ofdm modulation

MCS (modulation and Coding scheme, modulation and encoding strategy)The configuration of the 802.11n RF rate is achieved through the MCS index values. The MCS modulation encoding table is a representation of the 802.11n to characterize the communication rate of the WLAN. MCS takes the factors that affect the communication rate as columns of the table, and the MCS

This article transfers from the text/ Shing original reprint please indicate the source http://blog.csdn.net/yxstars/article/details/ 380799 Depending on the way the signal is sent and received, Iso/iec14443-3 defines the TypeA, typeb two card types. They differ mainly in the modulation depth of the carrier and the encoding of the binary number. When transmitting a signal from a read-write implement to a card, the two transmit the signal via a

spectral width. The average radial velocity is usually obtained by averaging dozens of pairs of pulses.8.1.4 Maximum non-fuzzy distance and distance foldingDistance folding: Refers to a radar to produce a radar echo of the target object of a recognition error. When the target is located outside the maximum non-fuzzy distance rmax, the radar shows the target in a position within the Rmax, which is called "distance folding" vividly.When a distance collapse occurs, the position of the echo shown b

technical characteristics of BluetoothTo put it simply, Bluetooth is a short-range wideband radio technology that is the global open standard for voice and data wireless transmission. It uses advanced techniques such as frequency hopping spread spectrum (FHSS), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA) and so on to establish the information transmission between various communication and information systems in a small scope.1, the main technical characteristics o

represented by 5-bit encoding, this 5-bit encoding is called the code group, and is transmitted by NRZI mode.The 4B/5B encoding is an information encoding scheme used in the optical Distributed Data Interface (Fddi,fiber distributed-Interface) of the Gigabit Fast Ethernet. This encoding is characterized by the data stream to be sent every 4bit as a group, each four-bit binary code is represented by 5-bit encoding, this 5-bit encoding is called the code group, and is transmitted by NRZI mode.In

-contact displacement measurement.According to the principle of measurement, laser displacement sensor principle is divided into laser triangulation method and laser Echo analysis method, laser triangulation method is generally suitable for high-precision, short-distance measurement, and the principle of laser echo analysis is used for long-distance measurement.3 Measurement Method One: phase-type Laser rangingPhase Laser rangefinder is the frequency of radio waves, the amplitude

scheme used in the optical Distributed Data Interface (Fddi,fiber distributed-Interface) of the Gigabit Fast Ethernet. This encoding is characterized by the data stream to be sent every 4bit as a group, each four-bit binary code is represented by 5-bit encoding, this 5-bit encoding is called the code group, and is transmitted by NRZI mode.In the communication system, the communication speed and the modulation rate in the transmission line, the so-cal

PCM Definition PCM Chinese called pulse code modulation, composed of. rivers proposed in 1937 that this concept laid the foundation for digital communication. In 1960s, it began to be applied to the local telephone network to expand the capacity, so that the transmission capacity of most existing audio cable core lines was increased by 24 ~ 48 times. By the middle and end of 1970s, various countries have successfully modulated pulse codes for large a

1. Introduction The purpose of this article is to provide a guided technical overview of Lora and LoRaWAN technologies. Low-Power wide area network (Lpwan) supports the vast majority of IoT devices that are expected to be hundreds of millions of orders of magnitude. LoRaWAN optimizes the battery life, capacity, range, and overhead of Lpwan in a bottom-up manner at design time. This paper gives an overview of the LoRaWAN norms in different regions, and compares several competing technologies in

wireless phones, mobile phones, and other devices. They can send and receive radio waves, convert 1 s and 0 s to radio waves, and convert the radio waves back to 1 s and 0 s. However, there are some notable differences between wireless network radio and other radio: They send signals at a frequency of 2 to 4 GHz or 5 GHz. This frequency is much higher than that of mobile phones, phones, and TVs. The higher the frequency, the more data the signal carries. They use the 802.11 Network standard and

In terms of transmission rate, 802.11n can increase the transmission rate of WLAN from 54 Mbps provided by 802.11a and 802.11g to 600 Mbps or even up to Mbps. The mimo ofdm technology applied in combination with the multi-input and multi-output MIMO) and OFDM orthogonal frequency division multiplexing technology improves the wireless transmission quality and transmission rate. The existing 802.11n Wireless

placed here. * Bmt. lib (+ RO); the executable code and constants of all files ending with bmt. lib are placed here. * Adaptation. lib (+ RO) * Config. lib (+ RO) * Custom. lib (+ RO) * Drv. lib (+ RO) * OFDM. lib (+ RO) * Init. lib (+ RO) * Kal. lib (+ RO) * Lw.classb.lib (+ RO) * Nucleus us. lib (+ RO) * Nucleus us_int.lib (+ RO) * Nucleus us_debug.lib (+ RO) * Stacklib. lib (+ RO) * Sst. lib (+ RO) * Tst. lib (+ RO)

, that is, the number of spaces occupied by the tab key, help tabstop 03 set sw = 4 "sets shiftwidth, that is,> how many spaces are moved at a time ,: help shiftwidth 04 set cindent "C language Smart indent 05 set textwidth = 80" set a line of character width 06 set comments = sl:/*, mb: **, elx: * "automatically complete annotation symbol 07 filetype plugin indent on" enable automatic file type detection 08 set completeopt = longest, menu "set word auto-completion option 09 set autoindent" set

triangle side is 42 cm, and the arm length is 36 cm, so we don't need to consider the shrinking problem. The length of the inner side of the square is = √ (30*30/2) = 21.21 cm, now you can directly use the Dishes served by others. Height in kossel design has always been a headache, because the rocker is wasting a lot of height, and the rocker is shrinking when it is short. In the mini version, the bottom of the frame is too small, increasing the height is obviously unstable. Now the max height