Transceiver circuit employing shared digital signal processing circuitry for communicating radio frequency (RF) analog communications signals received by a remote unit in a wireless distribution system (WDS)
Embodiments of the disclosure relate to a transceiver circuit employing shared digital signal processing circuitry for communicating radio frequency (RF) analog communications signals received by a remote unit in a wireless distribution system (WDS). A transceiver circuit includes downlink digital signal processing circuitry that receives and processes a downlink digital communications signal(s) having a first downlink digital baseband signal and a second downlink digital baseband signal. A first downlink analog signal path and a second downlink analog signal path share the downlink digital signal processing circuitry. The first downlink analog signal path generates a first downlink analog RF communications signal. The second downlink analog signal path generates a second downlink analog RF communications signal. By sharing the downlink digital signal processing circuitry, it is not necessary to add additional downlink digital signal processing circuitry, thus helping reduce digital component costs of the transceiver circuit.
1. A method for communicating radio frequency (RF) analog communications signals by sharing digital signal processing circuitry in a wireless distribution system (WDS), comprising:
receiving a downlink digital communications signal comprising a first downlink digital baseband signal in a first downlink digital channel and a second downlink digital baseband signal in a second downlink digital channel;
generating an intermediate downlink digital communications signal comprising the first downlink digital baseband signal in a first selected downlink frequency and the second downlink digital baseband signal in a second selected downlink frequency;
converting the intermediate downlink digital communications signal into a downlink analog communications signal comprising a first downlink analog signal in the first selected downlink frequency and a second downlink analog signal in the second selected downlink frequency;
converting the first downlink analog signal into a first downlink analog RF communications signal in a first downlink analog RF channel; and
converting the second downlink analog signal into a second downlink analog RF communications signal in a second downlink analog RF channel;
wherein the first downlink analog RF communications signal in the first downlink analog RF channel and the second downlink analog RF communications signal in the second downlink analog RF channel occupy a downlink RF spectrum wider than a predefined downlink digital signal processing bandwidth associated with generating the intermediate downlink digital communications signal and converting the intermediate downlink digital communications signal into the downlink analog communications signal.
2. The method of claim 1 , further comprising receiving the downlink digital communications signal comprising the first downlink digital baseband signal in the first downlink digital channel and the second downlink digital baseband signal in the second downlink digital channel that occupy a downlink digital spectrum narrower than the the predefined downlink digital signal processing bandwidth.
3. The method of claim 1 , further comprising generating a third downlink analog RF communications signal.
4. The method of claim 1 , further comprising:
receiving a first uplink analog RF communications signal in a first uplink analog RF channel;
converting the first uplink analog RF communications signal into a first uplink analog signal in a first selected uplink frequency;
receiving a second uplink analog RF communications signal in a second uplink analog RF channel;
converting the second uplink analog RF communications signal into a second uplink analog signal in a second selected uplink frequency; and
generating an uplink analog communications signal comprising the first uplink analog signal in the first selected uplink frequency and the second uplink analog signal in the second selected uplink frequency.
5. The method of claim 4 , further comprising:
converting the uplink analog communications signal into an intermediate uplink digital communications signal comprising a first uplink digital baseband signal in the first selected uplink frequency and a second uplink digital baseband signal in the second selected uplink frequency; and
generating an uplink digital communications signal comprising the first uplink digital baseband signal in a first uplink digital channel and the second uplink digital baseband signal in a second uplink digital channel.
6. The method of claim 5 , further comprising generating the uplink digital communications signal comprising the first uplink digital baseband signal in the first uplink digital channel and the second uplink digital baseband signal in the second uplink digital channel that occupy an uplink digital spectrum narrower than a predefined uplink digital signal processing bandwidth of an uplink digital signal processing circuitry.
7. The method of claim 5 , further comprising receiving the first uplink analog RF communications signal in the first uplink analog RF channel and the second uplink analog RF communications signal in the second uplink analog RF channel that occupy an uplink RF spectrum wider than a predefined uplink digital signal processing bandwidth of an uplink digital signal processing circuitry.
8. The method of claim 4 , further comprising receiving a third uplink analog RF communications signal and generating a third uplink analog signal.
9. A wireless distribution system (WDS), comprising:
a central unit; and
a plurality of remote units configured to:
receive a plurality of downlink electrical communications signals from the central unit; and
provide a plurality of uplink electrical communications signals to the central unit;
wherein at least one remote unit among the plurality of remote units comprises a transceiver circuit, comprising:
downlink digital signal processing circuitry having a predefined downlink digital signal processing bandwidth, the downlink digital signal processing circuitry comprising:
a digital up-converter (DUC) configured to:
receive a downlink digital communications signal among the plurality of downlink electrical communications signals, the downlink digital communications signal comprising a first downlink digital baseband signal in a first downlink digital channel and a second downlink digital baseband signal in a second downlink digital channel; and
generate an intermediate downlink digital communications signal comprising the first downlink digital baseband signal in a first selected downlink frequency and the second downlink digital baseband signal in a second selected downlink frequency; and
a digital-to-analog converter (DAC) configured to receive and convert the intermediate downlink digital communications signal into a downlink analog communications signal comprising a first downlink analog signal in the first selected downlink frequency and a second downlink analog signal in the second selected downlink frequency;
a first downlink analog signal path configured to:
receive the downlink analog communications signal; and
convert the first downlink analog signal into a first downlink analog radio frequency (RF) communications signal in a first downlink analog RF channel; and
a second downlink analog signal path configured to:
receive the downlink analog communications signal; and
convert the second downlink analog signal into a second downlink analog RF communications signal in a second downlink analog RF channel;
wherein the first downlink analog RF communications signal in the first downlink analog RF channel and the second downlink analog RF communications signal in the second downlink analog RF channel occupy a downlink RF spectrum wider than the predefined downlink digital signal processing bandwidth of the downlink digital signal processing circuitry.
10. The WDS of claim 9 , wherein the DUC is configured to receive the downlink digital communications signal comprising the first downlink digital baseband signal in the first downlink digital channel and the second downlink digital baseband signal in the second downlink digital channel that occupy a downlink digital spectrum narrower than the predefined downlink digital signal processing bandwidth of the downlink digital signal processing circuitry.
11. The WDS of claim 9 , further comprising a third downlink analog signal path configured to receive the downlink analog communications signal from the DAC and generate a third downlink analog RF communications signal.
12. The WDS of claim 9 , wherein the transceiver circuit further comprises:
a first uplink analog signal path configured to:
receive a first uplink analog RF communications signal in a first uplink analog RF channel; and
convert the first uplink analog RF communications signal into a first uplink analog signal in a first selected uplink frequency;
a second uplink analog signal path configured to:
receive a second uplink analog RF communications signal in a second uplink analog RF channel; and
convert the second uplink analog RF communications signal into a second uplink analog signal in a second selected uplink frequency; and
a signal combiner configured to generate an uplink analog communications signal comprising the first uplink analog signal in the first selected uplink frequency and the second uplink analog signal in the second selected uplink frequency.
13. The WDS of claim 12 , wherein the transceiver circuit further comprises:
uplink digital signal processing circuitry having a predefined uplink digital signal processing bandwidth, the uplink digital signal processing circuitry comprising:
an analog-to-digital converter (ADC) configured to receive and convert the uplink analog communications signal into an intermediate uplink digital communications signal comprising a first uplink digital baseband signal in the first selected uplink frequency and a second uplink digital baseband signal in the second selected uplink frequency; and
a digital down-converter (DDC) configured to:
receive the intermediate uplink digital communications signal from the ADC; and
generate an uplink digital communications signal among the plurality of uplink electrical communications signals comprising the first uplink digital baseband signal in a first uplink digital channel and the second uplink digital baseband signal in a second uplink digital channel.
14. The WDS of claim 13 , wherein the DDC is configured to generate the uplink digital communications signal comprising the first uplink digital baseband signal in the first uplink digital channel and the second uplink digital baseband signal in the second uplink digital channel that occupy an uplink digital spectrum narrower than the predefined uplink digital signal processing bandwidth of the uplink digital signal processing circuitry.
15. The WDS of claim 13 , wherein the first uplink analog signal path and the second uplink analog signal path are respectively configured to receive the first uplink analog RF communications signal in the first uplink analog RF channel and the second uplink analog RF communications signal in the second uplink analog RF channel that occupy an uplink RF spectrum wider than the predefined uplink digital signal processing bandwidth of the uplink digital signal processing circuitry.
16. The WDS of claim 13 , further comprising a third uplink analog signal path configured to receive a third uplink analog RF communications signal and provide a third uplink analog signal to the signal combiner.
17. The WDS of claim 9 , wherein the central unit comprises:
an electrical-to-optical (E/O) converter configured to convert the plurality of downlink electrical communications signals into a plurality of downlink optical fiber-based communications signals, respectively; and
an optical-to-electrical (O/E) converter configured to convert a plurality of uplink optical fiber-based communications signals into the plurality of uplink electrical communications signals, respectively.
18. The WDS of claim 17 , wherein the plurality of remote units comprises:
a plurality of remote unit O/E converters configured to convert the plurality of downlink optical fiber-based communications signals into the plurality of downlink electrical communications signals, respectively; and
a plurality of remote unit E/O converters configured to convert the plurality of uplink electrical communications signals into the plurality of uplink optical fiber-based communications signals, respectively.