E-mail to us

More Efficient and Discreet – PCMA Multi-access Communication Technology

Satellite communication is a communication method between two terminals on the ground through artificial earth satellite relay. Since 1960, when American researchers completed the first satellite relay communication through “Echo I”, after more than 70 years of development, satellite communication has penetrated into people’s daily work and life. At present, satellite communication resources (frequency band, power, etc.) are still very important communication resources.


How to efficiently use satellite communication resources has always been one of the important research directions in this field. In 1998, Mark Dankberg, an engineer at ViaSat in the United States, proposed a new technology for two-way satellite communication: PCMA: Paired Carrier Multiple Access.


PCMA Multi-access Communication Technology


This technology enables both communication parties to transmit their respective signals on the same frequency band, and the signal processing at the receiving end makes it have the same reception sensitivity as the traditional communication method; However, the utilization rate of spectrum resources is more than double higher than that of traditional multi-access methods. Therefore, PCMA technology has a unique advantage in terms of the interest rate of spectrum resources.


The basic principle of PCMA is that the signals of terminals A and B are transmitted simultaneously on the same transponder band r(t) = sA(t) + sB(t) + n(t). If it is a third party, it is impossible to recover the corresponding transmission bitstream, but as one of the two parties to the communication, the A terminal subtracts its own transmit signal when receiving the signal, so that it can receive the transmitted signal of the other terminal B: rA(t) = r(t) - sA(t) = sB(t) + n(t), thereby restoring the bitstream sent by the opposite.


As we can see from the above technology, since the transmitted signals of the two sides of the communication are superimposed, this will also increase the difficulty of receiving third parties. Therefore, PCMA technology has a natural ability to resist interception. At present, the technology has been applied in some special areas.

In today’s world where frequency resources are still scarce, more efficient and more discreet PCMA technology will play a bigger role.

Related Cowave Satellite Terminal News

Jul
08
2022
Jul 08 2022
Application of VSAT Satellite Communication System Technology
VSAT stations can easily form flexible and economical network systems with different scales, different speeds and different uses. A VSAT network can generally accommodate 200 to 500 stations, and ther...
Read More
Application of VSAT Satellite Communication System Technology
Oct
10
2022
Oct 10 2022
Breaking news! COWAVE was selected as a national-level S.R.C.I "LITTLE GIANT" company.
Recently, the Ministry of Industry and Information Technology of the People's Republic of China has carried out the evaluation of the fourth batch of "LITTLE GIANT" company. Through the multi-level screening, it stood out among many participating companies and was successfully selected as a national-level Specialized, Refined, Characteristic, and Innovative "LITTLE GIANT" company.
Read More
Breaking news! COWAVE was selected as a national-level S.R.C.I
Nov
10
2022
Nov 10 2022
BWM300C Satellite Hub Station Terminal!
BWM300C Satellite Hub Station Terminal!More and Stronger!
Read More
BWM300C Satellite Hub Station Terminal!
Cowave Communication Technology Co., Ltd.
sales@cowave.com
+86-025-85281735
9/F, B7, Qilin AI innovation Park, #266 Chuangyan RD., Jiangning Dist., Nanjing, P.R.China
9/F, B7, Qilin AI innovation Park, #266 Chuangyan RD., Jiangning Dist., Nanjing, P.R.China
sales@cowave.com +86-025-85281735