What Are QAM Channels?

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QAM channels are the variety of different formats of QAMs which are used in many radio communications and data delivery applications. Some specific variants of QAMs channel are used in some specific applications and standards.

Let us assume that by using QAM we want to transmit a symbol consisting of 4 bits. That means N=4 and there are 24 = 16 different possible symbols. Hence the QAM system can generate 16 different distinguishable signals. It is known as a 16-QAM. By using 16-QAM we can modulate the carrier signal into any of 16 different phase and amplitude states.

Examples of some other QAM formats or channels are 16-QAM, 32-QAM, 64-QAM,128-QAM, and 256-QAM.

The number of QAM symbols or states is determined by the number of binary bits per second.

The number of possible symbols for QAM channels is given by

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  \begin{align*} M = 2^N \end{align*}

Here, the term “symbol” means a combination of amplitude and phase.

Depending on the number of bits per message or symbol the QAM signals are classified as follows:

Name Bits per symbol Number of symbols
16 QAM 4 24 = 16
32 QAM 5 25 = 32
64 QAM 6 26 = 64
128 QAM 7 27 = 128
256 QAM 8 28 = 256

16 QAM

16 QAM is one of the different formats of QAM in which the carrier signal is modulated into any of 16 different phase and amplitude states.

How many bits per symbol can be transmitted using 16-QAM?

By using 16-QAM 4 bits per symbol can be transmitted.

32 QAM

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32 QAM is one of the different formats of QAM in which the carrier signal is modulated into any of 32 different phase and amplitude states.

How many bits per symbol can be transmitted using 32-QAM?

By using 32-QAM 5 bits per symbol can be transmitted.

64 QAM

64 QAM is one of the different formats of QAM in which the carrier signal is modulated into any of 64 different phase and amplitude states.

How many bits per symbol can be transmitted using 64-QAM?

By using 64-QAM 6 bits per symbol can be transmitted.

128 QAM

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128 QAM is one of the different formats of QAM in which the carrier signal is modulated into any of 128 different phase and amplitude states.

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