Frequency hopping in gsm pdf file

O in fh each call hops between a defined set of frequencies. Frequency hopping in list mode for each frequency the associated level is also stored in the lists. This enables incoming signals of different strength to be simulated for receiver testing. The main technique for frequency hopping is that 1 carrier atleast uses more than one predefined frequecy to serve their purpose. Frequency hopping free download as powerpoint presentation. Pdf slow frequency hopping is a quality and capacity enhancement feature for the gsm system. Therefore, gsm frequency hopping belongs to slow frequency hopping. In b aseband hopping, the transmitter will change its frequency on frame basis. Frequency hopping in gsm networks next tech solutions. Frequency hopping parameters can be changed in any operating mode, but the test sets operation is not effected until it is set to a valid operating mode. Pdf user description, frequency hopping kamillion iam. Frequency hopping spread spectrum fhss and direct sequence spread spectrum dsss. By transmitting the message energy over a bandwidth much wider than the minimum required, spread spectrum modulation techniques present two major advantages. Frequency hopping for gsm base station tests with signal.

Frequency hopping can only occur when the operating mode is set to one of the following. The difference between slow frequency hopping and fast frequency hopping is that the frequency of latter changes faster than frequency modulation. A list may contain up to 2000 frequency level entries. Pdf slow frequency hopping solutions for gsm networks of. We modified airprobe to support hopping channels by taking iq data samples from files corresponding to each arfcn of interest. In gsm, the frequency remains the same during burst transmission. Usually, power control and discontinuous transmission technologies are adopted to lower system interference. When using close frequency reuse technique, system interference is the most important factor for frequency reuse ratio. Gsm slow frequency hopping is intended to reduce the adjacent cells interference by switching between a set of arfcns that are orthogonal to the set used by own cell. Frequency hopping in gsm networks o gsm networks use slow frequency hopping, a hop occurs before each time slot is transmitted every 4. Frequency hopping spread spectrum file exchange matlab. Gsm radio interface uses slow frequency hopping sfh technology. However, in order to achieve a significant gain from frequency hopping, it has been shown that at.