# Phần mềm xác định radio P5

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## Phần mềm xác định radio P5

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When the concepts of ‘pure’ software radio 1 were ﬁrst introduced they were immediately recognizable to those who had worked on military systems at very low frequencies – at a carrier frequency of 16 kHz, A/D conversion of the RF carrier directly at the antenna was becoming feasible in the 1970s. However, only 10 years ago the prospect of ‘pure’ software radio implementations for commercial wireless systems, operating at carrier frequencies of 2 GHz and beyond, was seen as being decades away....

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