Reducing transmission signal artifact spacing
View Patent ↗A method of generating a transmission signal may include mixing a baseband signal assigned for transmission within a narrow frequency range (“assigned narrow frequency range”) included in a wireless communication channel to produce a shifted signal. The shifted signal may have a shifted frequency that is based on a shift from the assigned narrow frequency range toward a center frequency of the wireless communication channel by a frequency offset. The method may further include shifting a modulation frequency of a modulating signal toward the assigned narrow frequency range frequency range and away from the center frequency by the frequency offset. Additionally, the method may include mixing the shifted signal with the modulating signal to produce a transmission signal having a transmission frequency within the assigned narrow frequency range.
1. A method of generating a transmission signal, the method comprising:
mixing a baseband signal assigned for transmission within an assigned narrow frequency range of a wireless communication channel to produce a shifted signal with a shifted frequency that is based on the assigned narrow frequency range and a frequency offset associated with a modulating signal;
shifting a modulation frequency of the modulating signal toward the assigned narrow frequency range and away from a center frequency of the wireless communication channel by the frequency offset; and
mixing the shifted signal with the modulating signal to produce a transmission signal having a transmission frequency within the assigned narrow frequency range.
2. The method of claim 1 , further comprising generating the modulating signal with an agile frequency source.
3. The method of claim 1 , wherein the wireless communication channel is associated with a Long Term Evolution (LTE) wireless communication channel.
4. The method of claim 1 , further comprising performing the mixing of the baseband signal based on a frequency associated with the assigned narrow frequency range.
5. The method of claim 1 , further comprising transmitting the transmission signal as a wireless communication signal.
6. The method of claim 1 , wherein mixing the baseband signal comprises performing complex multiplication involving the baseband signal and the frequency offset to produce the shifted signal.
7. The method of claim 1 , further comprising determining the frequency offset based on an allowed amount of interference caused by the transmission signal to one or more of a neighboring frequency band of a frequency band of which the channel is included and a neighboring channel of the channel.
8. The method of claim 1 , wherein the assigned narrow frequency range is assigned based on a Long Term Evolution (LTE) wireless communication resource block.
9. The method of claim 1 , further comprising using a digital single-sideband mixer to digitally mix the assigned narrow frequency range signal.
10. The method of claim 1 , further comprising performing analog mixing to mix the shifted signal with the modulating signal to produce the transmission signal.
11. The method of claim 1 , further comprising performing digital mixing to mix the shifted signal with the modulating signal to produce the transmission signal.
12. A system of generating a transmission signal, the system comprising:
a first mixer configured to mix a baseband signal assigned for transmission within an assigned narrow frequency range of a wireless communication channel to produce a shifted signal with a shifted frequency that is based on the assigned narrow frequency range and a frequency offset associated with a modulating signal;
a frequency source configured to generate the modulating signal with a modulation frequency shifted toward the assigned narrow frequency range and away from a center frequency of the wireless communication channel by the frequency offset; and
a second mixer configured to mix the shifted signal with the modulating signal to produce a transmission signal having a transmission frequency within the assigned narrow frequency range.
13. The system of claim 12 , wherein the wireless communication channel is associated with a Long Term Evolution (LTE) wireless communication channel.
14. The system of claim 12 , wherein the first mixer is configured to perform the mixing of the baseband signal based on a frequency associated with the assigned narrow frequency range.
15. The system of claim 12 , further comprising an antenna configured to transmit the transmission signal as a wireless communication signal.
16. The system of claim 12 , wherein the first mixer is configured to digitally mix the baseband signal by performing complex multiplication involving the baseband signal and the frequency offset to produce the shifted signal.
17. The system of claim 12 , further comprising a processing device configured to determine the frequency offset based on an allowed amount of interference caused by the transmission signal to one or more of a neighboring frequency band of a frequency band of which the channel is included and a neighboring channel of the channel.
18. The system of claim 12 , wherein the assigned narrow frequency range is assigned based on a Long Term Evolution (LTE) wireless communication resource block.
19. The system of claim 12 , wherein the second mixer includes an analog mixer.
20. The system of claim 12 , wherein the second mixer includes a digital mixer.