Telecommunication system using multiple nyquist zone operations
Telecommunication systems using multiple Nyquist zone operations are provided. In one aspect, a telecommunication system can include a first section and a second section. The first section can receive signals from at least one transmitting base station or transmitting terminal device. The received signals have frequencies in multiple frequency bands. The first section can also sample the received signals such that the received signals are aliased. The first section can also combine the aliased signals from the frequency bands into a combined frequency band in a common Nyquist zone. The second section can extract signals from the combined frequency band. The extracted signals are to be transmitted at frequencies in a frequency band from a Nyquist zone that is different than the common Nyquist zone. The second section can also transmit the extracted signals to at least one receiving base station or receiving terminal device. Other embodiments are disclosed.
1. A telecommunication system comprising:
first circuitry configured to:
receive signals from at least one transmitting base station or at least one transmitting terminal device, the received signals having frequencies in a plurality of frequency bands,
generate, from the received signals, a first set of aliased signals corresponding to signals in a first frequency band and a second set of aliased signals corresponding to signals in a second frequency band, wherein the first circuitry is configured to generate the first set of aliased signals and the second set of aliased signals by sampling the received signals such that the received signals are aliased, and
combine the first set of aliased signals and the second set of aliased signals into a combined frequency band in a common Nyquist zone, wherein the first set of aliased signals and the second set of aliased signals are non-overlapping within the common Nyquist zone; and
wherein signals transmitted to at least one receiving base station or at least one receiving terminal device are derived from signals extracted from the combined frequency band to a frequency band from a Nyquist zone different than the common Nyquist zone.
2. The telecommunication system of claim 1 , further comprising:
second circuitry configured to:
extract signals from the combined frequency band to the frequency band from a Nyquist zone different than the common Nyquist zone, and
transmit, to the at least one receiving base station or the at least one receiving terminal device, signals at the frequencies corresponding to the extracted signals in the frequency band.
3. The telecommunication system of claim 2 , wherein the second circuitry is further configured to:
extract additional signals from the combined frequency band to an additional frequency band from a Nyquist zone used as the common Nyquist zone, and
transmit, to the at least one receiving base station or the at least one receiving terminal device, additional signals at additional frequencies corresponding to the extracted additional signals in the additional frequency band.
4. The telecommunication system of claim 3 ,
wherein the Nyquist zone used as the common Nyquist zone is a first Nyquist zone, and
wherein the Nyquist zone different than the common Nyquist zone is a second Nyquist zone or a third Nyquist zone.
5. The telecommunication system of claim 2 , wherein the second circuitry is further configured to:
extract additional signals from the combined frequency band to an additional frequency band from an additional Nyquist zone different from the common Nyquist zone, and
transmit, to the at least one receiving base station or the at least one receiving terminal device, additional signals at the additional frequencies corresponding to the additional extracted signals in the additional frequency band.
6. The telecommunication system of claim 5 ,
wherein the Nyquist zone used as the common Nyquist zone is a first Nyquist zone,
wherein the Nyquist zone different than the common Nyquist zone is a second Nyquist zone, and
wherein the additional Nyquist zone different than the common Nyquist zone is a third Nyquist zone.
7. The telecommunication system of claim 5 , wherein the Nyquist zone different than the common Nyquist zone is not adjacent to the additional Nyquist zone different than the common Nyquist zone.
8. The telecommunication system of claim 5 , wherein the first circuitry comprises:
a down-conversion stage configured to down-convert the received signals to at least one intermediate frequency;
a first filter configured to receive the down-converted signals from the down-conversion stage and select down-converted signals in the first frequency band, wherein the first frequency band corresponds to the Nyquist zone different than the common Nyquist zone;
a second filter configured to receive the down-converted signals from the down-conversion stage and select down-converted signals in the second frequency band, wherein the second frequency band corresponds to the additional Nyquist zone different than the common Nyquist zone; and
a combiner configured to combine the selected signals in the first and second frequency bands, wherein the first section is configured to sample the combined down-converted signals.
9. The telecommunication system of claim 8 , wherein the at least one intermediate frequency comprises a first intermediate frequency and a second intermediate frequency, wherein the down-conversion stage comprises:
a first mixer configured to down-convert the received signals to the first intermediate frequency and providing the received signals at the first intermediate frequency to the first filter; and
a second mixer configured to down-convert the received signals to the second intermediate frequency and providing the received signals at the second intermediate frequency to the first filter.
10. The telecommunication system of claim 9 , wherein the down-conversion stage further comprises a local oscillator configured to provide a common local oscillation signal to the first mixer and the second mixer.
11. The telecommunication system of claim 9 , wherein the down-conversion stage further comprises a first local oscillator configured to provide a first local oscillation signal to the first mixer and a second local oscillator configured to provide a second local oscillation signal to the second mixer, wherein the first and second local oscillation signals have different frequencies that are configured to prevent the first set of aliased signals and the second set of aliased signals from overlapping within the common Nyquist zone.
12. The telecommunication system of claim 2 , wherein the second circuitry is configured to convert the digital signals to be transmitted using a second sampling rate different from the first sampling rate.
13. The telecommunication system of claim 2 , wherein the telecommunication system comprises a repeater; and
wherein the first circuitry comprises:
a downlink receiver section comprising a donor antenna configured to receive downlink signals, and
an uplink receiver section comprising a coverage antenna configured to receive uplink signals;
wherein the second circuitry comprises:
a downlink transmitter section comprising an additional coverage antenna configured to transmit the downlink signals, and
an uplink transmitter section comprising an additional donor antenna configured to transmit the uplink signals.
14. The telecommunication system of claim 2 ,
wherein the telecommunication system comprises a distributed antenna system comprising:
a master unit configured to receive downlink signals from the at least one transmitting base station in the plurality of frequency bands; and
a remote unit communicatively coupled to the master unit, the remote unit configured to transmit the downlink signals extracted from the combined frequency band to the at least one receiving terminal device;
wherein the master unit comprises the first circuitry; and
wherein the remote unit comprises the second circuitry.
15. The telecommunication system of claim 1 , wherein the common Nyquist zone is a first Nyquist zone and the Nyquist zone different than the common Nyquist zone is a second Nyquist zone or a third Nyquist zone.
16. The telecommunication system of claim 1 , wherein the first circuitry is further configured to generate digital signals by sampling the received signals at a first sampling rate.
17. The telecommunication system of claim 1 , wherein the telecommunication system comprises a repeater.
18. A method comprising:
receiving signals from at least one transmitting base station or at least one transmitting terminal device, the received signals having frequencies in a plurality of frequency bands;
generating, from the received signals, a first set of aliased signals corresponding to signals in a first frequency band and a second set of aliased signals corresponding to signals in a second frequency band, wherein the first set of aliased signals and the second set of aliased signals are generated by sampling the received signals such that the received signals are aliased;
combining the first set of aliased signals and the second set of aliased signals into a combined frequency band in a common Nyquist zone, wherein the first set of aliased signals and the second set of aliased signals are non-overlapping within the common Nyquist zone;
extracting signals from the combined frequency band to a Nyquist zone different than the common Nyquist zone; and
transmitting, to at least one receiving base station or at least one receiving terminal device, signals at frequencies corresponding to the extracted signals in the frequency band.
19. The method of claim 18 , further comprising:
extracting additional signals from the combined frequency band, and
transmitting, to the at least one receiving base station or the at least one receiving terminal device, the additional extracted signals at additional frequencies in an additional frequency band from the common Nyquist zone.
20. The method of claim 18 , further comprising:
extracting additional signals from the combined frequency band to an additional frequency band from an additional Nyquist zone different from the common Nyquist zone, and
transmitting, to the at least one receiving base station or the at least one receiving terminal device, additional signals at additional frequencies corresponding to the additional extracted signals.
21. A distributed antenna system comprising:
a master unit communicatively coupled to a base station, the master unit configured to:
receive downlink signals from the base station, the downlink signals having frequencies in a plurality of frequency bands,
select a first frequency band and a second frequency band,
generate, from the received downlink signals, a first set of aliased downlink signals corresponding to signals in a first frequency band and a second set of aliased downlink signals corresponding to signals in a second frequency band, wherein the first section is configured to generate the first set of aliased signals and the second set of aliased signals by sampling the downlink signals such that the downlink signals are aliased, and
combine the first set of aliased downlink signals and the second set of aliased downlink signals into a combined frequency band in a common Nyquist zone, wherein the first set of aliased downlink signals and the second set of aliased downlink signals are non-overlapping within the common Nyquist zone; and
a remote unit communicatively coupled to the master unit, the remote unit configured to:
extract signals from the combined frequency band to a frequency band from a Nyquist zone different than the common Nyquist zone; and
transmit to at least one receiving terminal device, signals at frequencies corresponding to the extracted signals in the frequency band.
22. The distributed antenna system of claim 21 , wherein the remote unit is further configured to:
extract additional signals from the combined frequency band to an additional frequency band from a Nyquist zone used as the common Nyquist zone, and
transmit, to the at least one receiving terminal device, additional signals at additional frequencies corresponding to the additional extracted signals in the additional frequency band.
23. The distributed antenna system of claim 21 , wherein the remote unit is further configured to:
extract additional signals from the combined frequency band to an additional frequency band from an additional Nyquist zone different from the common Nyquist zone; and
transmit, to the at least one receiving terminal device, additional signals at additional frequencies corresponding to the additional extracted signals in the additional frequency band.
24. The distributed antenna system of claim 23 , wherein the master unit comprises:
a first filter configured to select the first frequency band, wherein the first frequency band corresponds to the Nyquist zone different than the common Nyquist zone;
a second filter configured to select the second frequency band, wherein the second frequency band corresponds to the additional Nyquist zone different from the common Nyquist zone;
a combiner configured to combine the downlink signals in the first and second frequency bands; and
an analog-to-digital converter configured to sample the combined downlink signals.
25. The distributed antenna system of claim 21 ,
wherein the master unit comprises an analog-to-digital converter configured to sample the downlink signals at a first sampling rate to generate digital downlink signals; and
wherein the remote unit comprises a digital-to-analog converter configured to sample the digital downlink signals to analog downlink signals using a second sampling rate different from the first sampling rate.
26. The distributed antenna system of claim 21 , wherein the master unit comprises an interpolating digital-to-analog converter, wherein the interpolating digital-to-analog converter is configured to sample the received signals at a complex frequency-shifting sampling rate.