Radio Frequency Optimization of GSM

Abstract: GSM network consist of different cells and each cell transmit signals to and receive signals from the mobile station, for proper working of base station many parameters are defined before functioning the base station such as the coverage area of a cell depends on different factors including the transmitting power of the base station, obstructing...

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Absolute Radio Frequency Channel Number (ARFCN

The Absolute Radio Frequency Channel Number (ARFCN) is a unique number given to each radio channel in GSM. The ARFCN can be used to calculate the exact frequency of the radio channel. Within the GSM900 band ARFCN 1 to 124 are used. In the GSM1800 band ARFCN 512 to 885 are used. The ARFCNs used in GSM1900 overlap with the ARFCNs used in GSM1800. In GSM1900, ARFCN 512 to 810 are used. A multiband mobile phone will interpret ARFCN numbers 512 to 810 as either GSM1800 or GSM1900 frequencies. The mobile phone will...

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Why is the GSM 900 better than GSM 1800 and GSM 1900?

Since, I used the GSM 1800, the signal of GSM 1800 is less than GSM 900 when I was in the room. I wonder about it, Hense, I try to ask the engineers and find the informations, then I got the answer from WiKiAnswer. Because, GSM 900 can hold more no. of subscribers as compared to GSM 1800 & 1900. Also, since   c= f x (lambda) Which implies smaller frequency means longer wavelength and longer wavelength would travel a longer distance than a short wavelength in same environment requiring less transmit...

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Additional features in Frequency Hopping

Frequency HoppingFrequency Hopping improve s the C/I and Freq uency reuse factor and thus adds capacity into the radio network. The final capacity improvement of frequency hopping depends on the number of channels and the frequency bandwidth. The implementation of frequency hopping also has signification effect on the frequency planning which furturemore depends strongly on the frequency hoppin scheme. The baseband and Sythetized frequency schemes are typically utilized for example in the GSM mobile Network and frequency band limitation or sufficiency,...

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How to configure Mail Postfix with Dovecot on Linux

1. RequirementPostfix, Qpopper, Mailx, Mailman, Apache2, PHP5, Dovecot2. Configure Postfixvim /etc/postfix/main.cfmail_spool_directory = /var/mailcanonical_maps = hash:/etc/postfix/canonicalvirtual_alias_maps = hash:/etc/postfix/virtualvirtual_alias_domains = hash:/etc/postfix/virtualrelocated_maps = hash:/etc/postfix/relocatedtransport_maps = hash:/etc/postfix/transportsender_canonical_maps = hash:/etc/postfix/sender_canonicalmasquerade_exceptions = rootmasquerade_classes = envelope_sender, header_sender, header_recipientmyhostname = linux.meanchey.comprogram_directory...

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