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difference between cdma&wcdma
planning for WCDMA and CDMA is a complex process as u must take coverage and capacity into account in an interative process. most BTS vendors have tools to calculate this, if u want a simplistic "coverage only" approach u can prepare link budgets (one for each...
what is wcdma
CDMA uses 1.25 MHz carrier bandwidth
WCDMa uses 5 MHz carrier bandwidth
the difference would be in the system capacity which is uch better in WCDMA than in CDMA if u're comparing the same services. However this capacity enhancement is also used to provide higher data rat services...
I would suggest to get a breadboard, a programmer and start with some simple code.
i haven't found any useful similators for the PIc, for the AVR it is integrated itn he design suite AVR studio and it's very good
Re: Jamming in Cdma
Jamming immunity is provided against other narrowband signal interfereing in the same bandwidth, because the spreading code is multiplied by the received signal, all interference is flattened and the wanted signal is amplified.
however, the system is interference limited...
Re: moving display on led
there are many similar project on the forum for moving led display, try to have a look on the c code and I am sure u can port it to your compiler.
try searching the forum for moving led matrix display
BR
Suggestion:
- Add a general purpose amplifier chip (74001) that can be used to drive a stepper motor or some really bright leds.
- a buzzer on board that can be connected to an IO pin with a wire or a jumper is useful also
- an on-board 4x4 keypad is useful, but if you don't have the space, you...
Re: newbie to pic
Hello,
A good book on embedded design in general is "Embedded C" by Michael J pont. Another book is "PIC Microcontroller project book" and "Mike Predko guide to the PIC"
I think you can find all these books in the upload/dowload section on this forum.
For PIC Chip numbers...
ephone 23 octo-line
Hello,
I think what is originally requested in this post (and what I am also looking for) is some keypad decoding routines to be able to use for example a 4x4 Keypad to generate the normal digits (0 to 9) plus the whole alphanumeric characters (a to z) like a mobile phone...
how easy is it to eavesdrop on gsm phones
Hello,
I think the most common type of interception equipment that is required by the government law enforcement agencies from any mobile operator is usually installed at the core network since it is far more easier (air interface encryption is not...
Re: GPS and this crazy IDEA!
Hello,
I agree with the concept of using the cellular network for the location identification, this is an applicatin of Location Based Services they are actually being marketed as "know where your kid is " services and "I am lost" and other gaming applications...
schematic gsm jammer
Hello,
Illegal as it may be to use jammers, from the technical discussion pov, I think that the jamming process depends on the following factors:
- distance or cell area to be jammed
- Power that the Base Station is transmitting at or its EIRP (depends on transmitter...
what is lump on usb cable
Hello,
Usually this "lump" is a ferrite filter to filter any external or self induced interference, this is sometimes necessary for longer cables to achieve the maximum possible data transfer speed.
These filters are available in a lot of other interface cables...
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