目前Wi-Fi信号几乎存在于人们日常生活中的方方面面,人群密集区也成为了Wi-Fi流量的密集区,如要在WiFi流量密集的区域接收Wi-Fi频段内的其他信号,就需要设法消除Wi-Fi信号对它的干扰。通过分析Wi-Fi协议,提出了一种利用Wi-Fi协议MAC层CT...目前Wi-Fi信号几乎存在于人们日常生活中的方方面面,人群密集区也成为了Wi-Fi流量的密集区,如要在WiFi流量密集的区域接收Wi-Fi频段内的其他信号,就需要设法消除Wi-Fi信号对它的干扰。通过分析Wi-Fi协议,提出了一种利用Wi-Fi协议MAC层CTS控制帧的Wi-Fi信道流量短时抑制方案,并分析了其性能指标,该方案具有保密性好、操作性强的优势。实验结果表明,该方案可以将指定信道的Wi-Fi功率降低20 d B以上,实现了短时Wi-Fi信道流量抑制的功能。展开更多
This paper demonstrates the design and fabrication of a monolithic HBT power amplifier for TD-SCDMA cellu- lar phones that achieves high efficiency and linearity. The two-stage MMIC integrates the input matching circu...This paper demonstrates the design and fabrication of a monolithic HBT power amplifier for TD-SCDMA cellu- lar phones that achieves high efficiency and linearity. The two-stage MMIC integrates the input matching circuits,interstage matching circuits, and active bias circuits in a single chip with size as small as 0.91mm × 0.98mm. The amplifier obtains a power-added efficiency of 43% （15%） and a gain of 28.5dB （24dB） at the high and low operation mode under the 3.4V supply. In addition, the adjacent channel leakage power is below - 45dBc/- 56dBc and - 39dBc/- 50dBc at 1.6MHz/3.2MHz offset in low and high power output modes, respectively, with QPSK modulation. The MMIC offers the potential for low cost production due to small chip size, stable voltage supply, and high performance at the same time.展开更多
文摘目前Wi-Fi信号几乎存在于人们日常生活中的方方面面,人群密集区也成为了Wi-Fi流量的密集区,如要在WiFi流量密集的区域接收Wi-Fi频段内的其他信号,就需要设法消除Wi-Fi信号对它的干扰。通过分析Wi-Fi协议,提出了一种利用Wi-Fi协议MAC层CTS控制帧的Wi-Fi信道流量短时抑制方案,并分析了其性能指标,该方案具有保密性好、操作性强的优势。实验结果表明,该方案可以将指定信道的Wi-Fi功率降低20 d B以上,实现了短时Wi-Fi信道流量抑制的功能。
文摘This paper demonstrates the design and fabrication of a monolithic HBT power amplifier for TD-SCDMA cellu- lar phones that achieves high efficiency and linearity. The two-stage MMIC integrates the input matching circuits,interstage matching circuits, and active bias circuits in a single chip with size as small as 0.91mm × 0.98mm. The amplifier obtains a power-added efficiency of 43% （15%） and a gain of 28.5dB （24dB） at the high and low operation mode under the 3.4V supply. In addition, the adjacent channel leakage power is below - 45dBc/- 56dBc and - 39dBc/- 50dBc at 1.6MHz/3.2MHz offset in low and high power output modes, respectively, with QPSK modulation. The MMIC offers the potential for low cost production due to small chip size, stable voltage supply, and high performance at the same time.
