Abstract: A circuit for signal classification in a digital pre-distortion (DPD) system is provided. The circuit includes a first frequency path with a positive frequency translation to generate a first power level corresponding to a signal output of the first frequency path, a second frequency path with a negative frequency translation to generate a second power level corresponding to a signal output of the second frequency path, and a third frequency path configured to filter the input signal via a high pass filter (HPF) and to generate a third power level corresponding to a signal output of the third frequency path. The circuit further includes a processing unit configured to compute frequency content metrics corresponding to the input signal based on the first power level, the second power level and the third power level for selecting a set of DPD coefficients for the DPD circuit.

Abstract: A wireless link simulator includes, in sequence, a digital transmit device under test (TX-DUT), a wireless link simulator, and a digital receive device under test (RX-DUT). The wireless link simulator includes, in sequence, a transmitter IQ imbalance generator, a power amplifier non-linearity generator, a noise floor generator, a multi-path channel generator, a receive noise generator, a frequency offset generator, a phase noise generator, a receive IQ imbalance generator, and a DC offset generator. Each of the generators may be individually varied to determine the receiver sensitivity to each of these effects and associated parameters.

Abstract: A integrated system for generation of packet detection, symbol timing, and coarse frequency offset for an orthogonal frequency division multiplexed (OFDM) receiver having a stream of input symbols applied comprises a first multiplier performing a multiplication on a delayed and conjugated stream of input symbols multiplied by the input symbol stream. The output of the first multiplier is summed over a symbol length. A second multiplier has an output formed from multiplying the delayed symbol stream by its conjugate, thereby providing a signal strength term Pn. The output of the second multiplier is summed over two symbol periods, and multiplied by a known threshold to form a threshold value. When the magnitude of cn term rises above the known threshold, this generates a packet detect output, and when the magnitude of Cn terms thereafter falls below the known threshold, this generates a symbol timing output.