An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) with a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and a plurality of remote stations. Each remote station (RS) has an RS-spread
An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) with a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and a plurality of remote stations. Each remote station (RS) has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The improvement includes the steps of transmitting from the BS-spread-spectrum transmitter, a broadcast common-synchronization channel. The broadcast common-synchronization channel has a common chip-sequence signal common to the plurality of remote stations, and a frame-timing signal. The improvement includes receiving at a first RS-spread-spectrum receiver the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, and transmitting from a first RS-spread-spectrum transmitter an access-burst signal. The access-burst signal has a plurality of segments, which have a plurality of power levels. At the BS-spread-spectrum receiver the access-burst signal is received at a detected-power level. In response to receiving the access-burst signal, the BS-spread-spectrum transmitter transmits to the first RS-spread-spectrum receiver an acknowledgment signal. The first RS-spread-spectrum receiver receives the acknowledgment signal, and in response to receiving the acknowledgment signal, the first RS-spread-spectrum transmitter transmits to the BS-spread-spectrum receiver, a spread-spectrum signal having data.
대표청구항▼
An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) with a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and a plurality of remote stations. Each remote station (RS) has an RS-spread
An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) with a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver, and a plurality of remote stations. Each remote station (RS) has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The improvement includes the steps of transmitting from the BS-spread-spectrum transmitter, a broadcast common-synchronization channel. The broadcast common-synchronization channel has a common chip-sequence signal common to the plurality of remote stations, and a frame-timing signal. The improvement includes receiving at a first RS-spread-spectrum receiver the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, and transmitting from a first RS-spread-spectrum transmitter an access-burst signal. The access-burst signal has a plurality of segments, which have a plurality of power levels. At the BS-spread-spectrum receiver the access-burst signal is received at a detected-power level. In response to receiving the access-burst signal, the BS-spread-spectrum transmitter transmits to the first RS-spread-spectrum receiver an acknowledgment signal. The first RS-spread-spectrum receiver receives the acknowledgment signal, and in response to receiving the acknowledgment signal, the first RS-spread-spectrum transmitter transmits to the BS-spread-spectrum receiver, a spread-spectrum signal having data. " IEEE Journal of Quantum Electronics, 29(6): 1736-1742 (Jun. 1993). Tsang, D.Z., et al., "Switching of Low-Threshold Buried-Heterostructure Diode Lasers at 10 GHz," Appl. Phys. Lett., 45(3): 204-206 (Aug. 1, 1984). Aoki, M., et al., "High-Speed (10 Gbit/s) and Low-Drive-Voltage (1V Peak to Peak) InGaAs/InGaAsP MQW Electroabsorption-Modulator Integrated DFB Laser With Semi-Insulating Buried Heterostructure," Electronics Letters, 28(12): 1157-1158 (Jun. 4, 1992). Kamierski, C., et al., "1.5 μm DFB Lasers with new Current Induced Gain Gratings," France-Telecom CNET-Paris, 1994. Lammert, R.M., et al., "MQW DBR Lasers with Monolithically Integrated External Cavity Electroabsorption Modulators Fabricated Without Modification of the Active Region," Photonics Technology Letters, Manuscript No. 5041, (Dec. 16, 1996). Lu, H., et al., "High Performance AlGaInAs/InP Strained MQW Lasers for Optical Communication," Presentation at Conference Proceedings, LEOS '96, 9thAnnual Meeting, Boston, Massachusetts. Nov. 1996. Stegmuller, B., et al., "Quantum Well Structures for the Integration Laser/Modulator With an Identical Acitve Layer," Photonics Department of ZT, Siemens AG, Munich, Germany. No date given. Alcatel, Alcatel 1916 LMM 12800 ps/nm WDM 2.5 Gbit/s Digital Laser Module, 1-2. May 1999. Tsang, D.Z. et al., "IVB-7 Continuous Multi-Gigahertz Modulation of Q-Switched GaInAsP Diode Lasers," IEEE Transactions on Electron Devices,30(11)1596-1597 (Nov. 1983). . 6. The near-field optical apparatus of claim 5, wherein said first emission facet is positioned opposite said optical medium and separated from said optical medium by a distance d such that d<λ. 7. The near-field optical apparatus of claim 6, wherein said first emission facet is positioned opposite said optical medium and separated from said optical medium by a distance d such that d
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