Patent ID: 7822130

Claim:
An apparatus including a vector signal analyzer for testing a plurality of simultaneous orthogonal frequency division multiplexed (OFDM) signals, comprising: signal transformation means for transforming a composite data signal, received via a signal communication path and containing a plurality of simultaneous OFDM signals, to provide a plurality of transformed data signals, wherein said composite data signal originates from a remote signal source having a plurality of signal transmission processes associated therewith and includes a plurality of simultaneous data packets each of which originates substantially concurrently from a respective one of said plurality of signal transmission processes and includes a respective portion of a plurality of preamble data and a respective portion of a plurality of transmit data, each said respective portion of said plurality of transmit data corresponds to a respective portion of a plurality of known data in relation to a respective one of said plurality of signal transmission processes and said signal communication path, and each of said plurality of transformed data signals includes a respective portion of said plurality of simultaneous data packets; and signal processing means for receiving and processing said plurality of known data, at least said respective portion of said plurality of preamble data and at least said respective portion of said plurality of transmit data to provide a plurality of test data indicative of an error vector magnitude (EVM) associated with said composite data signal.