Category: GSM

INTRODUCTION   Predesign drive test for measurement integration This is at beginning of design when no site has been built or even selected. All test sites are temporary. Drive test…

Hata Model is applied for GSM Link Budget,here i write about its formula and Cell Size Estimation. Hata´S Empirical Formula PL = 69.55 +26.6log10fc – 13.82log10hb + (44.9 – 6.55log10hb)log10R…

Receiver sensitivity is the ability of the receiver to receive signals in the sense that any signal below the sensitivity is considered as noise and is not usable. Receiver sensitivity…

The Mobile Equipment and SIM are the only parts of the GSM network which the subscriber will really see. Let’s see what inside it. GSM Mobile Equipment There are three…

Repeater units are designed to receive signals from a donor site, amplify and rebroadcast the donor sites signals into poor coverage areas or to extend the coverage range of the…

To protect the logical channels from transmission errors introduced by the radio path, many different coding schemes are used. The diagram below illustrates the coding process for speech, control and…

What is Echo Canceller and why it require in GSM – as from name Echo canceller is nothing but the process to remove duplicate signal or delayed signal, let’s see…

To Improve Error Protection and Security of Data the Data is Interleaved and its type is Diagonal let’s check how it works. The diagram below illustrates, in a simplified form,…

As All Channel Interleaving in GSM but control channel is some different interleaved its interleaving rectangular lets understand how it. The diagram below illustrates, in a simplified form, the principle…

Interleaving in gsm used in gsm to reduce error and for speech diagonal types interleaving used here I write how speech in gsm interleaving diagonally. The diagram below illustrates, in…