Signal processing of fragmented downlink carriers

An apparatus comprising:

• processing circuitry configured to:
• process, using a first local oscillator (LO), a first analog signal and a second analog signal to generate first digital signal and a second digital signal to a reference frequency of the first LO, wherein the first analog signal and the second analog signal are separated by a frequency offset that comprises the reference frequency, and wherein the first digital signal and the second digital signal are separated by a frequency gap, wherein the first digital signal comprises a positive intermediate (IF) frequency, and wherein the second digital signal comprises a negative IF frequency;
• downshift, using a second LO, the first digital signal based on the reference frequency to generate a downshifted digital signal,
• upshift, using a third LO, the second digital signal based on the reference frequency to generate an upshifted digital signal, and
• combine, using an adder, the downshifted digital signal and upshifted digital signal to generate a combined digital signal, wherein the downshifted digital signal is orthogonal to the upshifted digital signal;
• and
• memory coupled to the processing circuitry, the memory configured to store signal information.

One or more non-transitory computer-readable media having stored thereon a sequence of instructions which, when executed by one or more processors, cause processing circuitry to:

• determine whether a first total bandwidth of a first analog signal, a second analog signal, and a frequency offset separating the first analog signal and the second signal is greater than a threshold bandwidth;
• process the first analog signal and the second analog signal to generate first digital signal and a second digital signal to a reference frequency, and wherein the first digital signal and the second digital signal are separated by the frequency gap, wherein the first digital signal comprises a positive intermediate (IF) frequency, and wherein the second digital signal comprises a negative IF frequency;
• downshift the first digital signal based on the reference frequency to generate a downshifted digital signal based on determining whether the first total bandwidth of the first digital signal, the second digital signal, and the frequency gap separating the first digital signal and the second digital signal is greater than the threshold bandwidth;
• upshift the second digital signal based on the reference frequency to generate an upshifted digital signal based on determining whether the first total bandwidth of the first digital signal, the second digital signal, and the frequency gap separating the first digital signal and the second digital signal is greater than the threshold bandwidth;
• and
• combine the downshifted digital signal and upshifted digital signal to generate a combined digital signal, wherein the downshifted digital signal is orthogonal to the upshifted digital signal, and wherein a second total bandwidth of the combined digital signal is less than the threshold bandwidth.