dqpsk modulation

Architecture of the Bluetooth protocol stack Underlying hardware module RF 1. Use 2400m ~ 2483.5m band 2. Data is transmitted in FM mode, with a total of 79/EDR and 40/ble hops per second. 3. gfsk (dqpsk and 8 DPSK) modulation 4. channel interval (1 MHz/EDR mode, 2 MHz/ble Mode) Bb The Bluetooth system provides point-to-point or point-to-point connections. In the connection, devices share physical ch

of continuous improvement. A large number of active and passive devices are available, reducing costs quickly. The power flat, non-linearity, color dispersion, and polarization mode dispersion performance of various devices are significantly improved, so that the power redundancy requirements of the system design can be moderately relaxed. In particular, DQPSK/DP-QPSK modulation technology, Electronic Disp

The micro-cell network built in the double-layer Wireless Access Network is a network with the topic of the wireless LAN system. The combination of macro-cell networks saves IP Address Allocation and solves network resources and costs. What is the principle? The AN04W-X024 Wireless LAN system of WRI is used in micro-cells. The wireless LAN system consists of an AP (Access Point), a wireless network adapter, and a wireless bridge. The AP of a wireless Access Point uses an omnidirectional coverag

This article describes in detail how to apply a wireless LAN system in a dual-network environment and how to establish a network in a community, I believe that reading this article will help you. The micro-cell network built in the double-layer Wireless Access Network is a network with the topic of the wireless LAN system. The combination of macro-cell networks saves IP Address Allocation and solves network resources and costs. What is the principle? The AN04W-X024 Wireless LAN system of WRI i

-WLL system working frequency band for 1785--1805mhz, duplex mode for TDD, multiple access mode for CDMA+SDMA, modulation mode for DQPSK, this system should be the attention of the people in the domestic industry." (☆ Introduction to Programming Network ☆)6, based on cordless telephone technologyBased on cordless telephone technology, the wireless access network consists of DECT and CT2 in Europe, PACs in t

In electronic circuits, power supply, amplification, oscillation, and Modulation circuits are called Analog Electronic Circuits because they process and process continuously changing analog signals. 1. Feedback Feedback refers to sending output changes to the input end in some way as part of the input. If the return part and the original input part are subtracted, It is negative feedback. 2. Coupling An amplifier usually has several levels, and the as

use of channel bandwidth, but also avoid using high-speed balancing and anti-Burst Noise errors. OFDM is a special multi-carrier communication solution. The information flow of a single user is serialized/transformed into multiple low-rate bitstreams, and each bitstream is sent using one subcarrier. OFDM does not use a band-pass filter to separate subcarriers, but uses the fast Fourier transform FFT) to select waveforms that can maintain orthogonal even if they are overlapped. OFDM is a high-sp

user is serialized/transformed into multiple low-rate bitstreams, and each bitstream is sent using one subcarrier. OFDM does not use a band-pass filter to separate subcarriers, but uses the Fast Fourier Transform (FFT) to select waveforms that can maintain orthogonal even if they are overlapped. OFDM is a high-speed transmission technology in wireless environments. The frequency response curves of wireless channels are mostly non-flat, and the main idea of OFDM technology is to divide a given c

converter, it determines that it must occupy a certain amount of space and consume a certain amount of power in the system. Therefore, in system solutions that require convenient portability, the static D/A converter has to be replaced with [1].So people choose the so-called "Digital basis" D/A converter. There are two methods for digital D/A conversion: PWM (P Ulse Width Modulation) Pulse Width Modulation

Abstract: As more and more wireless devices enter people's lives, a large number of multimedia services also emerge. As multimedia transmission services require a certain amount of bandwidth, the bandwidth of traditional wireless networks also shows some shortcomings in expanding multimedia services. The emergence of OFDM modulation technology solves the bandwidth requirements of users to a certain extent. In addition, the OFDM

Transferred from: http://baike.baidu.com/link?url= KEOJCOEXYDZUH8N7BNUGEDUTAGLDGDI7ESJUSZESPUREBK0NI6SFMTPWGIRED-H-L3ZZ7CY6QSHXVHHILK7BCQ the speed at which a microcontroller or computer communicates at the serial port. Refers to the signal is modulated after the change in the unit time, that is, the number of times the carrier parameter changes in the unit time, such as 240 characters per second, and each character format contains 10 bits (a starting bit, 1 stop bit, 8 data bits), the baud rate

Figure 8-4-3 of the voltage controlled oscillator, this characteristic describes the oscillation frequency ω U of the voltage controlled oscillator. Take ω 0 Center, UC with input signal voltage (T) changes. The expression for this feature is (8-4-6) When UC (T) The oscillation frequency ω U of the voltage controlled oscillator varies with time It also changes with time. The phase-locked loop enters the "Frequency traction" and automatically tracks and captures the frequency of the input signa

This article mainly discusses the technical advantages of the wireless LAN Standard IEEE802.11g. Data Transmission Based on OFDM technology With the wide application of wireless LAN technology, users have higher and higher requirements on data transmission rates. However, in the indoor environment, the complex electromagnetic environment, the multi-pass effect, frequency selective fading, and other interference sources make it more difficult to achieve high-speed data transmission in wireless c

there are tags nearby. RFID is usually called a near-pairing system for communication at a very close distance. The range of near-pairing systems is usually 0 to 1 cm. This means that the tag is appended to the reader or pressed to the reader. The advantage of this close distance is that the label battery plant can produce a lot of energy. This energy is sufficient to support tag communication without the need for Built-in power. Near-matching is also conducive to highly confidential occasions.

Spectrum utilization, supporting high speed multimedia services, system capacity, multipath channel interference and other factors are the main starting points for the majority of fixed broadband wireless access devices to select CDMA (Code Division multiplex) or OFDM (Orthogonal Frequency Division multiplexing) as the key technology for point to Point (PMP). And these two technologies have their own strengths in these areas, so the equipment business needs to weigh the pros and cons of the actu

downlink data transmission rate of WCDMA network, Is 3GPP in the R5 protocol in order to meet the requirements of the data business asymmetry, it can be in the construction of the WCDMA network structure on the basis of greatly improve the user downlink data Service rate (theoretical maximum can reach 14.4Mbps), This technology is an important technique to improve the downlink capacity and data service rate in WCDMA network construction. (Computer science) 1, HSDPA technology and its new featu

------------------------------------------------------------------------------- Chorus reverbParameter value range descriptionMod. freq0.8hz0.1-20Hz Modulation SpeedMod. depth40 % 0-100% modulation depthMod. dly1.3ms0-24ms delay time before initiation of modulationRev. time2.4s0.3-30s reverb timeHigh ratio0.70.1-1 high-frequency attenuation rateDiffusion70-10 reverb DiffusionDelay Time between ini. dly30ms

the data is represented by binary or more discrete level values. Therefore, the communication channel maximum transmission rate and channel bandwidth have a clear relationship, so people can use "bandwidth" to replace the "rate." For example, people often use the network's "high data rate" to express the "high bandwidth" of the network. So "bandwidth" and "rate" are almost synonymous in the discussion of network technology. ------------------------------------------------------ bit rate. Baud

attenuation rateDiffusion60-10 reverb DiffusionThe delay time between INI. dly12.0ms0.1-200.0ms and early reflection.Cut-off frequency of lpf4.0khz1.0khz-16108khz.thru low-pass filterCut-off frequency of hpfthruthru, 32hz-8khz high-pass filter Reverb vocal used for voice and chorus reverbParameter value range descriptionRev. time1.9s0.3-30.0s reverb timeHigh ratio0.50.1-1.0 high-frequency attenuation rateDiffusion60-10 reverb DiffusionDelay Time between INI. dly16ms0.1-200.0ms direct and earl

amplifier. This product is specially designed to support GSM/edge pam and 3G/3.5g pa. Because the space of the circuit board in the mobile phone is very precious, the designer no longer needs to use two independent step-down converters. FAN5904 supports 3G wireless standards from WCDMA to HSUPA +, as well as the world's popular CDMA 200 1x EV-DO. In addition, the device supports China's 3G standard TD-SCDMA and HSUPA for TD-SCDMA signal modulation fo