采用3电平非均匀量化的脉冲编码策略

Pulse encoding strategy using 3-level non-uniform quantizing

作为全数字发信机系统中广泛应用的一种脉冲编码技术,Delta-Sigma调制(Delta-Sigma Modulation,DSM)通过增加量化电平,能够实现调制性能的提升。但限于全数字发信机系统开关功放的具体结构,多电平DSM序列无法直接驱动后级功放电路。在传统3电平DSM基础上,通过引入面积等效原理和非均匀量化技术,提出了适用于开关功放的一种新的脉冲编码策略。理论分析和仿真结果表明,相比常规2电平DSM序列,采用该策略获得的调制脉冲序列具有更优的带内SNR和编码效率性能。

As a widely used pulse encoding technique in the full-digital transmitter,the DSM(Delta-Sigma modulation)can obtain a better performance by increasing the quantizer’s levels.But the multi-level DSM output cannot drive the switching amplifier directly due to the structural restriction of switching amplifier in full-digital transmitter.By using the area equivalent theory and non-uniform quantizing technique,a novel pulse encoding strategy for switching amplifier was proposed and analyzed.The theoretical analysis and simulation results reveal that the pulse output created by the novel pulse encoding strategy gives rise to a much better in-band SNR(signal noise ratio)and coding efficiency performance compared to the traditional 2-level output.