gsm
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 a simplified form, the principle of the interleaving process applied to a full-rate speech channel. The diagram shows a sequence of ‘speech blocks’ after the … Read more
The Definition of Interleaving is simply encode logical channel for error protection and security.lets understand how interleaving works in gsm. Having encoded, or error protected the logical channel, the next step is to build its bit stream into bursts that can then be transmitted within the TDMA frame structure. It is at this stage that the process … Read more
The standard propagation model is a model (deduced from the Hata formula) particularly suitable for predication in the 150MHz~3500MHz band over long distance (1Km<d<20Km) and is very adapted to GSM900/1800, UMTS, CDMA2000, WiMAX and LTE technologies. This model uses the terrain profile, diffraction mechanisms (calculated in several ways) and take into account clutter classes and … Read more
Here I write on simple how guard band requirement for LTE for 2 option. Guard band requirement LTE verses GSM and guard band requirement LTE FDD verse LTE TDD Guard Band Requirement: LTE-FDD vs GSM/UMTS Configuration is simpler for FDD based systems because both LTE FDD and its neighboring technologies are based on frequency duplex … Read more
Here I write down one basic idea of Spectrum reframing in LTE and why operators require spectrum reframing for LTE. Operators worldwide are looking forward to new LTE technologies deployment but not every one of them possess brand new spectrum required for LTE deployment. As a result, many networks are expected to perform some level … Read more
Assume that the eNodeB receiver’s IF bandwidth is Bw (unit: MHz), and the eNodeB receive noise figure is Nf (unit: dB), The equivalent noise level of the eNodeB receiver is as follows: No = –174 + 10 log (Bw) + Nf (Unit: dBm) If the demodulation carrier-to-interference ratio C/I (unit: dB) of the eNodeB receive … Read more
When you are planning for LTE network then two points also needs to take care frequency band reframing requirement and location of operator coverage requirement for LTE network. Let’s check both in detail. Frequency Band Reframing Requirement for LTE Some of the most popular questions from operator these days are How they can perform reframing? … Read more
LTE sites deployed by using 3 sector. Each sector operates on the same carrier frequency. Nomenclature for this reuse pattern is 1 x 3 x 1. This range of frequency reuse represents a number of sites in a template re-use, the number of sectors in each site, and the number of channels on the site. … Read more
Three of India’s largest mobile networks have requested that a portion of the radio spectrum reserved for CDMA services be re purposed for use by the GSM networks. Bharti Airtel, Vodafone and Idea Cellular sent a joint letter to the Department of Telecoms. “We recommend that the 800 MHz spectrum band is harmonies with the international … Read more