Data transmission device
专利汇可以提供Data transmission device专利检索，专利查询，专利分析的服务。并且PURPOSE: To raise an improvement factor of an error rate from hard decision Viterbi decoding and an improvement factor from Viterbi decoding by executing soft decision Viterbi decoding by utilizing a fact that it is possible to have a soft decision value as decoding data, when differential coding is performed before a GMSK (or MSK) modulation.
CONSTITUTION: When data from a voice CODEC, etc., of a transmitting side is received, a data interface 1 sends it to a convolution encoder 2 and performs convolutional encoding. This data is brought into differential encoding by a differential encoder 3, and a signal modulated by a GMSK modulator is radiated as a radio wave from a transmitting antenna 5. A detecting signal which passes through a receiving antenna 6 and an orthogonal detector 7 outputs a same phase component 8 and an orthogonal component 9. A DFE 10 outputs a soft decision value 11 from the detecting signal. A bit clock reproducing device 17 reproduces a clock from a receiving signal, and outputs it to a bit coefficient generator 12. The generator 12 outputs a bit coefficient 13, based on information from the reproducing device 17. By multiplying the coefficient 13 and the decision value 11, soft decision decoding data 14 is obtained.
COPYRIGHT: (C)1990,JPO&Japio，下面是Data transmission device专利的具体信息内容。
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