TH42194A - The search and tracking of channels for radio communication systems. - Google Patents

Abstract

DC60 (12/01/43) In a radio communication system with physical channels, where each channel consists of at least one logic channel, this invention proposes the transmission of both the search and synchronization tracking paths and the positioned system information to the user station on a single logic channel designated as the "sync" channel. For this purpose, the synchronization channel carries the repeated search term (1) along with the system information (2). During the repetition of the search term, the system information is designated to be propagated before being transmitted on the synchronization channel. This invention makes it possible to limit the amount of system resources that can be dedicated to providing the synchronization function and the propagation of the system information. In a radio communication system with physical channels, where each channel consists of at least one logic channel, this invention proposes the transmission of both the search and synchronization tracking paths and the positioned system information to the user station on a single logic channel designated as the "sync" channel. For this purpose, the synchronization channel carries The search term is repeated (1) along with the system information (2). During the repetition of the search term, the system information is set to be propagated before being transmitted over the synchronization channel. This invention makes it possible to limit the amount of system resources that are dedicated to providing the synchronization function and the propagation of the system information.

Claims (9)

1. A telecommunication system consisting of one transmitting station and at least one user station communicating with each other via radio signals. The system includes transmission pathways for the periodic transmission of system information over at least one logical channel relative to the physical channel, and for the transmission of search terms during such periodic transmission of system information and over the logical channel, enabling user stations to locate the physical channel relative to that logical channel. The system is characterized by the system information being transmitted using base M modulation with Hada Mard code before transmission, enabling user stations to better track the phase and frequency of the physical channel relative to that logical channel. 2. The telecommunications system under claim 1 is characterized by the fact that the search term is arranged in a periodic pattern in a logical channel; the period of such pattern is a multiplication of the period of the frame of that time channel. 3. The telecommunication system under claim 1 is characterized by the fact that the search term shall be repeated periodically, the repetition period being a submultiplication of the period of the period of that time frame. 4. The telecommunication system under claim 1 is characterized by the fact that the search term shall be repeated periodically, the repetition period being a multiple of the period of the frame of that time slot. 5. A telecommunications system under any of the claims in Clauses 1 through 4 is designated as having the characteristic that the information of such system is encrypted and error-corrected before being broadcast. 6. A telecommunication system under any of the claims in Clauses 1 through 5 is characterized that the system shall consist of a number of physical channels, each physical channel consisting of at least one logical channel, and is characterized that at least one of the logical channels shall be used as a synchronization channel. 7. The telecommunications system under claim 6 is characterized by the logical signal channel being defined by coded multiple access. 8. A user station for a telecommunication system under any of the claims in Clauses 1 through 7, which consists of at least one receiver component containing a means for the acquisition and tracking of the phase and frequency of a physical channel consisting of at least one logical channel; a station that is designated to be further demodulated by base M using the Hada Mard code means; and a station that is designated to be performed by base M demodulation in order to obtain information of such broadcasting system and to assist in tracking the phase and frequency of that physical channel. 9. A transmitting station for a telecommunication system under any of the claims in Clauses 1 through 7; a transmitter consisting of a path for the periodic transmission of search terms over a logical channel; a path for the transmission of "system" information over at least one such logical channel; such a transmitter shall be further characterized by base-M modulation using HADAMARD code paths of such system information.