Abstract
How to improve spectral efficiency is one of the hot research topics in communication technology. UNB (Ultra Narrow Band), as a kind of modulation method that can improve spectral efficiency, has been advancing in a lot of disputation. EBPSK (Extended-BPSK) has been developed as an UNB modulation format and MEBPSK (Multi-Extended-BPSK) is also used to enhance the spectral efficiency. The details of frequency domain characteristics of MEBPSK will be investigated in this article. First, base band pulse coding is given; then, PSD expression for MEBPSK is deduced, and computer simulations are conducted with different modulation parameters, which shows that the theoretical results and simulation results are consistent. Finally, the bandwidth occupation and bandwidth efficiency of MEBPSK are analyzed according to different bandwidth definitions, a comparison is made between MEBPSK and EBPSK under the same conditions and, by analysis and experiment, it is shown that bandwidth efficiency of MEBPSK can be log2N times that of EBPSK according to-60dB definition, N is the integer power of 2, which obviously improves the data rates greatly under the same condition.
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