qam modulation

-scuzzyTerminology: IT; pronunciation: eye-teeTerminology: Java ee; pronunciation: jay-two-ee-eeTerminology: Keitai; pronunciation: k-tieTerms: Kerberos; pronunciation: kerr-berr-rossTerminology: Kloc; pronunciation: kay-lockTerminology: LAN; pronunciation: LAN (rhymes with Mans)Terminology: LPAR; pronunciation: el-parTerminology: LEC; pronunciation: lehkTerminology: Linux; pronunciation: lin-nuxTerminology: LOB; pronunciation: Ell-oh-beeTerminology: lu-lu; pronunciation: Loo-looTerminology: meb

support more than 60 enterprise users or hundreds of home users who use E1/T1 at the same time. WiMAX uses a variety of advanced technologies, such as OFDM, diversity, and adaptive modulation, to achieve NLOS and block line of sight ONLOS transmission, effectively improving the efficiency of wireless transmission in the city. The physical layer supports TDD/DMTA and FDD/TDMA radio duplex multiplexing modes to meet the requirements of telecom systems

China's ADSL access technology has developed very rapidly. So I have studied the features and applications of the ADSL access technology. I would like to share with you here, hoping it will be useful to you. The maximum downlink rate of ADSL2 is 12 Mb/s due to improved frame structure and optimized RS encoding. Because ADSL2 + uses a wider spectrum, there are more than 512 sub-carriers). When the distance is short, the downlink speed can reach up to 24 Mb/s. If g.992.32.16j is used, the maximum

range of roaming and flexible mobile communication services. In the DBS system, a large amount of data is broadcasted using the High-Speed Uplink Channel of the satellite Main Station and the satellite forwarder after the frequency division or time division modulation, the user receives data through the satellite antenna and satellite Modem, and the receiving antenna is generally 0.53 m or m in diameter. Because the digital satellite system has high

The development of networks is immeasurable. With the broadband access of ADSL, every household can access the Internet at high speed. Therefore, ADSL is constantly improved to achieve higher speed and wider bandwidth. Now let's take a look at the differences between ADSL2 and ADSL2 +. Due to frame structure improvement and optimized RS encoding, ADSL2 can reach a maximum downlink rate of 12 Mb/s. because ADSL2 + uses a wider spectrum, there are more than 512 sub-carriers). When the distance is

system to the 100 Gbit/s OTN system, the following requirements must be met: 1) supports 50 GHz channel spacing; 2) dispersion (CD) margin ± 700 ps/nm; 3) polarization modulus dispersion (PMD) margin of 10 ps (DGD average value ); 4) It can be smoothly upgraded in the existing DWDM network and OTN network; 5) there is no major crosstalk cost for existing DWDM channel signals. 100 Gbit/s OTN system upgrade requirements must meet all of the above requirements, currently can through coherent detec

In the previous article, "Wintel IoT platform-windows IoT starter Guide", we explained the setup of the Windows on device hardware preparation and software development environment, as well as a presentation of the Hello Blinky project. At the beginning of this article, we enter the project practice section.Because Windows on device is designed with Galileo as the hardware platform, its peripheral interface is also compatible with the Arduino standard. In addition, the programming model also refe

. Fu Jie, WLAN product director of Huawei switches and enterprise communication lines, further pointed out that compared with the previous generation of 802.11n products, the significant performance improvement of 11ac also comes from higher modulation efficiency, channel exclusive breaking, and link efficiency improvement. For example, the traditional 802.11n standard uses 64QAM modulation technology in th

Audio, English, or you might see an audio output or input on the back panel of a VCR or VCD. This allows us to interpret the audio in a very popular way, as long as it is a sound that we can hear and transmit as an audio signal. For the physical properties of audio because it is too professional, please refer to other information. The sound in nature is very complex, the waveform is extremely complex, usually we use the Pulse code modulation coding, n

of the first is that you must establish the transmission medium electrical characteristics, usually different transmission media for different frequency segments of the signal has different processing power. Ethernet wire processing baseband signal, WAN light out of high-frequency modulation signals, mobile communications, 2G and 3G respectively need to have different carrier frequency characteristics. So these media (air, wire, fiber, etc.) for the

, and the popularization of endpoint devices also takes time.5. Cable-modem is an ultra-high-speed modem that has been used for trial in the last two years. It uses a ready-made cable TV (CATV) network for data transmission, it is already a mature technology. With the development of cable TV networks and the continuous improvement of people's quality of life, using Cable Modem to access the Internet through cable TV networks has become a high-speed access method that attracts more and more indus

(reprint) Common Audio Protocol IntroductionIntroduction and comparison of common audio protocols for conference TV white PaperFirst, the digital audio principle: The sound is actually a kind of energy wave, therefore also has the frequency and the amplitude characteristic, the frequency corresponds to the time axis, the amplitude corresponds to the level axis. Usually the ear can be heard in the frequency of 20Hz to 20KHz of sound waves known as audible, less than 20Hz to become infrasound, hig

[Concept] The PCM (Pulse Code Modulation) Audio Encoding format is also calledPulse Coding Modulation. It is to convert analog signals such as sound into a symbolic pulse column, and then store records. Principle] A continuous analog signal with continuous values is transformed into a discrete time. The Discrete digital signal is then transmitted in the channel. pulse coding

Mbps.In addition, like Dolby Digital Plus, HDMI1.3a is supported, and HD DVDs and BD are set to both mandatory and optional audio standards. Interestingly, DolbyTrueHD also features a user-friendly feature-dynamic range control (night mode ). This allows you to change the sound settings when playing the video, and reduce the peak volume level while ensuring the sound details, so as not to watch the video at night, others are influenced by big dynamic scenes.The development of Dolby TrueHD large

Introduction Audio and video are the main methods for multimedia applications to provide information to users. These audio and video data generally have a high sampling rate, and the compressed raw data has practical value, otherwise, it will not only occupy a large amount of storage space, but also have a low validity rate during playback or network transmission. Therefore, audio and video digital compression encoding is widely used in multimedia applications. This article mainly describes Audi

generally uses DMT modulation to implement digital transmission on a pair of Copper Twisted Pair wires. the downlink speed of VDSL can reach 13 ~ 52 Mbps, uplink speed up to 1.5 ~ 7 Mbps, the transmission distance is about 300 meters ~ 1.3 km. Fttx + LAN Fttb + LAN (LAN) broadband access network in fttx is the most reasonable, practical, and cost-effective broadband access method.CommunityAnd 10 MB to the building and 10 MB to the user. It provid

evaluated at least once per drx cycle in the UE-side physical layer (relative to the thresholds qout and Qin in the relevant detection ); Conclusion: UE compares the detected link quality with the decision threshold (qout and Qin) to determine that it is in the synchronous/out-of-step state. When the wireless link quality is lower than the threshold qout, the UE-side physical layer reports the out-of-sync status to the upper layer. When the wireless link quality is better than the threshold

Multi-channel lpcm: the original format of lossless audio tracks. It is equivalent to a wave file and does not require decoding. You can directly input a Power Amplifier for DA conversion. The fiber optic and coaxial interfaces can only transmit two-channel lpcm, multi-channel lpcm requires HDMI interface transmission. PCM: nonlinear pulse Coding Modulation Lpcm: linear pulse Coding Modulation They are an e

electrical characteristics of the transmission media, generally, different transmission media have different processing capabilities for signals in different frequency segments. The ethernet cable processes the baseband signal, and the wide area network light emits high-frequency modulation signals. Mobile Communication, 2G and 3G require different carrier frequencies. Can these media (air, wire, optical fiber, etc.) input at a certain frequency be b

Win7 Network connection error code 629 workaround. The method is as follows: 1, check user name and password: If your username and password input error, it is likely to cause 629 errors, we can re-enter the user name and password, enter the time to see if your key is open to enter the user name error, enter the completion of the user name, to see if there are more than a space. 2, the replacement line: Connecting the network line aging or crystal head failure may cause us to conn