Gmsk bits per symbol

An 8PSK signal is able to carry three bits per symbol while the standard GSM Gaussian Minimum Shift Keying (GMSK) carries only 1 bit per symbol.
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EDGE.

1. What does bits per symbol mean?
2. Why GMSK is better than QPSK?
3. What does GMSK mean?
4. What is the bandwidth of MSK?

What does bits per symbol mean?

The bits per symbol is the (modulation's power of 2) × (Forward Error Correction). So for example, in 64-QAM modulation 64 = 2⁶ so the bits per symbol is 6. The Forward Error Correction (FEC) is usually expressed as a fraction; i.e., 1/2, 3/4, etc.

Why GMSK is better than QPSK?

Important Difference Between QPSK and GMSK QPSK also usually incorporates baseband pulse shaping: Thus, shaped QPSK has a variable amplitude (envelope) and hence requires a linear PA. GSMK, on the other hand, has a constant envelope and can operate with nonlinear PAs.

What does GMSK mean?

Gaussian minimum shift keying (GMSK) is a form of frequency shift keying (FSK) used in GSM systems. The tone frequencies are separated by exactly half the bit rate. It has high spectral efficiency.

What is the bandwidth of MSK?

For MSK, the transmission bandwidth, which contains 99% of the total power, is less 20% higher than the bit rate , while QPSK/OQPSK has a bandwidth that is a bit more than eight times the bit rate . However, for the null-to-null bandwidth, QPSK and OQPSK are more spectrally efficient than MSK.