Which Digital modulation scheme to use

[mehboob_iiui]

About designing a simple tranceiver systems consisting of a few similar tranceivers that modulate voice and other data as packets, what I want to know is what modulation scheme and carrier frequency should I use . the devices should operational within 100m of eachother.

so calls can be packet switched and the devices can act as routers..

 

[manojshukla]

use BPSK.
iT IS SIMPLE TO IMPLEMENT AND EASY TO ANALYSIS. iTS BER IS ALSO LOW.
BEST OF LUCK.

 

[ahmed1]

hi
u can use QPSK
it's good

 

[Mubashir]

U can use OFDM if u desire a system like wireless LAN. I can give u books on OFDM.

 

[rockywong]

You shoule determine one important thing: What is your data rate demand?19K?10M?100M?

As operate frequency,ISM(2.4G) is a good choice.

If you don't want to build Rome yourself,you can buy complete solution chips ,such as BlueCore(by CSR) ,a SOC bluetooth chip

 

[changfa]

The carrier frequency to be used depends on your transmission range as well as the available frequency band. In general, the higher the carrier-frequency the higher the attenuation.

Which modulation to be used depends on many factors, for example,

-what is the expected transmissino rate of your system?
-what kind of propagation is your system operating on?
-is there channel informatino at the receiver? (coherent or non-coherent modulation)?

Therefore, you really need to know more details about your system before choosing specific scheme.

 

[some1mohsin]

develop ur own scheme, its good