lte dbm

Question 16: Time Synchronization 1.Wireless Link Quality Detection To ensure the correct transmission of downstream signaling and data, the UE side needs to check the downlink quality after the cell search is complete to ensure that the downlink signaling and data are correctly received, the UE implements uplink synchronization with the base station through the random access process. After that, the base station continuously sends timed adjustment commands to the UE to maintain uplink synchroni

After writing the previous blog, "LTE cell search-Physical cell ID and synchronization signal PSS, SSS," I would like to continue to write system information related content, but found to write the time necessary to involve PDCCH, Phich and other content, and these content has not been systematically written. So the next few posts will write some of the LTE background knowledge that needs to be mastered.Thi

1. Frequency band (Band)The so-called frequency band , refers to the wireless decoder in the specified degree of distortion and rated output power of the operating band width, refers to a frequency range or the width of the spectrum , that is, the minimum operating frequency of the wireless decoder to the maximum operating frequency range, The unit is Hz. For convenience, in LTE, a digital 1-43 is used to denote different bands (36101-v10.21.0 version

There is types of frame structure in the LTE standard, type 1 and type 2. Type 1 uses Frequency Division duplexing (Uplink and downlink separated by Frequency), and TDD uses time division Duplexin G (Uplink and downlink separated in time). This overview covers both LTE FDD Type 1 signals and LTE TDD type 2 signals described in the standard documents listed in The

10. show. php3 lt ;? If ($ login) {require ( quot; common. php3 quot;); if (! Isset ($ id) error ( quot; why didn't I enter the user ID? Quot;); else {$ idchop ($ id); $ dbmdbmopen ( quot; class q 10. member information display file show. php3 If ($ login ){ Require ("common. php3 "); If (! Isset ($ id) error ("Why didn't I enter the user ID? "); Else { $ Id = chop ($ id ); $ Dbm = dbmopen ("class", "r "); If (! Dbmexists ($

10. Member information display file show. php3If ($ login ){Require ("common. php3 ");If (! Isset ($ id) error ("Why didn't I enter the user ID? ");Else {$ Id = chop ($ id );$ Dbm = dbmopen ("class", "r ");If (! Dbmexists ($ dbm, $ id) error ("this user id is not available! ");Else {$ Data = dbmfetch ($ dbm, $ id );$ Info = explode ("|! :! | ", $ Data );$ Name =

3. Delete member del. php3Require ("common. php3 ");$ Id = chop ($ id );If (! Isset ($ id) error ("Enter the user id to delete! ");Elseif ($ pwd Else {$ Data = dbmopen ("class", "w ");Dbmdelete ($ data, $ id );Dbmclose ($ data );$ Data = dbmopen ("password", "w ");Dbmdelete ($ data, $ id );Dbmclose ($ data );Header ("location: index. php3 ");}?>4. Public file common. php3$ Adminpass = "test ";Function error ($ msg ){?>Error cause: Style = "font-size: 9pt "> }?>5. log on to the login. php3 file.R

1. DBMDBM is the absolute value of power. The formula is: 10lgp (power value/1 MW ).[Example 1] If the transmit power P is 1 MW, it is converted to dBm and then 0dbm.[Example 2] for 40 W power, the converted value in dBm unit should be:10lg (40 W/1 MW) = 10lg (40000) = 10lg4 + 10lg10 + 10lg1000 = 46dbm. 2. DBI and DBDDBI and DBD are the obtained Gain values (power gain). Both are relative values, but the

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3. Delete member del. php3 Require ("common. php3 "); $ Id = chop ($ id ); If (! Isset ($ id) error ("Enter the user ID to delete! "); Elseif ($ PWD Else { $ DATA = dbmopen ("class", "W "); Dbmdelete ($ data, $ id ); Dbmclose ($ data ); $ DATA = dbmopen ("password", "W "); Dbmdelete ($ data, $ id ); Dbmclose ($ data ); Header ("Location: Index. php3 "); } ?> 4. Public file common. php3$ Adminpass = "test ";Function error ($ MSG ){?>Error cause: Style = "font-size: 9pt "> }?> 5. log on to the

10. Member information display file show. php3 If ($ login ){ Require ("common. php3 "); If (! Isset ($ id) error ("Why didn't I enter the user ID? "); Else { $ Id = chop ($ id ); $ DBm = dbmopen ("class", "R "); If (! Dbmexists ($ dBm, $ id) error ("this user ID is not available! "); Else { $ DATA = dbmfetch ($ dBm, $ id ); $ Info = explode ("|! :! | ", $ Data )

10, member information display file SHOW.PHP3 ? if ($login) { Require ("common.php3"); if (!isset ($id)) error ("How did you not fill in the user ID?") "); else{ $id =chop ($id); $DBM =dbmopen ("Class", "R"); if (!dbmexists ($DBM, $id)) error ("No this user id! "); else{ $data =dbmfetch ($dbm, $id); $info =explode ("|!:!|", $data); $name = $info [0];$nickname = $

3. Delete Member Del.php3 ? Require ("common.php3"); $id =chop ($id); if (!isset ($id)) error ("Please enter the user ID to be deleted!") "); ElseIf ($pwd else{ $data =dbmopen ("Class", "W"); Dbmdelete ($data, $id); Dbmclose ($data); $data =dbmopen ("Password", "w"); Dbmdelete ($data, $id); Dbmclose ($data); Header ("location:index.php3"); } ?> 4. Common file Common.php3 ? $adminpass = "Test"; Function error ($MSG) { ?> Cause of error: Style= "font-size:9pt" >? } ?> 5, landing documents LOGIN.

Question 11: special sub-frame ratio of LTE sub-frames (Supplement to question 7) To solve this problem, I didn't quite understand the protocol at the beginning. For example, I often encounter this problem:LTENeutron frame ratio is1, Special sub-frame Ratio7What does this mean? Search for related questions online. The answers collected online are summarized as follows: First, in the TDD frame structure, the frame length is 10 ms and is divided into 10

, and the dwpts length of 2nd half frames is 1 ms. Uppts and sub-frame 2 are used as the uplink, and sub-Frames 7 and 9 are used as the downlink.Physical resources Basic time unit Antenna Port LTE uses antenna ports to differentiate space resources. The definition of an antenna port is defined from the receiver's perspective. That is, if the receiver needs to distinguish the difference in space between resources, multiple antenna ports need to be d

China Mobile Shanghai company plans to launch TD-LTE trial for commercial use in the first half of next year. On June 28, at the fifth session of the Shanghai Communications Development Conference, Mao weiliang, deputy general manager of the data business department of China Mobile Shanghai Company, revealed that in the second half of this year, TD-LTE terminal only data card, wait until the first half of

to technical system lags behind, weak data bandwidth capabilities, and poor mobility, it is difficult to meet the development requirements of industry private networks. To help private network users solve the above problems, narrowband Digital cluster technology has clearly evolved to a broadband multimedia Cluster Based on LTE, the TD-LTE-based broadband multimedia digital cluster solution is favored by u

Before reading this article, it is recommended to take a look at the post "LTE-TDD HARQ (1)-upstream HARQ timing" to better understand the content of this article.The main contents of this article include:(1) What is the Phich channel and what is its role?(2) How to uniquely identify a Phich channel(3) What is the content of the Phich channel corresponding to the reg actual mapping?(4) Location of the Phich channel1. What is the Phich channelPHICH Cha

This article describes how to import DBM data to a mysql database. If you need it, refer to this example. First of all, I used PERL to store files in the DBM database. There are more than 50 thousand records and each record has 15 fields. I want to use MYSQL now. I want to export the record.Step 1: import all DBM records to a text file, and separate each field by

Some key LTE technologies in Vernacular I have never been in touch with the actual LTE equipment because I am working on CDMA, but I have read a lot of theoretical materials, including the red books. I personally feel that Chinese books are not very good yet, it covers a wide range of topics, but there are very few details. If you want to study it in depth, unless you look at the agreement, but how tired t