DPD带宽限制对28nm WLAN 802.11ac发射机EVM的影响

2017 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC) Pub Date : 2017-10-01 DOI:10.1109/NORCHIP.2017.8124943

Oscar Morales Chacon, T. Johansson, Thomas Flink

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引用次数: 0

摘要

分析了采用256QAM调制、带宽分别为20mhz和80mhz的28nm CMOS的IEEE 802.11ac无线局域网发射机在不同带宽限制下的数字预失真性能。由于发射机链中的带宽限制条件，DPD线性化性能可能会降低。对于256QAM调制，最小发射机误差矢量幅度(EVM)要求为- 32 dB(2.5%)，使用模拟和测量结果估计，由于发射机链中的带宽限制，最大线性输出功率减少1.6 dB。

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The effect of DPD bandwidth limitation on EVM for a 28 nm WLAN 802.11ac transmitter

Digital predistortion (DPD) performance for an IEEE 802.11ac WLAN transmitter in 28 nm CMOS, using 20 and 80 MHz bandwidth with 256QAM modulation, is analyzed under different bandwidth limitations. Due to band-limited conditions in the transmitter chain, the DPD linearization performance may be reduced. For a minimum transmitter error vector magnitude (EVM) requirement of −32 dB (2.5%) for 256QAM modulation, a reduction in the maximum linear output power of 1.6 dB due to bandwidth limitations in the transmitter chain is estimated using simulations and measurement results.

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2017 IEEE Nordic Circuits and Systems Conference (NORCAS): NORCHIP and International Symposium of System-on-Chip (SoC)

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