RF vs Baseband | difference between RF and Baseband
This page compares RF vs Baseband and mentions difference between RF and Baseband. The applications of RF(Radio Frequency) and Baseband are also mentioned.
RF | Radio Frequency
Following points describe RF or Radio Frequency:
• Definition: The frequencies higher in the range usually from 3KHz to 300 GHz is known as radio frequencies. This is shown in the figure-1.
• There are different bands defined under RF range viz. from ELF (Extremely Low Frequency) to EHF (Extremely High Frequency).
• Modulation is applied to RF signals before transmission.
• BPF (Band Pass Filtering) is used to extract desired RF signal and later they are downconverted to baseband signal to retrieve information.
• RF to Baseband conversion is done using heterodyne or homodyne architecture based on RF mixers.
• The various types of transmission lines and coaxial lines are used as RF channels for transmission of RF signals.
• Used for transmission of information (voice/data) over the air after conversion to RF frequencies as per requirement of different wireless technologies viz. WLAN, WiMAX, GSM, CDMA, LTE, Zigbee, Z-wave, LoRa etc. Different wireless technologies use different frequency bands as per link budget requirements.
• RF is used in numerous medical applications viz. RF ablation, Skin tightening, spectroscopy, telemetry, Wireless Body Area Network etc.
• RF is used for home automation, automatic car parking, meter reading etc.
• Radio frequencies are used for over the air transmission as it withstand against channel which is not possible with baseband signals.
Refer more on What is RF>>.
Baseband Frequency | Near Zero Frequency
Following points describe Baseband Frequency:
• Definition: The signal which has non-zero magnitude near to zero frequencies and will have negligible magnitude at other frequencies is known as baseband frequency. This is shown in the figure-1.
• The bandwidth of baseband signal is equal to highest frequency component present in the signal.
• It is also named as physical layer as it exists at OSI layer-1.
• Modulation is not applied to baseband signals before transmission.
• LPF (Low Pass Filtering) is used to retrieve baseband information as they are present in the vicinity of zero frequency.
• Baseband to RF conversion is done using heterodyne or homodyne based architecture based on RF mixers.
• Serial cable and twisted pair cables used in LANs are examples of baseband channels used for transmission of baseband signals.
• Baseband signals are not suitable for over the air transmission and are mainly used for wired transmission.
• Ethernet physical layer standards 10Base5, 100Base-Tx etc.
• Baseband signal processing in DSP or FPGA, which will contain physical layer of any wired or wireless standards.
• Usually the output of ADC (Analog to Digital Converter) will have information at baseband frequencies.
RF and Baseband Related Links
Medical RF Applications Related Links
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