Thanks very much, Steve. One more question, Subcarrier spacing in OFDM is 75Hz like FDMDV? How to reduce subcarrier spacing in OFDM modem?
Vào Th 3, 13 thg 11, 2018 vào lúc 11:46 Steve <coupaydevi...@gmail.com> đã viết: > I think it's about 1 kHz every 17 carriers. > The telephone only has about 4 kHz to work with, so 1.5 kHz or so per > direction. > You'd probably have to increase the size of the constellation, say > 8PSK instead of 4PSK. > > Probably a full duplex 32 QAM design (1 carrier per direction), > without the equalization training. > > Way over my head though... > > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > -- *Kiều Việt Đích* *Công ty 129 - Ban cơ yếu chính phủ* Email : dich...@gmail.com SĐT : 0904736189
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