mvno carriers

carrier interval and a constant. 1T,2T,3T,..., KT guarantees the orthogonality of the sine wave sequence.　　1.2 Next, the cos (t) is also introduced. It is easy to prove thatcos (t) is orthogonal to sin (t) and is orthogonal to the entire sin (kt) orthogonal family. Similarly, thecos (KT) is also orthogonal to the entire sin (kt) orthogonal family. So the launch sequence expands to {sin (2π δf t), sin (2π δf 2t), sin (2π δf 3t),..., sin (2π δf kt),cos (2π δf t), cos (2π δf 2t), cos (2π δf 3t),..

to the entire sin (kt) orthogonal family. Similarly, the Cos (KT) is also orthogonal to the entire sin (kt) orthogonal family. So the launch sequence expands to {sin (2π δf t), sin (2π δf 2t), sin (2π δf 3t),..., sin (2π δf kt), cos (2π δf t), cos (2π δf 2t), cos (2π δf 3t), ..., cos (2π δf kt)} is also a logical.1.3 After the first two steps of expansion, selected 2 sets of orthogonal sequence sin (kt) and cos (KT), this is only the transmission of "media." The actual information to be transmi

In the next few years, carriers will use SDN technology to enable their man and wan to carry cloud services. Therefore, they need a multi-layer SDN architecture to optimize the routing network and transmission capabilities, this increases the flexibility, scalability, and efficiency of man and wan. Preface Cloud Computing technology has completely changed the design and operation of data centers (iDCs. SDN technology introduces this on-demand concept

There are many access networks in China, and wireless access networks are also widely used in people's daily lives. So I studied the problems in the development of access networks. I would like to share with you here, hoping to help you. First, the current user experience before the integration of fixed and mobile services and networks, whether it is mobile or fixed services, their businesses require multiple contracts, multiple numbers, multiple user data files, and multiple bills. At the same

, and the station site should be determined for a lot of new stations; compared with GSM, WCDMA network capacity is more sensitive to the regularity of honeycomb structure, more stringent to station site and antenna height, and requires large-scale redesign of network. Scheme two: A large number of micro-cellular, deployment of layered Network (HCS), the macro-honeycomb and micro-cellular settings to different levels, the use of specific cell re-election or switching algorithms, will be in the

WiMAX Overview World wide (WiMax) is a wireless transmission technology based on the IEEE 802.16 standard. As the "last mile" technology connecting users, WiMax is developed to replace broadband wired networks such as DSL and support mobile broadband wireless access, it uses OFDM transmission technology for NLOS connections, providing a data rate of up to 75 Mbit/s. The IEEE 802.16-2004 physical layer is divided into two modes: OFDM and OFDMA (Orthogonal Frequency Division Multiplexing ). In the

APN IDs. The URI address is "content: // telephony/carriers ". The Code is as follows: [Java] View plaincopyprint? Uri uri = URI. parse ("content: // telephony/carriers "); Cursor Cr = getcontentresolver (). Query (Uri, null ); While (CR! = NULL Cr. movetonext ()){ // APN ID String id = Cr. getstring (Cr. getcolumnindex ("_ id ")); // APN name String APN = Cr. getstring (Cr. getcolumnindex ("APN

), that is, a idle transmission period. Reduce ICI by Cyclic PrefixHowever, after the protection interval is added, due to the influence of multi-path propagation, inter-channel interference (ICI) occurs, that is, the orthogonal behavior between sub-carriers is damaged, interference occurs between different subcarriers, as shown in. Due to the existence of the multi-path Delay, the idle protection interval enters the integral time of the FFT. As a res

-commerce-oriented enterprises to represent the ISP and value-added services provider; three to Hong Lian 95, run the message for the representative to provide basic telecommunications services, It also includes MVNO (Mobile virtual operators) Of course, this division is not very accurate, because more and more virtual operators operating in a variety of business, such as the run and telecommunications in the long-distance telephone business agent and

developers, etc.) to provide the telecommunications capabilities to the outside world as a service.Also known as the fourth business form of cloud computing, Huawei is already working on the establishment of CaaS's ecological circle.6. What does Maas mean?MaaS (machine as a service) Internet of things as services, this concept with the creation of the Internet of things, the two common forms of business is Mai and MaaS, so MaaS belongs to the form of the Internet of things business.As the numbe

receive free, package beyond the Domestic voice dial 0.1 yuan/minute, domestic flow 0.1 yuan/mb. Domestic SMS 0.1 yuan/article. sugar peas: A free custom card products, no monthly rent, according to the use of custom to customize the voice, SMS and traffic, with how much spent. Unit price minimum 9 cents. Everyone has the option of buying. That is, the domestic voice dial 0.09 yuan/minute, domestic flow 0.09 yuan/MB, domestic SMS 0.09 yuan/article Lenovo mobile Phone Card purchase method:

With the increasing hardware performance of computers and internet devices and the explosive growth of Internet applications, the demand for Internet bandwidth is also higher. Even if the network only provides Internet access services for Intranet users, as long as it has a certain scale, it generally chooses multi-carrier links to achieve Internet access. The choice of Multi-link egress is to improve the overall bandwidth and network reliability of the network; the choice of multiple

1 IntroductionCurrently, mainstream fixed network operators are facing severe challenges. The competition in the telecom market is becoming increasingly fierce. Traditional voice services are subject to heterogeneous delivery of mobile and grouped voice, which lacks business and revenue growth points, traditional businesses are gradually commercialized with low-value Commodity), so finding new business growth points, increasing business revenue, reducing costs, and making full use of network res

The APN full name is access point name, the Chinese is the AP, which is a parameter that must be configured to access the Internet via the phone, which determines which access method the phone accesses to the network.The Android system keeps all the APN in the database, the absolute path of the database:/data/data/com.android.providers.telephony/databases/telephony.db.Use the ADB command to export the database to view:ADB pull/data/data/com.android.providers.telephony/databases/telephony.db e:/G

the application of the XDSL discrete multi-Audio System and the wired modulation. OFDM is a special multi-carrier modulation technology. User information must first be converted into multiple low-rate data streams through serial to parallel conversion. After encoding, modulation is a RF signal. The traditional modulation technology can transmit data at only one frequency at the same time, while OFDM can send multiple signals at the same time, it can be said that it is a parallel transmission of

minimum bandwidth is not guaranteed. The operator is vigorously developing the network card, so the bandwidth of individual users may be a bottleneck, not as mentioned when introducing 3G. QoS cannot be guaranteed due to packet loss and disorder in wireless data transmission, which needs to be solved by RevA. The problem is that China Telecom was previously Unicom (one of the worst technology carriers) the inherited network will be upgraded to suppor

At present, there is no mature scheme for reference in the establishment of the NGN business profit model in the world. This is mainly because: on the one hand, the growth of new business needs of users has the characteristics of gradual change and imbalance. For the deployment of new networks, it is difficult to stimulate a "burst" of business demand growth in a short period of time. At the same time, in terms of operators, a new set of O M personnel should be trained and added in the initial

mobile phone manufacturers-operators-consumers. One of the important differences is the role of mobile phone dealers. In the domestic mobile phone market, due to reasons such as insufficient energy of early carriers, rapid popularization of mobile phones, and distribution of interests among various parties, mobile phone dealers occupy an important position in the mobile phone industry chain. However, when domestic operators gradually grow and discove

definite symbol (called symbol n) is generated by the characteristics of the multi-path problem in the nl OS link. You can see the next symbol (called the symbol n + 1) interference. OFDM broadband wireless access technology uses the symbol's initial protection interval (GI) cycle to overcome the ISI problem. The protection interval can be interpreted as the part of the symbol damaged by the ISI. The data cycle at the protection interval carries the data load. Using OFDM broadband wireless acce

placed in floor distribution boxes according to the principle that Splitter is as close as possible to users. Obviously, this ideal layout highlights the inherent advantages of PON, but it will inevitably lead to the following problems: first, high-core optical cables are required from the central data center to the residential area, such as 3000 residential areas, in-16-core computing, nearly 200-core optical fiber cables are required. At present, only 4-12 cores are required. It is very diffi