What is frequency hopping in GSM?
Frequency hopping is the technique of improving the signal to noise ratio in a link by adding frequency diversity. In a GSM/GPRS/EGPRS network, frequency hopping is specified in individual cells based on the number of frequencies offered by a specific cell.
What is the advantage of frequency hopping?
There are some of the advantages of frequency hopping spread spectrum (FH-SS) given below : It has less distance effect. Provide the greatest amount of spreading. The bandwidth of these systems is large.
Why is frequency hopping used in uplink?
Frequency hopping is one of the techniques that can be used to improve the uplink performance by providing frequency diversity and interference averaging. The hopping can be between subframes (inter-subframe) or within a subframe (intra- subframe).
What is meant by slow frequency hopping and fast frequency hopping?
In slow frequency hopping, multiple symbols are transmitted in one frequency hop. In fast frequency hopping, multiple hops are required to transmit one symbol. One or more symbols are transmitted over the same carrier frequency. A jammer can detect this signal if carrier frequency in one hop is known.
How many types of hopping are there in GSM?
There are two types of frequency hopping based on use of RF carrier frequencies for the RF transceivers for burst transmission in GSM. They are synthesized frequency hopping and baseband frequency hopping.
What is frequency hopping?
Frequency hopping is a technique mainly used to keep two or more RFID readers from interfering with each other while reading RFID tags in the same area.
What is Pucch and Pusch?
Description. PUSCH — physical uplink shared channel. The PUSCH carries RRC signaling messages, UCI (uplink Control Information), and application data. PUCCH Format 1 — physical uplink control channel format 1. The PUCCH format 1 is used to carry uplink control information (UCI) pertaining to scheduling requests and …
What is the type of frequency hopping?
What does WCDMA stand for?
What Does Wideband Code Division Multiple Access (WCDMA) Mean? Wideband Code Division Multiple Access (WCDMA) is a third-generation (3G) standard that employs the direct-sequence code division multiple access (DS-CDMA) channel access method and the frequency-division duplexing (FDD) method to provide high-speed and high-capacity service.
What are the rules of frequency-hopping?
There are some rules that control the way the frequency-hopping devices are utilized. For example, in North America, the industrial, scientific, and medical wave band (ISM wave band) is split into 75 hopping channels. The power transmission of these hopping channels does not exceed 1 watt on any channel.
What is TDD mode in WCDMA?
The TDD mode of WCDMA actually employs a combination of TDMA and CDMA. CDMA allows multiple users to share a channel at the same time, while TDMA allows users to share the same channel by chopping it into different time slots. CDMA offers the benefits of multipath diversity and soft handoffs.
What is FH-CDMA and how does it work?
Frequency Hopping Code Division Multiple Access (FH-CDMA) is a basic modulation technique used in spread spectrum signal transmission. FH-CDMA is the repetitive switching of frequency at the time of radio transmission. This helps to reduce the strength of electronic warfare, that is, the unauthorized jamming or interception of telecommunications.