Example of spectral phase functions include the case where " ? " ( " ? " ) is a constant, in which case the pulse is called a bandwidth-limited pulse, or where " ? " ( " ? " ) is a quadratic function, in which case the pulse is called a chirped pulse because of the presence of an instantaneous frequency sweep.
22.
The 802.11 committee also found that although the instantaneous frequency of a microwave oven magnetron varies widely over each half AC cycle with the instantaneous supply voltage, at any instant it is relatively 802.11a / g signal is inherently robust against such interference because it uses OFDM with error correction information interleaved across the carriers; as long as only a few carriers are wiped out by strong narrow band interference, the information in them can be regenerated by the error correcting code from the carriers that do get through.
