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- US5282222 (A)
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Bibliographic data: US5282222 (A) ― 1994-01-25
Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum
| Page bookmark | US5282222 (A) - Method and apparatus for multiple access between transceivers in wireless communications using OFDM spread spectrum | ||||
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| Inventor(s): | FATTOUCHE MICHEL T [CA]; ZAGHLOUL HATIM [CA] + (FATTOUCHE, MICHEL, ; ZAGLOUL, HATIM) | ||||
| Applicant(s): | FATTOUCHE MICHEL [CA]; ZAGLOUL HATIM [CA] + (FATTOUCHE, MICHEL, ; ZAGLOUL, HATIM) | ||||
| Classification: |
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| Application number: | US19920861725 19920331 | ||||
| Priority number(s): | US19920861725 19920331 | ||||
| Also published as: | |||||
Abstract of
US5282222 (A)
|
A method for allowing a number of wireless transceivers to exchange information (data, voice or video) with each other. A first frame of information is multiplexed over a number of wideband frequency bands at a first transceiver, and the information transmitted to a second transceiver. The information is received and processed at the second transceiver. The information is differentially encoded using phase shift keying. In addition, after a pre-selected time interval, the first transceiver may transmit again. During the preselected time interval, the second transceiver may exchange information with another transceiver in a time duplex fashion. The processing of the signal at the second transceiver may include estimating the phase differential of the transmitted signal and pre-distorting the transmitted signal. A transceiver includes an encoder for encoding information, a wideband frequency division multiplexer for multiplexing the information onto wideband frequency voice channels, and a local oscillator for upconverting the multiplexed information. The apparatus may include a processor for applying a Fourier transform to the multiplexed information to bring the information into the time domain for transmission.