ofdm modulation

usage would be confusing. Mute to (temporarily) force volume to is zero, independently from the usual volume controls. Pcm Pulse Code modulation, the most common low-level encoding of digital audio. The audio signal is sampled at a regular interval, called the sample rate, and then quantized to discrete values within a Particular range depending on the bit depth. For example, for 16-bit PCM, the sample values is integers between-32768 and

, it is quite far from the high-definition digital TV.High Definition Digital TV (HDTV) is the future development direction. By now, all analog TVs have been eliminated, and TV Station shooting, recording, and editing devices have also been replaced, what people will see on TV screens will be high-definition TV pictures and more functions. HDTV will bring TV into a new era.Someone asked if the current digital set-top box receives a high-definition digital TV signal? No. After a digital set-top b

each sub-frame. Each sub-frame can be considered to consist of a control domain and a data field, and the downstream L1/L2 control signaling belongs to the control domain. To simplify the design complexity, the control domain consists of an integer number of characters, usually 1, 2, or 3 OFDM characters (for narrower cell bandwidth, such as a bandwidth consisting of 10 or fewer resource blocks, the control area requires 2, 3, or 4

means that the carrier frequency is changed according to a certain pattern (sequence) within a very wide band. Information Data D enters Carrier Modulation after it is modulated into a baseband signal with BD bandwidth. The carrier frequency is controlled by the pseudo-random code generator and is randomly changed in the bandwidth BSS (BSS> BD) band, the bandwidth of the baseband signal BD is extended to the bandwidth BSS used for transmitting signal

power and average power in the entire burst range at low, medium, and high frequency points. The specifications require that the peak power and average power be smaller than 23dbm and 20dbm respectively and meetThe following requirements: If the EUT power level is 1, the average power>0 dBm; if the power level of EUT is 2,-6dbm (2) power density The initial state is the same as (1). the tester finds the highest-power frequency point within the MHz band by scanning the frequency point, and then

supports multiple European languages and hybrid display of simple images and texts. Chapter 2 Composition of the DVB System[This article does not describe the hardware structure of the DVB system in detail, but explains in detail the format and Reuse Principle of the TS code stream according to the description in iso13818. (Enough, Enough)]Classification of DVBAccording to the application of different DVB, mainly divided into DVB-S, DVB-C, DVB-T, DVB-H and other specifications. Different Specif

HSPA is a new feature introduced by WCDMA R5. It uses high-order modulation of 16QAM and multi-Code Time Division Technology, greatly improving the packet transmission rate. High-order modulation: Higher-Order modulation can make transmission more efficient, but higher-order modulation also requires greater power and h

Broadband access technology is still quite common, so I have studied the two new broadband access technologies that are currently emerging. I would like to share them with you here and hope they will be useful to you. In the past decade, two new modulation and demodulation technologies, Cable Modem and ADSL Asymmetric Digital user line, have emerged. Cable Modem implements data transmission up to 10 mbH/s on a hybrid optical fiber/coaxial network (HFC

With the continuous development of the Communication Industry, broadband access technology is constantly being innovated. Here we will introduce two new access technologies and make a detailed comparison, I believe that the access industry will develop better in the future. In the past decade, two new modulation and demodulation technologies, Cable Modem and ADSL Asymmetric Digital user line, have emerged. Cable Modem implements data transmission up t

radio technology, you can use an average power less than 1 MW to cover a few miles, or even use a low-gain antenna. It is particularly valuable that it has low Interference Characteristics and strong multi-path interference resistance to other wireless systems. It is easier to implement than to build a common spread spectrum system, with a low cost. It is precisely because of the above features that the UWB communication technology has been widely used in personal communication, intra-building

RFID (Radio Frequency identification): A tutorialcontents: Introduction to Radio Frequency Identification-rfid What is RFID Compare RFID with Bar Code technology Benefits of RFID Disadvantages of RFID Active and Passive RFID Systems RFID Frequencies Operation of RFID Systems RFID Building Blocks RFID Tag block schematic, and operation Backscatter modulation RFID Standa

Pulse width modulation (PWM) is the abbreviation of English "Pulse width modulation", referred to as pulse width modulation. It is a very effective technology to control analog circuits by using digital output of microprocessor, which is widely used in many fields such as measurement, communication, power control and transformation. A simulation control mode, ac

segment, wide bandwidth, high speed, high spectrum utilization: With the diversification of user business, especially broadband, the information rate of the past Kbps or more than 10 kbps is not enough, many users require dozens of Mbps information rate. To improve the information rate, in addition to the use of advanced duplex technology, coding technology and modulation technology, the most basic is the wider channel bandwidth, the corresponding ne

adjustment unit can quickly track the channel change and adjust the rate by adopting different coding modulation schemes. When the channel condition is better, the Hs-dsch adopts a more efficient modulation method--16QAM to obtain higher frequency band utilization. Theoretically, although the XQAM modulation method can improve the channel utilization, but becau

IntroductionThe PDM represents the pulse density modulation. However, a better abbreviation is "1-bit oversampling audio" because it is simply a high-sample-rate, single bitrate digital system. If you are looking for an advantage, it is that the sample rate is several times the audio CD, and a proper way to reduce the word length from 16bit to 1bit, which will be the basis of a PDM system.Most modern digital audio systems use multi-bit PCM (pulse-code

scene of the accident. If a serious accident occurs in the tunnel, a fire may occur, therefore, after an accident occurs in the tunnel, an emergency evacuation broadcast system is urgently needed. FMFM broadcast in the tunnel is a good emergency broadcast. Drivers can obtain evacuation and emergency command information through the radio, this service provides emergency incident command and handling to guide drivers to avoid risks. Therefore, whether in terms of security or service to the work a

As an evolution after 3G-4G, do you know its technical characteristics? As one of the 4G standard record filing systems, wireless TD-LTE-Advanced adopts the multi-access method, frame structure similar to TD, and wireless MIMO technology. The following is a detailed introduction. Features of wireless TD-LTE-Advanced Technology 1. Multiple Access Method The wireless TD-LTE is based on OFDM technology, and OFDMA is used in the downlink. the uplink adopt

WiMax technology must reflect its own advantages in specific application scenarios in order to be recognized by the market. This requires application testing to measure system performance parameters. The test method of WiMax is divided into three parts: protocol analysis, radio frequency analysis, and transmission performance analysis. The Comprehensive Test results are obtained based on protocol analysis, radio frequency analysis, and transmission performance analysis. WiMax Acceptance Test An

command mode :map!Show all mappings in input mode Interface commands with Unix :!cmdRun the Unix cmd command :!%Execute the current file as a shell or Perl script :r !cmdInsert the result of the CMD command below the current line :r !head -n 3 fooInsert the first three lines of the foo file to the current row. shTemporarily exit the Unix shell Environment [Ctrl+z]Pause editing (use the FG command to return to the VI editor) :!cc%Compile the C program being edited :!javac %Compile the

term in the field of communication and computer networks. without ambiguity, "multiplexing" can also be called "multiplexing ". Multiplexing usually indicates the process and technology of transmitting multiple signals or data streams over a channel. (From wiki) OFDM: Frequency Division Multiplexing (Frequency Division Multiplexing) For example, in this figure, the bandwidth is divided into four parts, that is, there are four channels. The bandwidth