Why is gsm downlink frequency lower then uplink?
111583
The free space losses increases in log ratio with frequency, Since your mobile has much less power than the Base Station, using a lowe frequecy the attenuation due the distance is less in the uplink. \nYou can see the same issue in satellite communications. Earth stations uses higher frequencies than satelites.\nFSL = 20Log(F*d)+ 32.4\nF: Frequency (MHz)\nd: Distance (Km)
1048363
This is a common problem with wireless routers and cordless phones. Many phones use a 2.4ghz frequency which is the same frequency as most wireless routers. Basically the only way to fix the problem is to replace your cordless phones with newer ones of at least 5ghz.
581907
Try changing the channel on the Wireless Access Point.  If you're in the United States, valid channel numbers are 1, 6, and 11.  Try one of the other two valid channel numbers.\n\nIf you have a cordless phone or other device that transmits on the 2.4 GHz frequency, try moving its base station further away from the Wireless Access Point.
826878
All radio transmissions can be considered analog even the digital ones like FSK, PSk,QAM, since the carrier is sinsoidal which is analog, however the data are digital so they change the carrier characteristic in discrete way. in mobile systems such as GSM the type of modulation is GMSK (gausian minimum shift keying), which is a special type of FSK (frequency shift keying), in FSK the frequency of the carrier is alternating between two values, each frequency represents a logic state (digital), which can be processed by the mobile circuitry. again the FSK is an FM signal whith the message being digital (binary)
453361
That sounds like a DSL speed which should not be dependent on other users in your area unlike cable. The internet is busier on nights and weekends so just slower in general depending on which sites you visit.
1065562
First thing it is signal. But to see how good signal you are getting. You can double click your tinny monitor from your taskbasr showing wireless connection (connected). Once you open that window you will see a bar showing the percentage of signal you are getting. It is just like a bar in Cellular phone.\n\nHope it will help.
100730
CDMA2000 and GSM cell phone technology
249666
Hello !\n\nThe difference between them is the frequency.\n\nCell phones use: 800, 900 or 1800 MHz or GHz[i hope I'm not wrong]\nand the\nWireless network uses: 2.4 GHZ and 5 GHZ spectrum.\n\n\n© ßogdan @ CyE CORP.
676226
It can very with line distance from source and city and line noise and modem the quality of ISP"s equipment\n\nMost people get between 19.2  and 53.3\n\nIf you're in a city you should be getting above 40.0\n\nTo check to see if you have alot of line noise pickup the phone and dial number 1 to clear dial tone if you hear a bunch of line noise it will probably make your connection on the slow side ,if you only hear silence it you should get a faster connection..
1048130
hi friend you better take air tel .i am also using it from many years. it's having better connectivity all over the country.bye
374599
Its because the connection speed between the laptop or what ever wireles device you are using is slower (54Mb per sec) where as if it is wired its generally 100Mb per sec.\nthats if ur talking about download speed, web browsing etc etc?\nhope that answere things
833784
It can't really. The key here is 'information' and information is different from data. The thing is that the data you are sending doesn't contain as much information as you think it does. In other words it can be compressed. So the data you can cram down a phone line is first compressed and then sent in a way that makes the absolute best possible use of the available bandwidth. \n\nit's not worth going into the details of the modulation techniques, in the end they all require a small change in the signal to pass a bit of compressed data and that requires bandwidth. There's no magic in this, just clever physics and software.\n\n(n2thepowerofn below) Lol!
131118
Frequency hopping consists in changing the frequency\nused for transmission at regular intervals. It has been introduced in GSM mainly in order to deal with two specific problems which affect the tranqmission quality:\nRayleigh fading: The radio signals are subject to fading,\nwhich is approximately Rayleigh distributed. For a slow\nmobile, a fading dip may cause a severe information\nloss. Frequency hopping will spread sequential information\nin the frequency domain. Since the Rayleigh fading\nis frequency selective, frequency hopping will cause frequent changes of the fading, thus reducing the risk of\nlosing sequential information. Introducing this frequency\ndivers& will, together with the interleaving and coding,\nimprove the transmission link quality, for slow mobiles\nin particular.\nIntegerence: Without frequency hopping, strong signals\nfrom neighbor cells transmitting on or close to a carrier\nfrequency will affect the carrier signal continuously,\nwhich may negatively affect the transmission performance.\nFrequency hopping will cause different signals to\ninterfere with the carrier at different times, a property\ncalled interference diversi9. On system level, the result\nis a “smearing” of the interference between users, an\neffect often called inteference averaging. Furthermore,\ninterference diversity gives a second effect, which is\nemphasized in this paper. Since sequential bursts of\ninformation are received under different interference\nconditions, the risk of a sequential information loss is\nreduced. This, together with the interleaving and coding,\nwill improve the transmission link quality.
872740
Hi there,\n\nIf it is a Dial up modem then:\n\n1. Start > Control Panel > Phone and Modem options > Modem Tab > Properties > Modem Tab again > Select 57600 as Port speed since 115200 gives a pseudo connection speed resulting in slow connections. Click OK and close all the windows. Restart your system.\n\n2. Check with your ISP/Telephone company for any AT Strings required.\n\n3. Remove any Fax / Answering machine from the same line.\n\n4. Avoide to use cable more than 2-3mts long.\n\n\nHope this helps...\n\nArash Shirali...
591871
Better try putting extra settings in advance connection properties.\n\nExtra settings like   S10=250  will work for most of modem cards. Or better find out the extra settings from your modem manufacturers site...
182787
I would look for sources of interference such as cordless phones and microwaves.  Make sure there are no metal objects between the laptop and the access point.  Use NetStumbler to find out if you have neighbors with wireless.  It will tell you which channels are free.  Try to use 1, 6, or 11 if you can.  They are the only ones that don't overlap each other.\n\nI wouldn't mess with your antenna.  Higher gain does not mean better reception.  When you manipulate power and gain, you change the shape of the coverage.  In some special cases it could help but your AP is probably tuned correctly out of the box.
692657
wireless application protocols (WAP), 3g, gprs etc... mostly using gigahertz frequencies under environmental health spectrum, around 3.5GHz.... these spectrum also covers radio waves and microwaves, some transmitted via satelites.