Methods for transmitting and receiving a broadcast signal comprising a pilot signal and an information signal
A method for transmitting and receiving a broadcast signal by an access network to a plurality of terminals of a two-way wireless communication system. An information signal is formed from the broadcast information destined for the terminals. A pilot signal is formed and a broadcast signal including the information signal SI 1 and the pilot signal is transmitted. The information signal and the pilot signal are transmitted on different respective central frequencies having a predefined frequency gap.
1. A method for transmitting a broadcast signal, using an access network, to a plurality of terminals of a bidirectional wireless communication system, comprising steps of:
forming an information signal SI 1 from broadcast information destined for said plurality of terminals;
forming a pilot signal SP;
transmitting a broadcast signal comprising the information signal SI 1 and the pilot signal SP, the information signal SI 1 and the pilot signal SP are transmitted on different respective center frequencies having a predetermined frequency gap ΔF 1 ;
transmitting another information signal SI 2 on a center frequency having a predetermined frequency gap ΔF 2 with respect to the center frequency of the pilot signal SP, the predetermined frequency gap ΔF 2 being different from the predetermined frequency gap ΔF 1 ; and
wherein the respective center frequencies of the pilot signal SP and of each information signal vary over time, each frequency gap between the center frequency of the pilot signal SP and the center frequency of said each information signal is constant over time.
2. The method as claimed in claim 1 , wherein the information signal SI 2 is formed from the same broadcast information as that of the information signal SI 1 .
3. The method as claimed in claim 1 , wherein the information signal SI 2 is formed from broadcast information different from that of the information signal SI 1 .
4. The method as claimed in claim 1 , wherein the information signal SI 1 and the information signal SI 2 are formed according to different respective physical layer protocols.
5. The method as claimed in claim 4 , wherein the information signal SI 1 and the information signal SI 2 are formed according to different modulations.
6. The method as claimed in claim 1 , wherein the pilot signal SP is a sinusoidal signal.
7. The method as claimed in claim 1 , wherein the predetermined frequency gap ΔF 1 is less than 10 kilohertz.
8. The method as claimed in claim 7 , wherein the predetermined frequency gap ΔF 1 is less than 1 kilohertz.
9. The method as claimed in claim 1 , wherein the information signal SI 1 is an ultra-narrowband.
10. A base station to transmit a broadcast signal to a plurality of terminals of a bidirectional wireless communication system, comprising:
a processor configured to form an information signal SI 1 from broadcast information destined for said plurality of terminals, and a pilot signal SP;
a wireless transmitter configured to transmit a broadcast signal comprising the information signal SI 1 and the pilot signal SP, the information signal SI 1 and the pilot signal SP are transmitted on different respective center frequencies having a predetermined frequency gap ΔF 1 ;
a wireless transmitter configured to transmit another information signal SI 2 on a center frequency having a predetermined frequency gap ΔF 2 with respect to the center frequency of the pilot signal SP, the predetermined frequency gap ΔF 2 being different from the predetermined frequency gap ΔF 1 ; and
wherein the respective center frequencies of the pilot signal SP and of each information signal vary over time, each frequency gap between the center frequency of the pilot signal SP and the center frequency of said each information signal is constant over time.
11. An access network to transmit a broadcast signal to a plurality of terminals of a bidirectional wireless communication system, comprising:
a base station comprising a processor configured to form an information signal SI 1 from broadcast information destined for said plurality of terminals and to form a pilot signal SP;
a wireless transmitter configured to transmit a broadcast signal comprising the information signal SI 1 and the pilot signal SP, the information signal SI 1 and the pilot signal SP are transmitted on different respective center frequencies having a predetermined frequency gap ΔF 1 ;
a wireless transmitter configured to transmit another information signal SI 2 on a center frequency having a predetermined frequency gap ΔF 2 with respect to the center frequency of the pilot signal SP, the predetermined frequency gap ΔF 2 being different from the predetermined frequency gap ΔF 1 ; and
wherein the respective center frequencies of the pilot signal SP and of each information signal vary over time, each frequency gap between the center frequency of the pilot signal SP and the center frequency of said each information signal is constant over time.