Monday, February 28, 2011 9:44:00 AM
When we think about communication in a telecommunications system, the first thing that comes to mind is someone talking to another person.
Although it may seem simple, the transmission and reception of information is quite complex, considering the many possibilities and scenarios where this may occur.
And one of the main schemes is involved in the modulation. So try to understand what it is today.
Note: Our goal here is to be as simple and straightforward as... read more
Thursday, February 24, 2011 9:42:00 AM
We can define Frequency Hopping as a communication scheme between a transmitter and a receiver. There are several concepts involved, such as spread spectrum modulation and switching frequency according to a known standard.
Frequency Hopping (FH) is widely used for example in GSM Networks, so let's understand a little more about it today.
First, a Brief History
But before we talk about FH: does who invented it?
Several people competes for this title, as the... read more
Tuesday, February 22, 2011 9:41:00 AM
Have you ever heard of "Rake Receiver"? Surely you've heard of Receiver (Receiver in English), and you probably have heard of Rake (Rake in English).
With the pictures bellow, can you imagine what a Rake Receiver can be?
Ok, if the analogy does not help much, let's go.
In a wireless communication system, the signal can reach the receiver via multiple distinct pathways.
In each path, the signal can be blocked, reflected, diffracted and... read more
Sunday, February 06, 2011 9:40:00 AM
Today let's understand what are the parameters MAIO and HSN in a GSM network.
The terms MAIO and HSN are also often used, but many people are confused about it's planning. That's right, HSN and MAIO are used in frequency planning of a GSM network, and know them well naturally will lead us to better results.
Quickly: The HSN is used to define the hopping sequence from one frequency list, and MAIO is used to set the initial frequency on this list.
It did not help?... read more
Tuesday, February 01, 2011 9:39:00 AM
If you work with UMTS,'ve probably heard someone talk about RTWP. Its definition can be found in a dictionary of acronyms, such as http://acronyms.thefreedictionary.com/RTWP: Received Total Wideband Power.
Represents a measure of UMTS technology: the total level of noise within the UMTS frequency band of any cell.
RTWP is related to uplink interference, and its monitoring helps control the call drops - mainly CS. It also has importance in the capacity management, as it provides... read more