation, Correlation, Convolution, FIR, IIR, Scrambler, Interleaver, Convolution Encoder, Reed Solomon Encoder, etc.

DSP Terms

DSP TermsBasic DescriptionRF Wireless World Reference
OFDMFull form is Orthogonal Frequency Division Multiplexing. It is a multi-carrier system wherein different data symbols are transmitted over multiple carriers densely packed side by side. It helps in increasing the data rate of the system.
OFDMAFull form is Orthogonal Frequency Division Multiple Access. In this technique, resource allocation is done on both time and frequency axis for each user.
FFTThe technique used to convert a time-domain signal to its frequency domain version. It is used for various calculations as well as for representing the signal in its frequency domain view.
InterpolationThe technique used to increase the sampling rate of a signal.
DecimationThe technique used to decrease the sampling rate of a signal.
CorrelationThe technique used to compare two time-domain signals. There are auto and cross-correlations which help explore matching and unmatching parts between the two signals.
ConvolutionThe technique used to filter out a time-domain signal for various applications such as filtering, adding the channel response, etc.
FIRStands for Finite Impulse Response.
IIRStands for Infinite Impulse Response.
ScramblerThe circuit used to remove long strings of ones and zeros. This helps in meeting adjacent channel interference requirements. The main gate is the EX-OR gate used in this circuit.
InterleaverThis is basically a permutation technique which permutes the data such that they will not be contiguously transmitted over the adjacent subcarriers. The adjacent symbols get distributed over the subcarriers. Position of bits which are supposed to get mapped over the modulation symbols is also changed here.
Reed Solomon EncoderIt works in tandem with an RS decoder at the receiver side and a Reed Solomon encoder at the transmitter side. It is a FEC (Forward Error Correction) technique used to correct blocks of errors.
Convolution EncoderIt works in tandem with a Viterbi decoder at the receiver and a Convolution encoder at the transmitter. It is a FEC technique used to correct bits of error.