Remote radio head

• US 9,871,593 B2
• Filed: 03/07/2016
• Issued: 01/16/2018
• Est. Priority Date: 09/06/2013
• Status: Active Grant

• Current Assignee: KMW Incorporated
• Original Assignee: KMW Incorporated
• Inventors: Kim, Duk-Yong, Jeong, Bea-Mook, Kang, Sang-Hyo
• Primary Examiner(s): Torres, Juan A
• Application Number:
  US15/062,651
• Publication Number:
  US 20160191164A1
• Time in Patent Office: 680 Days
• Field of Search: 398115
• CPC Class Codes: G02B 6/4293 hybrid electrical and optical connections for transmitting electrical and optical signals
• CPC Class Codes: H04B 10/25759 Details of the reception of RF signal or the optical conversion before the optical fibre

Abstract

A remote radio head is provided. The remote radio head includes at least one integrated connection terminal for integrating and receiving at least one optical signal with at least one power source, a power supply unit which receives and supplies the power source by converting into an internal driving power source of a corresponding remote radio head, a photoelectric/electrooptic conversion unit for receiving and converting the optical signal into an electric signal, a framer for restoring the electric signal converted in the photoelectric/electrooptic conversion unit according to a preset signal demodulation format, a digital signal processing unit receives a signal outputted from the framer to adjust a waveform and a level in a digital level and a transmission and reception signal conversion module which converts a signal into a high-frequency transmission wireless signal, and amplifies the signal at a high power to output the signal to an antenna side.

Claims

1. A remote radio head comprising:

at least one integrated connection terminal that integrates at least one optical signal with at least one power source so as to receive the integrated optical signal;

a power supply unit that receives power source from the integrated connection terminal, and supplies the converted power source by converting the received power source into internal driving power source of a corresponding remote radio head;

a photoelectric/electrooptic conversion unit that receives an optical signal output from the integrated connection terminal so as to convert the received optical signal into an electrical signal;

a framer that reconstructs the electrical signal converted in the photoelectric/electrooptic conversion unit according to a pre-configured signal demodulation format;

a digital signal processing unit that receives the signal output from the framer so as to perform level adjustment and waveform adjustment in a digital level; and

a transmission and reception signal conversion module that converts a signal output from the digital signal processing unit into a wireless transmission signal of a high frequency, amplifies the signal at a high output power so as to output the signal to a side of an antenna.

2. The remote radio head according to claim 1, wherein the photoelectric/electrooptic conversion unit is implemented by a structure of at least one Small Form-factor Pluggable (SFP) optical transceiver, and the framer has a structure of at least one serial-to-parallel/parallel-to-serial converter according to a Common Public Radio Interface (CPRI) standard.

3. The remote radio head according to claim 1, wherein the digital signal processing unit includes sub-components performing a digital up conversion function of amplifying a level of a digital signal, a Crest Factor Reduction (CRF) function for crest factor reduction, and a Digital Pre-Distortion (DPD) function of previously distorting a digital signal.

4. The remote radio head according to claim 1, further comprising:

a sub-integrated connector that is connected to an optical signal and power of the integrated connection terminal in parallel.

5. The remote radio head according to claim 1, wherein the transmission and reception signal conversion module comprises:

a digital/analog converter that converts an output signal of the digital signal processing unit into an analog signal of an Intermediate Frequency (IF) so as to output the analog signal;

a frequency up converter that converts an IF signal output from the digital/analog converter into a high frequency signal of a transmission frequency band;

a transmission amplifier that receives an output of the frequency up converter so as to amplify the received output in a transmission power level;

a transmission and reception separation unit that provides the output from the transmission amplifier to a side of an antenna through an antenna connection terminal, and separates a reception signal provided from the side of the antenna through the antenna connection terminal from a path of the transmission signal so as to output the signal;

a reception amplifier that amplifies a reception signal separated and output from the transmission and reception separation unit;

a frequency down converter that converts a reception signal of a high frequency output from the reception amplifier into a signal of an intermediate frequency; and

an analog/digital converter that converts the signal converted in the frequency down converter into an analog/digital signal so as to provide the signal to the digital signal processing unit.

6. The remote radio head according to claim 5, wherein the digital signal processing unit provides a reception signal provided in the analog/digital converter to the framer, the framer modulates a reception signal provided from the digital signal processing unit according to a preconfiguration transmission format so as to output the signal, and the photoelectric/electrooptic conversion unit generates an optical signal according to a signal output and modulated in the framer so as to transmit the generated optical signal to a side of the baseband signal processing equipment through the opto-electric hybrid connection terminal.