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US Patent 5903609 - Transmission system using transmitter with phase modulator and frequency multiplier
US Patent Issued on May 11, 1999
Estimated Patent Expiration Date:
June 6, 2016Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
June 6, 2016Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA transmission system for transmitting digital symbols by modulation according to a phase constellation includes a transmitter having a phase modulator and a frequency multiplier in cascade for producing a modulated signal having a desired transmission frequency. To prevent degradation of the bit error rate of such signal, the phase constellation at the input of the phase modulator has at least one additional phase state relative to the phase constellation at the output of the frequency multiplier. Advantageously, the number of phase states of the constellation at the input of the phase modulator is N times the number of phase states of the constellation at the output of the frequency multiplier, where N is the frequency multiplication factor. | InventorsApplicationNo. 659385 filed on 06/06/1996US Classes:375/261, Quadrature amplitude modulation332/103, PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR375/298Quadrature amplitude modulationField of Search375/261, Quadrature amplitude modulation375/256, PULSE TRANSMISSION VIA RADIATED BASEBAND375/259, SYSTEMS USING ALTERNATING OR PULSATING CURRENT375/269, With phase or frequency shift keying375/279, Phase shift keying375/273, Combined with phase shift keying375/298, Quadrature amplitude modulation375/283, Differential phase shift keying (diphase)375/300, Amplitude modulation375/308, Phase shift keying332/103, PHASE SHIFT KEYING MODULATOR OR QUADRATURE AMPLITUDE MODULATOR332/108, Plural modulation332/144PHASE MODULATORExaminersPrimary: Chan, JasonAssistant: Corrielus, Jean B. Attorney, Agent or FirmUS Patent References3854094, 4571549, 16-QAM Modulator with PLL amplification devicesIssued on: 02/18/1986 Inventor: Lods , et al.5233628, Computer-based bit error simulation for digital wireless communications Issued on: 08/03/1993 Inventor: Rappaport, et al.5237292, Quadrature amplitude modulation system with compensation for transmission system characteristics Issued on: 08/17/1993 Inventor: Chethik5438592, PI/4-DQPSK phase state encoder/decoder Issued on: 08/01/1995 Inventor: Boccuzzi5438594, Device for demodulating digital signals modulated by an alternating modulation constellation technique Issued on: 08/01/1995 Inventor: Podolak5539588, Magnetic recording/reproducing with added intersymbol interference to obtain a partial-response code Issued on: 07/23/1996 Inventor: Sawaguchi, et al.5633893Digital modulation method with controlled envelope variation Issued on: 05/27/1997 Inventor: Lampe, et al. Foreign Patent References
International ClassesH04L 23//02.5/12 Foreign Application Priority Data1995-06-08 EP |
