Systems and methods for multiband delta sigma digitization
AssigneeCable Television Laboratories, Inc.
InventorsJing Wang, Zhensheng Jia, Luis Alberto Campos
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Abstract
A digital mobile fronthaul (MFH) network includes a baseband processing unit (BBU) having a digitization interface configured to digitize, using delta-sigma digitization, at least one wireless service for at least one radio access technology. The network further includes a transport medium in operable communication with the BBU. The transport medium is configured to transmit a delta-sigma digitized wireless service from the BBU. The network further includes a remote radio head (RRH) configured to operably receive the delta-sigma digitized wireless service from the BBU over the transport medium.
Claims20
A digital network, comprising:
- a central processing unit including a digitization interface configured to (i) digitize, using delta-sigma digitization, at least one wireless service for at least one radio access technology (RAT) into a delta-sigma digitized wireless service, and (ii) implement a noise transfer function corresponding to a signal band of the at least one wireless service;
- a digital transport medium (i) in operable communication with the central processing unit, and (ii) configured to transmit the delta-sigma digitized wireless service from the central processing unit;
- and
- a radio receiver disposed remotely from the central processing unit and including a filter corresponding to the noise transfer function of the digitization interface, the radio receiver configured to (i) operably receive the delta-sigma digitized wireless service from the central processing unit over the digital transport medium, (ii) filter the received delta-sigma digitized wireless service into a filtered digital signal, and (iii) convert the filtered digital signal into an analog radio frequency (RF) signal.
A method for performing delta-sigma digitization of an aggregated signal, the aggregated signal including a plurality of different signal bands from a communication network, the method comprising the steps of:
- oversampling the aggregated signal at rate equal to an oversampling rate times the Nyquist sampling rate, to generate an oversampled signal and quantization noise;
- noise shaping the oversampled signal to implement a noise transfer function (NTF) and push the quantization noise into out-of-band frequency spectra corresponding to respective spectral portions between the plurality of different signal bands;
- transmitting the noise shaped signal over a digital transport medium;
- and
- filtering the transmitted noise shaped signal, received from the digital transport medium, using a filter corresponding to the NTF to remove the out-of-band quantization noise from the plurality of different signal bands.
Dependencies are inferred from the claim text.