초록 ▼

An OCDMA spread spectrum communication system is provided with a PN encoded acquisition channel signal which is free of Radamacher functions. This provides a technique for very rapid acquisition of the PN code and data symbol timing; enables accurate PN chip time tracking with a minimum of power; en

An OCDMA spread spectrum communication system is provided with a PN encoded acquisition channel signal which is free of Radamacher functions. This provides a technique for very rapid acquisition of the PN code and data symbol timing; enables accurate PN chip time tracking with a minimum of power; enables accurate frequency tracking with a minimum of power; provides a technique for accurate signal power measurement at the receiver; enables the receiver to maintain code lock during deep fades; and penetrates into areas of high attenuation for paging or to alert user that he has a call waiting.

대표청구항 ▼

[ What is claimed is:] [3.] In a spread spectrum communication system in which a set of orthogonal Radamacher-Walsh (RW) functions are overlaid with a pseudo-noise (PN) sequence and an information signal to form an orthogonal code division multiple access (OCDMA) transmit signal, each orthogonal fun

[ What is claimed is:] [3.] In a spread spectrum communication system in which a set of orthogonal Radamacher-Walsh (RW) functions are overlaid with a pseudo-noise (PN) sequence and an information signal to form an orthogonal code division multiple access (OCDMA) transmit signal, each orthogonal function of said set carries voice or data for a single user in said system, a source of RF carrier, and means to phase modulate said OCDMA transmit signal onto said RF carrier, the improvement comprising:means to provide a time division multiplex (TDM) acquisition signal comprised of a carrier burst modulated by a short PN code which is free of all orthogonal Radamacher-Walsh (RW) functions and multiplexer means for combining said TDM acquisition signal with said OCDMA transmit signal for phase modulation on said RF carrier.