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The difference between wireless module transmitting and receiving the same frequency and different frequencies [Copy link]

Many wireless modules are bidirectional transmission. Some people who have just entered this industry may not understand the difference between sending and receiving at the same frequency and at different frequencies. In response to this problem, this article will help you to understand the difference between them. 215)] The so-called same-frequency transmission and reception means that the receiving frequency and the transmitting frequency can be the same, and different frequencies mean that the receiving frequency and the transmitting frequency are different. 215)] In data acquisition and control systems, the same frequency mode only requires one frequency, while the different frequency mode requires two frequencies. For a system consisting of a master station and multiple slave stations, the transmission from the master station to the slave station is called uplink, and the transmission from the slave station to the master station is called uplink. In the same frequency mode, the uplink frequency is the same as the downlink frequency. In the different frequency system, the downlink transmission uses one frequency and the uplink transmission uses another frequency. 215)] When do we use the same frequency and when do we use different frequencies? From the perspective of efficient use of frequency resources and radio management, it is more desirable to adopt the co-frequency mode. 215)] , 215)] 215)] Full-duplex data transmission radio can carry out downlink and uplink transmission simultaneously, and must use the heterodyne mode. 215)] The above is the difference between the same frequency and different frequency of wireless module transmission and reception. Through the above description, everyone should have a deeper understanding of the same frequency and different frequency. 215)] Full-duplex data transmission radio can carry out downlink and uplink transmission simultaneously, and must use the heterodyne mode. 215)] The above is the difference between the same frequency and different frequency of wireless module transmission and reception. Through the above description, everyone should have a deeper understanding of the same frequency and different frequency. 215)] Full-duplex data transmission radio can carry out downlink and uplink transmission simultaneously, and must use the heterodyne mode. 215)] The above is the difference between the same frequency and different frequency of wireless module transmission and reception. Through the above description, everyone should have a deeper understanding of the same frequency and different frequency.
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Co-frequency means that the same frequency is used for transmission and reception, and heterogeneous frequency means that different frequencies are used for transmission and reception. Each has its own strengths. For example, co-frequency can use fewer frequency resources for two-way communication; and heterogeneous frequency transmission and reception use different frequency resources, so there is less interference between each other, and transmission and reception are relatively easy to control. When communicating on the same frequency, time division multiplexing can be used, that is, different time periods are specified for transmission and reception. 4G LTE-TDD uses this time division multiplexing.  Details Published on 2019-2-10 22:46

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Your post is very good. Many people think that real-time full-duplex transmission and reception on a single channel seems very simple, but in fact it is not yet possible in the current communications industry.
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 The above is the difference between the same frequency and different frequency of wireless module transmission and reception. Through the above description, everyone should have a deeper understanding of the same frequency and different frequency.
This post is from Analog electronics
 
 
 
 

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captzs posted on 2018-7-26 10:31 Your post is very good. Many people think that single-channel real-time full-duplex transmission and reception seems very simple, but in fact, it is not yet possible in the current communication industry.
If the switching is fast enough so that you can't feel the obvious delay, half-duplex will become "full-duplex". For example, using WeChat on a mobile phone to video chat via WIFI, WIFI is time-division multiplexing on the same frequency, but the video and voice of both parties feel connected.
This post is from Analog electronics
 
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captzs posted on 2018-7-26 10:31 Your post is very good. Many people think that real-time full-duplex transmission and reception on a single channel seems very simple, but in fact it is not possible in the current communication industry.
For a single channel to be "full-duplex" (perhaps it should be called "pseudo full-duplex"), both parties need memory to buffer the data sent and received.
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Co-frequency means that the same frequency is used for transmission and reception, and heterogeneous frequency means that different frequencies are used for transmission and reception. Each has its own strengths. For example, co-frequency can use fewer frequency resources for two-way communication; and heterogeneous frequency transmission and reception use different frequency resources, so there is less interference between each other, and transmission and reception are relatively easy to control. When communicating on the same frequency, time division multiplexing can be used, that is, different time periods are specified for transmission and reception. 4G LTE-TDD uses this time division multiplexing.
This post is from Analog electronics
 
 
 
 

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