Wireless Communication Systems

  • You must enable blog
    in the Account settings to
    receive email notifications.
  •  
Let’s start mentioning some names: Nexus 7, iWatch, Google Glass, Galaxy Gear, PS 4, and iPhone 5C. Yes, they all are outstanding technological products and, in this blog, I want to develop one shared feature by all them: wireless communication systems. I would like to talk about signal processing, antennas, mobile networks, optical communications, and topics related to wireless communication systems. Therefore, I will use a technical vocabulary and specific content, but I will try to write some posts in a more general manner in order to be accessible to a major number of people. I would like to introduce the next topic that I’ve chosen for my next post in the following paragraph:
During the last years, the demand for mobile communication systems has spectacularly increased: at present, there are 6,800 million of mobile devices for a population of 7,000 people million in the world, and it is expected that, by 2014, there will be 7,300 million, according to the ITU. That is the reason why these systems have evolved, developing new technologies more efficient each time. The latest standard in mobile communication systems, Long Term Evolution (LTE) shows this evolution. It incorporates highly efficient techniques such as OFDM (Orthogonal Frequency Division Multiplexing) and other techniques like MIMO (Multiple-Input Multiple-Output).  In the next post, we will see the characteristics of the physical layer of LTE, mainly OFDM, in order to justify why its use is strikingly increasing in mobile communications.
Comments and feedback will be welcomed! wink
|

Latest Posts

  • Spread Spectrum Signals (Part 3)
    In this post we are going to see the most important pseudo-noise sequences that are used in DSSS (direct-sequence spread-spectrum). As it was mentioned in previous post, these are deterministically generated, therefore, the time waveform generated from the PN also looks like random noise for an undesired receiver. read more...
  • Spread Spectrum Signals (Part 2)
    The performance of a spread spectrum system is as follows: The transmitter modulates the carrier signal with a baseband signal in the traditional way. At the same time, a pseudorandom signal is generated from a pseudorandom sequence of binary pulses, which seems random if the receiver doesn’t know the way it was generated. This signal has a wider bandwidth than the band-pass modulated and it called the spread sequence. The band-pass signal generated from the first modulation is modulated again with the spread sequence. Depending on the type of system, this modulation can be performed on different ways. read more...
  • Spread Spectrum Signals (Part 1)
    Spread spectrum technique is widely used in wireless communication systems, as mobile telephone, and specially in GPS. read more...