Master unit, remote unit and multiband transmission system

Abstract

A master unit and a remote unit is provided for a multiband transmission system for distributing and combining signals of at least one wireless communication network and at least one digital network. A reference frequency generator is arranged in the master unit, the reference frequency generator being designed to clock a master modem for converting the signals of the at least one digital network. The reference frequency signal emitted by the reference frequency signal is restored via a reference frequency receiver and is used for closing a remote modem that is located there for demodulation.

What is claimed is: 
     
         1 . A master unit, comprising:
 a master downlink interface for receiving a data signal to be wirelessly transmitted;   a master modem for converting the data signal into a coded digital data signal;   a reference frequency generator for generating a reference frequency signal, wherein the master unit is configured for combining the coded digital data signal with the reference frequency signal to form a combined coded digital signal; and   a master transmission unit for transmitting the combined coded digital signal on a wired transport link.   
     
     
         2 . The master unit according to  claim 1 , wherein the combined coded digital signal includes a digitized radio frequency signal from a base transceiver station. 
     
     
         3 . The master unit according to  claim 1 , wherein the data signal is associated with one of a radio frequency communications network and a wired digital communications network. 
     
     
         4 . The master unit according to  claim 1 , wherein the reference frequency signal is usable for modem clocking the master modem. 
     
     
         5 . The master unit according to  claim 1 , wherein the reference frequency generator is configured to concomitantly provide the reference frequency signal for combining with the coded digital data signal and to the master transmission unit as an uncombined reference frequency signal. 
     
     
         6 . The master unit according to  claim 1 , further comprising a spread sequence generator connected downstream of the reference frequency generator and being configured to spread the data signal. 
     
     
         7 . The master unit according to  claim 1 , further comprising a spread sequence generator connected downstream of the reference frequency generator and being configured to spread the reference frequency signal. 
     
     
         8 . The master unit according to  claim 1 , wherein the master transmission unit is configured to transmit digital baseband data on the combined coded digital signal. 
     
     
         9 . The master unit according to  claim 1 , wherein the master modem is configured for a QAM or an FSK modulation/demodulation. 
     
     
         10 . The master unit according to  claim 1 , further comprising a master uplink interface for receiving a combined uplink signal from a remote unit and for communicating with a base station of at least one wireless communication network. 
     
     
         11 . The master unit according to  claim 1 , further comprising a master uplink splitter for splitting an uplink coded digital signal from the combined coded digital signal. 
     
     
         12 . A remote unit, comprising:
 a remote downlink interface for receiving a combined coded digital signal from a master unit via a wired transport link, the combined coded digital signal including a downlink coded digital data signal and a reference frequency signal;   a remote modem for converting the downlink coded digital data signal into a downlink data signal; and   a remote downlink interface for transmitting the downlink data signal to a network terminal of a wireless communication network.   
     
     
         13 . The remote unit according to  claim 12 , further comprising:
 a remote uplink interface for receiving an uplink data signal from the network terminal of the wireless communication network, wherein the remote modem is configured to convert the uplink data signal into an uplink coded digital data signal; and   a remote transmission unit for transmitting the uplink coded digital data signal.   
     
     
         14 . The remote unit according to  claim 12 , wherein the reference frequency signal is usable for clocking the remote modem using the reference frequency signal for modulating and demodulating data signals. 
     
     
         15 . A method, comprising:
 receiving a data signal for being wirelessly transmitted;   generating a reference frequency signal; and   transmitting a combined signal on a wired transport link, the combined signal included an coded digital data signal and the reference frequency single, the coded digital data signal being formed from the data signal.   
     
     
         16 . The method according to  claim 15 , wherein receiving a data signal includes receiving a digital downlink data signal from a base station associated with one of a radio frequency communications network or a wired digital communications network. 
     
     
         17 . The method according to  claim 15 , further comprising spreading at least one of the data signal or the reference frequency signal. 
     
     
         18 . The method according to  claim 15 , wherein the master transmission unit is configured to transmit digital baseband data that is included in the combined coded digital signal. 
     
     
         19 . The method according to  claim 15 , further comprising converting the data signal into the coded digital data signal. 
     
     
         20 . The method according to  claim 15 , further comprising using the reference frequency signal to clock a modem in converting the data signal into the coded digital data signal.