qam modulation

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

), while Morse code carries information that needs to be transmitted. Spark gap mode generated by electromagnetic waves, occupy the entire electromagnetic spectrum, so a mountain not two tigers, the only possible way of cooperation is that we take turns Republicans.This dilemma, finally in 1906, was a breakthrough by Canadian prodigy Reginald Fessenden. Fessenden, only 14 years old, has shown a prominent mathematical genius, was assigned to the school assignment mathematics, to other children cl

1. Set the channel bandwidth to 3400Hz and adopt PCM encoding. The sampling period is 125b/S. If the sample size is 128, the data rate of the channel is ()? Resolution:The sampling period is 125b/s, so it is 8000Hz, that is, F = 1/T = 1/0. 000125 = 8000Hz, 128 quantization levels, requires 7-bit encoding (that is, the 7th Power of 2 ). R (data transmission rate) = 1/T * log2n = 8000*7 = 56kb/s ---> B (modulation rate) = 1/T baud PS. Because the sampli

performance. More and more applications are applied to modern electronic technology, also known as the module power supply. Is currently the main direction of power development, smaller, more efficient, more stable ---- High Integration, higher efficiency, and more powerful functions are currently the main development direction of Power Supply Modules Of course, the input of the switching power supply is not limited to AC (AC/DC power supply), but also DC (DC/DC power supply and DC/AC power

adjusted by the duty cycle of the excitation signal. The voltage variation of the input signal can be compensated by frequency modulation or Width Adjustment, when the power frequency grid voltage changes greatly, it can still ensure a stable output voltage. Therefore, the voltage regulation range of the switch power supply is very wide, and the voltage regulation effect is very good. In addition, there are two methods to change the duty cycle: Pulse

more suitable for creating video editing applications. You will benefit from it as an application developer. Des replaces the cut table, and the cut table is no longer supported. Two new interfaces, idvdcontrol2 and idvdinfo2, greatly expand the functions of the DVD navigator. The DVD navigator now implements a complete command set of the DVD Annex-J, which can play either the karaoke or the album. The new mswebdvd ActiveX Control enables this feature to be used in script-based applications. Th

Each capture/compare channel is centered around a capture/compare register (including the shadow register), including the captured input (digital filtering, multiplexing, and pre-divider ), and the output part (comparator and output control ). The capture/compare module consists of a preload register and a shadow register. Only the pre-loaded registers are operated during the read/write process. In the capture mode, the capture occurs in the shadow register and then copied to the pre-loaded regi

generally becomes the 2.75 generation network. Is a GSM source code and channel code. The principle diagram of the GSM mobile phone is as follows: The circuit structure of a mobile phone (hereinafter referred to as a mobile phone) can be divided into four parts: Wireless, transmission and processing, interface, and power supply. The circuit principle can be summarized into two parts: RF circuit and Baseband circuit.1. Wireless partIt includes antenna circuit, transmission, receiving,

CPU policy learning: Advantages and Disadvantages of interactive policies I believe that people who study CPU policies often listen to others or say that each strategy has both good and bad performance and power consumption, and the power consumption with good performance is high, reducing Power Consumption sacrifices performance. Is that true? Even if it is true, why ?? Next we will find the advantages and disadvantages of the interactive strategy during the learning process, think about the

process is called "modulation", and it is realized by changing the physical characteristics of electromagnetic waves. We modify the amplitude (such as AM radio), frequency (such as FM radio), or electromagnetic wave phase, which refers to the position where the frequency spans the 360-degree period at any specified time. We can also modify these variables in combination. For example, orthogonal amplitude modulati