In WCDMA system, downlink base band modulation involves a lot of channels and complex functions, resulting in prolonged time and higher costs for test and verification.
WCDMA中下行链路基带调制信道多，功能复杂，对其测试和验证所花费的时间和费用也随之提高。
Based on the principle of digital orthogonal modulation, the generation question of wide-band signal is factually identical with how to generate base-band signal with high sampling in time domain.
在数字正交调制原理的基础上，宽带信号的产生问题实际上转换为如何得到高采样率下的时域基带信号。
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