Method of and arrangement for synchronizing the receiver arrangements in a digital multiplex transmission system
First Claim
1. In a digital multiplex transmission system comprising a base radio station having a transmitter and a plurality of mobile radio stations each having a receiver, channels for transmission of data symbols (d1 . . . dn) from the transmitter to the respective receivers being established by employing different code distributions of such data symbols in respective channels, such data symbols being transmitted in time-synchronism with each other;
- a method of synchronizing the base station transmitter with the mobile station receivers, comprising;
insertion of respective synchronizing symbols (S1 . . . Sn) between successive data symbols transmitted in each of said channels, the synchronizing symbols in all channels being identical and the synchronizing symbols in each channel all being spaced at the same time intervals; and
simultaneously transmitting the speech symbols in a plurality of said channels.
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Abstract
A digital multiplex radio transmission system wherein transmission channels between a fixed radio station and a plurality of mobile radio stations may be established by code division multiplex or frequency division multiplex, individual message channels being separated by means of different distributions of the data symbols transmitted therein. In order to synchronize the fixed station transmitter with the mobile station receivers, respective synchronizing symbols are inserted between the successive data symbols transmitted in any channel. The synchronizing symbols used in all channels are the same, and are spaced at the same time intervals in each channel. Consequently, they are received with significantly higher energy than the data symbols, permitting the multi-path profile to be measured and providing reliable synchronization.
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Citations
9 Claims
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1. In a digital multiplex transmission system comprising a base radio station having a transmitter and a plurality of mobile radio stations each having a receiver, channels for transmission of data symbols (d1 . . . dn) from the transmitter to the respective receivers being established by employing different code distributions of such data symbols in respective channels, such data symbols being transmitted in time-synchronism with each other;
- a method of synchronizing the base station transmitter with the mobile station receivers, comprising;
insertion of respective synchronizing symbols (S1 . . . Sn) between successive data symbols transmitted in each of said channels, the synchronizing symbols in all channels being identical and the synchronizing symbols in each channel all being spaced at the same time intervals; and
simultaneously transmitting the speech symbols in a plurality of said channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a method of synchronizing the base station transmitter with the mobile station receivers, comprising;
Specification