Baseband
Baseband transmission can be simply understood as a number of binary signal (digital baseband signal) is directly transmitted without modulation is just starting a wide band from the transmission side is occupied
Baseband: Baseband source (information source, also known as the transmitter) is not emitted modulated (for spectrum shifting the original electrical signal and converting) inherent to the frequency band (frequency bandwidth), referred to as base band, referred to as the baseband.
And a baseband band, respectively.
frequency band
Band: the frequency bandwidth of the modulated baseband signal occupied (occupied by a signal from the lowest frequency to the highest frequency difference).
Some of the carriers is transmitted on a frequency band specific frequency modulated (digital modulation) for remote transmission or radio transmission digital signal
Broadband
For example, the broadband signal is different permissible channel transmitted on the same frequency division multiplexing interfering on one channel band can be transmitted simultaneously with different sub-channels
Broadband (Broadband) transmission: channel is divided into a plurality of subchannels, each transmit audio, video and digital signals, known as broadband transmission
Link capacity can be decomposed into two or more channels, each channel may carry different signals, which is broadband transmission.
All channels in a broadband transmission signal can be sent simultaneously. The CATV, ISDN and the like. Transmission frequency band is wide in> = 128kbps
A broadband analog transmission signal,
Baseband transmission and broadband transmission has the following advantages:
can be transmitted in a channel in a voice, image and data information, the system has many uses;
a wideband channel can be divided into a plurality of logical channel baseband, it is multiplexed, thus greatly increased channel capacity;
distance than broadband transmission baseband far as digital baseband transmission signal transmitted directly, the higher the transmission rate, the transmission distance can be shorter.
bandwidth
Bandwidth is another concept of:
Most of the energy signals are concentrated in a relatively narrow band range, we will concentrate most of the energy of that part of the signal band is called the effective bandwidth (refer to a signal having a frequency bandwidth), referred to as bandwidth.
Before transmitting the communication line is mainly an analog signal, so the frequency is measured in units, such as, Hz, kHz, MHz like.
Now lines are used for transmitting digital signals, so the bandwidth of the communication link can be used in the transmission rate of the digital signal to measure, also called bit rate, communication rate, data (transfer) rate.
reference:
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