Distributed radio feed-forward clock synchronization
AssigneeIntel Corporation
InventorsElan Banin, Evgeny Shumaker, Avishay Friedman, Ofir Degani
Life of this patent
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Abstract
A radio-head apparatus can comprise synchronization circuitry to receive transmission data and a phase correction signal. The synchronization circuitry can process the transmission data and the phase correction signal to generate digital transmitter (DTX) codes. The radio-head can further include transmission circuitry to combine the phase correction signal with transmission data codes to be provided to the DTX for transmission over an air interface. Other systems and apparatuses are described.
Claims20
A radio-head (RH) apparatus comprising:
- synchronization circuitry configured to:
- measure a phase discrepancy between a local frequency source and a system reference frequency source to generate a phase correction signal;
- receive transmission data and the phase correction signal;
- and
- process the transmission data and the phase correction signal in a feed-forward manner to generate digital transmitter (DTX) codes for distributed radio transmission;
- and
- transmission circuitry coupled to the synchronization circuitry and configured to:
- combine the phase correction signal with transmission data codes to be provided to the DTX for transmission over an air interface.
A radio-head (RH) apparatus comprising:
- base-band circuitry comprised of:
- synchronization circuitry configured to:
- measure a phase discrepancy between a local frequency source and a system reference frequency source to generate a phase correction signal;
- receive a base-band signal and the phase correction signal;
- perform carrier frequency offset correction (CFOC) to shift a center frequency of the base-band signal using the phase correction signal in a feed-forward manner to generate a shifted base-band signal;
- and
- perform sampling frequency offset correction (SFOC) to resample the shifted base-band signal to generate a resampled base-band signal for distributed radio transmission;
- and
- transmission circuitry coupled to the base-band circuitry and configured to:
- provide the resampled base-band signal over an air interface.
A system comprising:
- a base-band sub-system (BBSS) coupled to at least two radio-head (RH) apparatuses, the BBSS comprising:
- detection circuitry configured to:
- measure a phase discrepancy between a local frequency source of a RH and a system reference frequency source to generate a phase correction signal;
- processing circuitry coupled to the detection circuitry and configured to:
- receive the phase correction signal;
- and
- communicate the phase correction signal to at least one of the RHs over a high-speed serial (HSS) digital interface in a feed-forward manner for distributed radio transmission.
Dependencies are inferred from the claim text.