The simulation described consists a baseband parts only. The parts included are illustrated in figure 1. Only the highlighted blocks are implemented. The transmitter is, as illustrated, made up of four distinct functional blocks.
A collection of innovative technological features demonstrates the engineering force behind the system. The use of certain technological features is motivated by the benefit that is offered.
The variety of the level of technologies is wide; from small details hidden deep in the system to revolutionary new concepts at the top level of the system, visible to all users. The world is becoming digitalised. Analogue systems in many fields of technology are being replaced by a modern digital alternative.
One of the main improvements when compared to the first generation cellular systems is that GSM is a digital system. We shall take a closer look in this module what it means that the system is digital, and what benefits it offers.
A key feature in any cellular mobile network is that several users can communicate without disturbing each other. As a matter of fact, the frequency band that is allocated for mobile communications is always limited and a lot of effort is spent to develop systems that can serve as many users as possible in a given band.
GSM uses a combination of two distinct methods to achieve these tight requirements. Digitalisation GSM is a digital system.
Let's take a closer look at what it means, if a signal is analogue or digital. An analogue signal means in principle, that the signal can have any values at any time.
A good example is a traditional thermometer outside your window. In theory, if we had eyesight well enough, we could distinguish arbitrary small differences in the temperature.
If the reading of the thermometer were converted to an electrical form, such as voltage, we would have an analogue signal. The radio link is the most vulnerable part of the connection and a great deal of work is needed to ensure its high quality and reliable operation.
This issue will be discussed in other modules. The use of separate uplink and downlink frequencies enables simultaneous communication in both directions. The radio carrier frequencies are arranged in pairs and the difference between any pair of frequencies uplink-downlink is called the Duplex Frequency.
The frequency bands utilised in GSM are centered on carrier frequencies spaced kHz apart.
As an example, the following table shows the allocation of frequencies in GSM In GSM the duplex frequency the difference between uplink and downlink frequenciesTitle: 3G Systems WCDMA (UMTS) & Cdma Author: Rut Sánchez Martínez Director: Ari Rantala Date: February, 28th Overview In this document I make a study of third mobiles generation systems.
At first I will center the study in the objectives and main characteristic of this generation. The main focus of this work is to evaluate the rate of transmission and spectral efficiency for GSM, WCDMA, and LTE on MHz band.
For the purpose of this analysis, a simulator for EDGE and WCDMA was developed, which allows a performance evaluation analysis.
Lab #1: GSM Transceiver Measurements 1 Introduction In this laboratory work properties of GSM Mobile Stations (MS) are investigated. The goal is to learn. Evaluate BER in GSM and WCDMA Systems 1 BER in GSM System: Approach and Conceptual Transceiver Structure: The simulation described consists a baseband parts only.
The parts included are illustrated in figure , where a conceptual block diagram of a . WCDMA, like many modern mobile systems, uses a link adaption system where specific combinations of Modulation and Coding Schemes (MCS) are specified.
The base station adjusts the MCS and power control to maintain a target HARQ repetition rate. capabilities up to BER and BLER evalu-ation. The R&S CMU-K67, -K68 and -K69 WCDMA signalling options are new on bility of this tester to evaluate the DUTs.
For example, the user can now estab- WCDMA, GSM and Bluetooth. Since practical UMTS applications are still in .