In data communications and networking, orthogonal frequency-division multiplexing OFDM is a method of digital data modulation, whereby a single stream of data is divided into several separate sub-streams for transmission via multiple channels. OFDM uses the principle of frequency division multiplexing FDM , where the available bandwidth is divided into a set of sub-streams having separate frequency bands. OFDM is a specialised FDM having the constraint that the sub-streams in which the main signal is divided, are orthogonal to each other. Orthogonal signals are signals that are perpendicular to each other.
Math Language algorithms are used for spectral "white space" sensing and adaptive LTE DL waveform creation to fill the white space. This example demonstrates Cognitive Radio adaption to varying channel conditions and capacity requirements using Orthogonal frequency-division multiplexing OFDM techniques. By selectively disabling subcarriers, wideband signals can avoid interfering with narrow-band signals, even if they are located in the same main channel. This example illustrates this concept with the new generic OFDM models available in the base SystemVue algorithm library. The signal created is very similar to Long and short pre-emble is also created and multiplexed into the final OFDM spectrum. Search Tips.
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We propose a semi-blind block-by-block channel estimation algorithm for ofdm systems operating in highly frequency and time selective channels. This algorithm, based on the Expectation-Maximization algorithm, performs an iterative maximum a posteriori estimation of the channel. It can incorporate the coded structure of each coded block in a turbo-processing fashion to enhance channel estimation quality. Moreover, it can use the maximum a posteriori training-based channel estimation algorithm for its optimum initialization.