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在CDMA系统中分配给各个用户的扩频码如果没有严格正交,将会引起用户之间的相互干扰,即多址干扰。随着用户数的增多,多址干扰的增强,用户的误码性能会变差。另一方面,移动用户的位置不断变化及深度衰落的存在,强功率用户的信号会抑制弱功率用户的信号,系统性能严重弱化,即所谓的远近效应,因此抑制MAI和远近效应以提高系统的性能,增加容量是十分迫切的要求,而多用户检测技术成为近年来的主要解决方法之一。
多...[Details]
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Recently, Wuhan City issued the "Several Policies of Wuhan City to Accelerate the High-Quality Development of the Integrated Circuit Industry" (hereinafter referred to as "Several Policies"), and lau...[Details]
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Electromagnetic flowmeter is a mainstream flow meter on the market. According to different needs and installation methods, electromagnetic flowmeter can be divided into integrated electromagnetic flo...[Details]
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Question 18-1: You can analyze signals without an oscilloscope, and the analysis function and interface are the same as those of a real oscilloscope. The prerequisite is that you have the waveform dat...[Details]
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In the previous article "Qemu builds ARM vexpress development environment (II) ---- Start the Linux kernel through u-boot", it has been realized to load the kernel through u-boot to start the develop...[Details]
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Today, Lu Qianhao, director of ZTE's mobile phone strategic development department, talked about the situation of ZTE's new domestic operating system, ZTE's new fulcrum OS. He said: "ZTE's new fulcru...[Details]
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What is an interrupt? In the processor, the so-called interrupt is a process, that is, when the CPU is executing a program, it encounters an external/internal emergency event that needs to be handled...[Details]
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On April 9, GAC TECH DAY 2021 with the theme of "Leading the Low-carbon Future with Intelligence" was held at GAC Research Institute. GAC Group released the "Neutron Star Strategy", a power bat...[Details]
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Read protection When the ROP byte in the option bytes is programmed to '0xAA', the read protection is enabled. In this case, reading or modifying the FLASH program memory and DATA area in ICP mode (u...[Details]
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The inverter market holds huge business opportunities, but there are not many companies that can truly make a difference in the photovoltaic segment. Guangzhou Sanjing Electric Co., Ltd. (Sanjing Elec...[Details]
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EL (Electroluminescence) is an electroluminescent material. In terms of structure, the electroluminescent material is sandwiched between two electrodes. Its upper electrode is a transparent conduct...[Details]
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Lithium-ion batteries have gradually become a common technology for portable applications using rechargeable batteries due to their advantages such as high energy density, high voltage, low self-di...[Details]
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On March 25, Microsoft proposed a new method in a recently approved patent to reduce video memory usage through SSD solid-state drives, thereby providing ray tracing performance for games in future...[Details]
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SolarBridge Technologies has received a $2.3 million grant from the U.S. Department of Energy (DoE) to develop low-cost solar photovoltaic microinverters.
SolarBridge said it will use the gran...[Details]
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In the last EV Focus column, we talked about why electric vehicles need to use 800V, and also roughly understood the relationship between SiC and 800V. In this issue, we will zoom in and talk about...[Details]