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Efficiency Improvement of Delta Sigma Modulator-Based Transmitter Using Complex Delta Sigma Modulator and Noise Reduction Loop
Journal of Circuits, Systems and Computers ( IF 1.5 ) Pub Date : 2020-07-18 , DOI: 10.1142/s0218126620502679
Nasser Erfani Majd 1 , Amin Aeenmehr 1
Affiliation  

This paper proposes an architecture to enhance coding efficiency (CE) of the Delta Sigma Modulator (DSM) transmitters. In this architecture, a complex–low pass delta sigma modulator (LPDSM) is used instead of existing Cartesian–LPDSM and polar–low pass envelope delta sigma modulator (LPEDSM). Simulation results show that for Uplink long-term evolution (LTE) signal with 1.92[Formula: see text]MHz bandwidth and 7.8-dB peak to average power ratio (PAPR), the CE for the complex–LPDSM-based transmitter is equal to 41.7% in compare to 9.7% CE for Cartesian–LPDSM transmitter. Also, due to the resolving of noise convolution problem, the complex–LPDSM-based transmitter baseband part needs lower oversampling ratio (OSR) and clock speed than polar–LPEDSM transmitter baseband part to achieve the same signal-to-noise and distortion ratio (SNDR). In the next step, a quantization noise reduction loop is implemented in this architecture. By using this technique for an Uplink LTE signal with 1.92[Formula: see text]MHz bandwidth, with the same PAPR and OSR of 16, the CE is improved from 41.7% to 56.1% with 40[Formula: see text]dB SNDR.

中文翻译:

使用复杂的 Delta Sigma 调制器和降噪环路提高基于 Delta Sigma 调制器的发射机的效率

本文提出了一种提高 Delta Sigma 调制器 (DSM) 发射器的编码效率 (CE) 的架构。在此架构中,使用复数低通 delta sigma 调制器 (LPDSM) 代替现有的笛卡尔-LPDSM 和极性低通包络 delta sigma 调制器 (LPEDSM)。仿真结果表明,对于具有 1.92[公式:见正文]MHz 带宽和 7.8-dB 峰均功率比 (PAPR) 的上行链路长期演进 (LTE) 信号,基于复数 LPDSM 的发射机的 CE 等于与笛卡尔-LPDSM 发射器的 9.7% CE 相比,为 41.7%。此外,由于解决了噪声卷积问题,基于复数 LPDSM 的发射机基带部分需要比极性-LPEDSM 发射机基带部分更低的过采样率 (OSR) 和时钟速度,以实现相同的信噪比和失真比。 SNDR)。下一步,在该架构中实现量化降噪循环。通过将这种技术用于具有 1.92[公式:参见文本]MHz 带宽的上行链路 LTE 信号,在相同的 PAPR 和 OSR 为 16 的情况下,CE 从 41.7% 提高到 56.1%,具有 40[公式:参见文本]d​​B SNDR。
更新日期:2020-07-18
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