A technique for transmitting a spread spectrum signal using plural
non-contiguous frequency bands separated by segments of frequency
spectrum excluded from use involves: generating a digital time-domain
spread spectrum signal; converting the time-domain signal to a
frequency-domain signal via an FFT; excising a portion of the
frequency-domain signal by selectively removing frequency bins of the
frequency-domain signal to cause spectral nulling of the transmit signal
at the frequencies of the excluded segments; and converting the excised
frequency-domain signal to an excised time-domain signal via an inverse
FFT, which is then converted to an analog signal for transmission. The
non-contiguous spectrum selection technique is implemented in a
transmitter that transmits data communication signals or navigation
signals, and permits use of plural, non-contiguous frequency bands to
transmit a wide bandwidth signals that cannot be transmitted in a
continuous frequency band due to constrains in the allocated frequency
spectrum available for transmission.