wideband narrowband

optical splitter will lead to optical power loss, so the transmission distance of the ATM-PON is generally not more than 20 kilometers, limited coverage. In terms of economy, the current cost per line of the ATM-PON system is relatively high, the main reason is the limited market. FSAN believes that as user demand increases, product scale increases, and new technologies are adopted, the device and installation costs on each line will be significantly reduced.

can not be transmitted on the ordinary medium long-distance, or inter-code interference and attenuation can not make the signal recovery, so the carrier to the baseband signal modulation, reduce the bandwidth, Can make the signal reliable transmission, reduce attenuation, the receiver and then demodulation to restore the original digital signal. The carrier frequency is relatively single, so the modulated signal has a smaller bandwidth.Wideband SignalWideband signal is a relative concept, it re

I have made a lot of introductions and descriptions in the previous articles on the ultra-wideband wireless network. Therefore, we must have some knowledge about the ultra-wideband wireless communication layer in the previous ultra-wideband wireless protocol. Next, we will continue to look at the media access control layer of the ultra-

Ultra-Wideband (Ultra-Wide Bandwidth) pulse communication (Impulse Radio) is very different from other communication technologies. It has the advantages of low signal power spectrum density, difficulty in detection, and low system complexity, it is especially suitable for high-speed wireless access and military communication in intensive and multi-path indoor areas. This paper introduces the Signal Representation of the ultra-

tl026c voltage-controlled amplifier IC and Linear technology ' s LT1014 (or any other similar basic quad op amp).Features of wideband ALC amplifier circuits with 50mhz/-3db bandwidth and 20DB compression characteristicsThis is a circuit that stabilizes input level signals to a certain level, and is used in circuits with high performance requirements, where the output level fluctuates due to the uneven frequency characteristics of these signal generat

"Transcoding" for each family may not be the same, but the logic is the same, I am sharing today is another Pat cloud on the narrowband high-definition transcoding, close to the "transcoding", more basic, theoretical knowledge will be relatively more. Share content mainly divided into two pieces, the first is to introduce what is narrowband high-definition transcoding, the second is to introduce and pat the

Today's wireless users have no end-to-end requirements for higher capacity, faster access speeds, and higher data throughput capabilities, leading to the increasing radio signal bandwidth of cell base stations. As far as the network is concerned,

HD Voice, also known as wideband Voice, is an audio technology that transmits HD, natural voice quality to cellular, mobile, and wireless headsets. Compared with traditional narrowband telephones, HD voice improves voice quality to a large extent and reduces the hearing burden.All networks and devices on the communications industry chain need to support HD voice to demonstrate the benefits of this technolog

This article describes in detail the origins of the ultra-wideband wireless access technology, developed from the wireless UWB technology, that is, the pulse radio technology. It is used in a broader field and is integrated with our daily lives. It not only facilitates entertainment and work. Ultra-Wideband Wireless Access Technology According to the problems of serious

and military communication applications in intensive indoor multi-path locations. Although the description of Ultra-Wideband is not detailed, it does help to separate this technology from the traditional "narrow band" system, or the updated system mainly refers to the "Broadband" system of the future 3G cellular technology described in the document. There are two main differences between ultra-wideband and

a conventional discrete synthesizer. The NI pxie-5644r can be used in wideband instrument designs and is characterized by the ability to create a traditional discrete synthesizer from scratch. This approach allows NI pxie-5644r to achieve good measurement performance across all frequency ranges of the instrument.The NI pxie-5644r includes the following three different PLL bandwidth options, which differ in phase noise and settling time.1. High bandwi

into mobile access and fixed access. Fixed wireless access technology mainly include: 3.5GHz wireless Access (MMDS), Local multicast distribution service (LMDS), 802.16d, mobile wireless access technology mainly includes: based on 802.15 Wpan, WLAN based on 802.11, WiMAX based on 802.16e , based on the 802.20 Wwan. According to the bandwidth, it can be divided into narrowband wireless access and broadband wireless access. The broadband wireless acces

it can ~ 4000Hz) and less than 7 kHz music encoding, sampling rate is 16 kHz, its 32 Kbps bit rate reconstruction speech quality is equivalent to 64 Kbps g.722 Sb-ADPCM. In practical applications, the audio quality of this algorithm is higher than that of MP3 and other audio algorithms when the bit rate is low. In addition, the low complexity of this algorithm is very suitable for embedded platform communication and storage applications. Finally, it provides a 14 K bandwidth audio encoding sche

The basic description of speex includes a command line encoder and decoder. these tools generate and read the speex files packaged in the Ogg container. although it can encapsulate speex in any container, Ogg is recommended as a file container. this section describes how to use the command line tool for the speex file of Ogg. 4.1 speexencThe speexenc unit is used to create a speex file through a raw PCM or wave file. You can use the following command:Speexenc [operation] input_file output_fileVa

As for the concept of passive optical network, the PON standard based on ATM was proposed in early the 1980s, and the corresponding g.983 suggestion was defined by Itu/fsan, namely Apon. The author also participated in the meeting of the National TNS Optical Devices Working Group at the end of last year, and participated in the review of the communication industry standard of "ATM based passive optical network (a-pon) with 155mb/s burst Optical transceiver Module Technical Requirements". From th

Ultra-Wideband Wireless Technology is favored by more and more emerging wireless technologies due to its high transmission rate, low power, and small scale features. However, its very high modulation bandwidth (usually higher than 500 MHz) and relative bandwidth (> 20%) pose many challenges to the development and testing of the ultra-wideband product. The traditional general testing method is insufficient i

WCDMA is the English abbreviation of wideband Code Division multiple Access (wideband Code Division multiplex), which is a third generation wireless communication technology. W-cdmawideband CDMA is a third generation mobile communication system, which is developed by 3GPP, based on the GSM map core network and Utran (UMTS terrestrial Wireless access network) as the wireless interface. Currently, WCDMA has r

The Wireless World is booming, and various wireless technologies have begun to compete. The wireless UWB technology has great advantages in both cost and transmission speed. Other advantages are described below. The focus of this article is to introduce the six advantages of the wireless UWB technology. The Ultra wide band is short for Ultra Wide Band. It is a non-carrier communication technology that transmits data using non-sine wave narrow pulses ranging from nanoseconds to microseconds, with

measured in the following 6 properties:-Bit rate;-The bandwidth of the signal;-Subjective/objective voice quality;Delay-Computational complexity and memory requirements;-Sensitivity to channel error;In order to make the encoded audio information widely used, it is necessary to use the standard algorithm to encode the audio information. Traditional conference TV equipment mainly uses ITU-T recommended audio standards such as G.711, g.722, g.728 and Aac_ld.Second, the General Audio Protocol intro

. Judging by the latest development trends, 802.11G will likely be the product standard for most wireless network product manufacturers. Microsoft's desktop OS Windows XP and Embedded operating system Windows CE, all include support for Wi-Fi.4) UWB TechnologyUltra-wideband TechnologyUWB (Ultra wideband) is a wireless carrier communication technology, it does not use the sine wave carrier, but the nanosecon