Swept frequency modulation and demodulation technique

Pulse or digital communications – Equalizers

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375204, 375230, 375232, 375334, 375340, 370280, 370294, 370330, 370337, 370347, 370436, 370442, 370458, 370478, 370498, H03H 730, H03H 740, H03K 5159, H04B 1500

Patent

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060470232

ABSTRACT:
A swept frequency communication system includes a modulator that multiplies a frequency sweep signal with one or more underlying modulated communication signals to produce a swept frequency signal having a number of headerless tracks located directly adjacent one another in the swept frequency/time domain. A demodulator receives the swept frequency signal after that signal has been passed through a wireless channel, isolates a particular track of the received swept frequency signal to prevent a near/far problem, A/D converts the isolated track, resweeps the digitized isolated track, and then equalizes the isolated track using a blind channel equalizer to eliminate time-varying amplitude/phase impairments caused by transmission of that track through the wireless channel. The demodulator then removes the sweep signal from the equalized swept frequency track and decodes or demodulates the underlying modulated communication signal.

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Chelouche et al., "Digital Wireless Broadband Corporate and Private Networks: RNET Concepts and Applications," IEEE Communications Magazine, Jan. 1997, pp. 42-46, 51.

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