而在实际应用中，由于器件工艺和电路设计结构的非理想性，两支路间必然会存在不匹配现象。
In practical applications, due to impairment of the device and the circuit design structure, it is difficulty to achieve the accurate gain and phase matching required between the two paths.
但是射频器件的非理想特性将导致信道互易性的丧失，使TDD系统的优势无法发挥。
But radio frequency (rf) front-end imperfections can lead to the loss of channel reciprocity, which will invalidate the advantage of TDD systems.
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