qpsk modulation

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

Basic Process non-static methods Get byte code (FINDCLASS)Get Method (Getmethodid)Instantiation of the Class (Allocobject)Call Method (Callintmethod) static Method Get byte code (FINDCLASS)Get Method (Getstaticmethodid)static method of calling method (Callstaticvoidmethod) non-static method C code addint (int a, int b) method in Java class Java code: public int AddInt (int a, int b) { int c = + b; Toast.maketext (Mainapplication.getcontext (), "calculated result::" +c, Toast

a string, such as the key in the following code that describes the names of the chapters in the course "Communication basics" with a more meaningful string, which is an associative array:$chapter = Array (' Chapter One ' => ' Communication system Overview ',' Chapter II ' => ' communication protocol ',' The third chapter ' => ' Transmission technology ',' Fourth chapter ' => ' modulation mode ');Here is the code to output the two types of arrays, thi

HSDPA and HSUPA are now regarded as the evolution direction of WCDMA. The new modulation coding method in HSDPA will greatly improve the user data rate and throughput, which means that the spectral efficiency is enhanced. At the same time, users can get faster connection speeds. Therefore, from the operator's point of view, if compared with the existing 3G technology, HSDPA can be on the same wireless carrier service more high-speed users. Compared

, to meet the needs of data communication, has a strong application value. 1 Ethernet-based laser wireless communication system The combination of Ethernet and laser wireless communication can give full play to the advantages of the two systems and improve the application range and reliability of the system greatly. Fig. 1 is a schematic diagram based on one end of the Ethernet laser wireless communication system, and the other end of the structure and the end of the symmetrical state. From

level AD8370 cascade, in order to make the system work stably, the design should be 2 levels of magnification as close as possible to avoid saturation at the 2nd level, so in the adjustment of multiples into the AD8370 control word, you need to pay special attention.Figure 3 Hardware Test BoardThe system is generated by the microwave signal source 4438C, if the frequency of 4 Mbps QPSK signal, the sampling clock of 8 MHz, by the front-end if part of

the tuning demodulator constitutes a different digital set-top box, for example, the satellite set-top box (dvb-s) for QPSK demodulation, A wired digital set-top box (dvb-c) for QAM demodulation and a terrestrial transmission digital set-top box (DVB-T) for OFDM demodulation. At present, the market is more popular tuning demodulator manufacturers have Thomson, Sharp, and so on, although some manufacturers in the domestic production of tuning demodula

In response to the ever-increasing number of smart devices, applications, and data, wireless networks are evolving rapidly, and the IEEE 802.11ad standard (also known as Wiig) will help. In the past 10 years, we have seen the evolution of 802.11, while Wiig is a step change that adds a new 60 GHz band to existing products: 802.11n operates in the 2.4 GHz and 5 GHz frequencies, while the new 802.11ac product operates in the 5 GHz frequencies. By using three-frequency products (for example, 802.11

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