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[Communication-Mobile] COST259 DL : 0: COST channel simulation
Date : 2025-12-25 Size : 299kb User : liu
[Communication-Mobile] 51wuxian DL : 0: 51无线传输，支持无线串口的发射和接收，成本低，易懂-51 wireless transmission, wireless serial port transmitter and receiver, low cost, easy to understand
Date : 2025-12-25 Size : 9kb User : 霍殿中
[Communication-Mobile] FirstFollow DL : 0: Multiple input multiple output techniques combined with orthogonal frequency division multiplexing (MIMO-OFDM) provide a promising approach for wireless systems. However, a serious drawback of the OFDM system is the high peak-toaverage power ratio (PAPR), which may severely affect the power efficiency of RF power amplifiers. In this paper, we propose a simple method to reduce the PAPR of MIMO-OFDM signals based on the use of unused subcarriers. Instead of processing the signals at each transmitter separately, a peak cancelling signal is generated at one antenna and is then applied to all the others with only simple modifications. Simulation has shown that a minimum 2 dB reduction in PAPR can be achieved for all transmit signals using this approach. As the signal processing is nearly all done at a single transmitter, repetition of the operations at each transmitter is avoided, and therefore the overall cost of the system can be significantly reduced.
Date : 2025-12-25 Size : 5kb User : payal
[Communication-Mobile] SerialPortCommunication_VBNet2 DL : 0: The serial (COM) port is one of the simplest ways to communicate between a PC and a microcontroller circuit. Most microcontrollers have hardware serial ports and most microcontroller compilers have built-in functions to read from and write to the hardware port. Hardware serial ports with their 9-pin D connectors have disappeared from laptop and desktop computers, but are easily produced with a low-cost USB-to-serial cable adaptor. For embedded systems, a common approach is to add a FT232R USB-to-serial chip to the circuit so that the hardware connects to the PC though USB. Another option is to add a USB-to-serial module, for example the UM232R by FTDI or the USBMOD3 from DLP Design. These modules add glue circuits and a USB connector to the converter chip for an easy-to-use self contained solution.
Date : 2025-12-25 Size : 230kb User : dang minh thanh
[Communication-Mobile] esp_iot_sdk_v1.5.0_15_11_27 DL : 0: 本资料是现在性价比较高的ESP8266的WiFi模块的固件资料，功能强悍，而且便宜，适合初学者。-This information is now cost-effective WiFi ESP8266 module of the firmware information, powerful, and cheap, suitable for beginners.
Date : 2025-12-25 Size : 2.08mb User : fff
[Communication-Mobile] 2、基于BasicRF的数据传输(一对多) DL : 0: 基于ZigBee的无线通信协议传输数据，主要是由协调器、路由器、终端进行连接，低功耗，成本低(ZigBee based wireless communication protocol transmission data, mainly by the coordinator, router, terminal connection, low power consumption, low cost)
Date : 2025-12-25 Size : 5.83mb User : 李升