code division multiple access system using a network entry channel (NETWORK ENTRY CHANNEL free on rail CDMA SYSTEMS)

摘要

orthogonal code division multiple access (OCDMA) satellite communication system, the base station (GS) selected frequency channel in response to the majority of the users of the national (10 - 1 or 10 - n) from the majority of the spread spectrum signal to a satellite (S) via the subscriber line. the signal from each of the complete orthogonal rw (Rademacher Walsh) function and PN (pseudo noise), ken as the overlay of the data symbol of the subscriber (10, - 1 or 10 - n) from the signal in time and frequency ub3d9uae30uc5d0uc11c base station (GS) in order to achieve synchronization painting.the user station (10 - 1 or 10 - n) the entry channel (NEC) base station (GS) between the signal of the OCDMA history. (null) in the spread spectrum signal is NEC the subscriber station (10 or 10 - n - 1) transmitting function in NEC, signal detection and demodulation. the (10 - 1 or 10 - n) on the frequency and the rw function and the set (10 or 10 - n - 1) in the frequency and time correction signal transmission, the network entry points (10 - 1 or 10 - n) time period is close to the city in the ud55cub2e4.