Methods and apparatus for transmitting signals
Assigneeu-blox AG
InventorsNorman Beamish, Robert Ronan, Graham Smith
Life of this patent
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Abstract
Methods and apparatus for transmitting signals, the transmitter including a memory storing instructions and a controller configured to execute the instructions to cause the transmitter to determine whether a value of transmitter power is less than a threshold, responsive to a determination that the value of transmitter power is less than the threshold: mix a baseband signal with a first oscillator signal to produce a very-low intermediate frequency (VLIF) signal; mix the VLIF signal with a second oscillator signal to produce a radio frequency (RF) signal, and transmit the RF signal.
Claims17
A transmitter for transmitting signals, the transmitter comprising:
- a memory storing instructions and a controller configured to execute the instructions to cause the transmitter to:
- determine whether a value of transmitter power is less than a threshold;
- responsive to a determination that the value of transmitter power is less than the threshold:
- mix a baseband signal with a first oscillator signal to produce a very-low intermediate frequency (VLIF) signal;
- mix the VLIF signal with a second oscillator signal to produce a radio frequency (RF) signal;
- and
- transmit the RF signal;
- wherein:
- the VLIF signal comprises a first VLIF;
- an oscillator frequency is equal to a carrier frequency plus a second VLIF;
- and
- the first VLIF is equal to the oscillator frequency minus a system-specific frequency.
A transmitter for transmitting signals, the transmitter comprising:
- a first mixer configured to mix a baseband signal with a first oscillator signal to produce a very-low intermediate frequency (VLIF) signal, wherein the first oscillator signal comprises a VLIF and the VLIF is greater than half of a channel bandwidth and less than the half of the channel bandwidth plus an out-of-band bandwidth;
- and
- an RF circuit comprising a second mixer, wherein:
- the second mixer is configured to mix the VLIF signal with a second oscillator signal to produce a radio frequency (RF) signal;
- and
- the RF circuit is configured to transmit the RF signal.
A method for transmitting signals, the method comprising:
- determining whether a value of transmitter power is less than a threshold;
- responsive to a determination that the value of transmitter power is less than the threshold:
- mixing a baseband signal with a first oscillator signal to produce a very-low intermediate frequency (VLIF) signal;
- mixing the VLIF signal with a second oscillator signal to produce a first radio frequency (RF) signal;
- and
- transmitting the first RF signal;
- and
- responsive to a determination that the value of transmitter power is not less than the threshold:
- mixing the baseband signal with a third oscillator signal to produce a second RF signal, wherein the third oscillator signal comprises a carrier frequency;
- and
- transmitting the second RF signal.
Dependencies are inferred from the claim text.