TFM是一种相关相移键控信号。
虚拟无线电技术正在不断的蓬勃发展，该文提出了一种基于虚拟无线电思想的二进制差分相移键控信号软件解调算法。
The technology of virtual radio is developing rapidly, a new DPSK signal software demodulation algorithm is proposed based on virtual radio.
传输信号采用正交相移键控调制方式，以有效利用有限通信带宽。
Quadrature phase shift keying(QPSK) signaling is employed to make efficient use of the available bandwidth.
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