dqpsk modulation

bandwidth--greater bandwidth allows for more information to be sent in a shorter period of time. Another wireless technology with 250kbps bandwidth, for example, needs to be turned on for 8 times times longer to send the same information (consumes more battery power).Bluetooth Low energy Technology "complete" a single connection (that is, scanning other devices, establishing links, sending data, authenticating and ending appropriately) is only 3ms. Standard Bluetooth technology requires hundred

is directly output to the multipleer without the video server. C. Video Server The video server uses a large array disk to store audio and video streaming files, effectively manage the program editing process and material library, prepare program series orders, and broadcast multiple programs through the broadcast control platform. 　　　　 D. DTS The multi-channel MPEG-2 data transmission stream (SP, single-program TS) from the video server and real-time Encoding Equipment is reused as one-way t

operator is different, but the function is the same. Its main content is that the operator provides the classification and system settings of the business (Program) and some auxiliary functions. These contents constitute the top menu of the page, and the next menu is usually composedSiGeneratedEPG. In the main menu, the system is set to enable the receiver to receive messages quickly and accurately.DVBThe program has three basic operations: information detection, program search, and software d

With the development of digital signal processing technology, more and more electronic products are using digital audio technology. Digital audio interfaces have become a trend of development. The ECM and MEMS digital microphones using pulse density modulation (PDM) interfaces are also born. Currently, ECM and MEMS digital microphones have become the mainstream for portable laptop sound pickup devices. Digital ECM or MEMS microphones have irreplaceabl

(high power consumption) L self-interference system-mutual interference between users in the system, difficult technical implementation 3: What is the voice encoding used by TD? A: Amr (Adaptive multi-rate) has eight types of codes. 4: In the TD system, which code is used to differentiate users and communities? A: differentiate users: Spread spectrum codes. The spread spectrum codes used by TD are OVSF codes. L The uplink spread spectrum factor used by the TD-SCDMA is 1/2/4/8/16, with the beha

the system file in windows to the VC ++ project directory, and then include the file matlib. h and the linked file v1_1.lib in the program. After the installation of matcom, the refguide.pdf file is automatically generated on the installation terminal. the functions listed in the file can be directly used in VC ++.2. Use MATLAB mathematical functions and Toolbox FunctionsAfter completing the above steps, you can use MATCOM to convert the M file of the required function to a CPP file or DLL file

Because the chip used to participate in the computer mouse is the stm32 series, coupled with relatively tight time, we basically learn while doing the module. I encountered a lot of difficulties, but I still felt that I had learned a lot and wanted to share it with me .. Okay, let's just talk about it. Pulse Width Modulation (PWM), short for "Pulse Width Modulation, it is a very effective technology that us

venues. This is especially suitable for future application in Olympic Games, wiMAX features shorter deployment cycles and greater flexibility than DSL or Cable access. Point-to-Point Wireless Broadband Access Point-to-Point wireless broadband access is mainly used for point-to-point wireless backhaul and relay services. Point-to-Point wireless broadband access not only greatly extends the WiMAX network coverage, but also provides wireless relay transmission for the carrier's 2G/3G network base

Said it is the type of machine, from a few days to use the experience and find the point of information!Actually listen down, this machine's amplitude modulation part does have "enhance" the place, mainly in the sensitivity, through and several one-time variable frequency pointer machine and digital display comparison, indeed has the promotion, especially uses the tie rod antenna, has approached the BCL machine level, let me to its interest greatly in

existing communication technologies from a relatively high level and system perspective, and analyzed many seemingly completely unrelated technologies in a unified mathematical expression, in particular, the popular technologies such as MIMO, Opportunistic Communication, OFDM, and multi-user Communication have been interpreted from the viewpoint of information theory, this is helpful for us to grasp the current development direction of wireless communication at a higher level. We strongly recom

Reprinted: http://blog.chinaunix.net/uid-22028680-id-3208043.html 1. The channel is locked by the input frequency, symbol rate, and modulation method.2. Receive the Pat table on the current channel. If it is known that the PID of Pat is fixed to 0, the Pat table will be parsed and saved.3. Obtain the NIT table pid from pat:If program_number is 0, network_pid is obtained. Of course, the NIT table PID is fixed as 0x0010 is also a solution, but this sol

V. Modem Glossary 　　 At command (atcommands): a modem command language invented by Hayes, which is now a de facto standard and used by all modem manufacturers. The name of each command starts with the letter ". At is followed by letters and numbers to indicate specific functions. For example, "atdt" is a dialing command, other Commands include "initialize the modem", "control the speaker volume", "specify the number of calls for the modem to initiate a response", and "select the error correctio

construction include class style, functional requirements for value-based Student Management, class honors, student works, student centers, etc. Xinyi aojiashi Electronics Co., Ltd. was established in 2012. It specializes in the production of Cable Digital TV front-end products and undertakes cable TV iptv system smart interactive TV solution design and digital TV transformation project.I. okasi digital TV front-end products include the following four categories:1. Analog Front-end: modulated d

Mbps or above, and the downlink speed is higher. Cable modem is a dedicated MODEM that integrates MODEM functions, bridging encryption and decryption functions, Nic and Ethernet Hub functions. It does not require dial-up access, does not occupy telephone lines, and can be connected permanently. Data signals are transmitted to users' homes through fiber-optic coaxial hybrid network (HFCs). cable modem completes signal decoding, demodulation, and other functions, and transmits digital signals to

network data through FM radio frequency modulation signals at idle time. "It can monitor network conditions, and choose to transmit data with FM during idle hours to bypass other people's network lines to avoid Back-Off," said Marcel Flores, a doctoral researcher ." The team transmits wireless network signals through commercial FM radio frequency modulation signals. The frequency ranges from 87.5Mhz ~ Betw

Wireless Internet access can be achieved in a variety of ways, such as surfing on the wireless network. Next, we will give a brief introduction to EDGE wireless Internet access, and make a rough comparison with the appropriate user groups based on the characteristics of each method. Hope to help you. What is EDGE? EDGE is short for Enhanced Data Rate for GSM Evolution, that is, Enhanced Data Rate GSM Evolution technology. EDGE is a transitional technology from GSM to 3G. It mainly uses a new

meet different coverage environments and planning requirements, you can flexibly choose wireless resource blocks and modulation encoding methods used by users. In the actual network, the number of wireless resource blocks, user rate, modulation and encoding methods, and signal-to-noise ratio of the business are mutually affected, resulting in complicated 4G network scheduling algorithms, during the plannin

modulation, multiple access technology and receiver fields. In the field of coding and modulation, we will focus on Nonlinear Multi-user pre-encoding, new combined modulation coding, network coding and other technologies. In the field of multi-access technology, we focus on non-orthogonal multi-access technology. In the receiver field, the key research can suppo

wide instantaneous bandwidth while ensuring efficient mirror-frequency rejection and minimizing lo leakage. Mirror frequency rejection and lo leakage performance can be achieved with wideband quadrature correction, the receiver path is optimized and can be used as a vector signal analyzer for wideband demodulationLow if mode and in-band re-adjustmentThe low if receiver is another type of receiver using the IQ demodulator with the same block diagram as the 0 if receiver shown in Figure 5. In a 0

Deep Learning Study Notes:Deep Learning 21: Depth learning attempt for modulation signal classification 3Deep learning 20: Depth learning attempt for modulation signal classification 2_CNNDeep learning 19_ Depth Learning UFLDL Tutorial: convolutional neural network_exercise (Stanford University Deep Learning tutorial)Deep learning 18:DBM's study and practice _ reading paper "Deep Boltzmann Machines" notesDe