Digital wireless systems

The best way is to modulate your signal at 5.8GHz and embed the phase correction data into the data stream. I assume the data flow is one- way only.

Hi,

Yes, The data is flowing in one way. Would you please suggest some hardware. I am also thinking about bluetooth. Please advice!

Regards, John

Bluetooth will not give you 1.5MHz data rate. In fact, 5.8GHz might not be enough, but the next ISM band is 25GHz.

Any suggestions regarding Hardware? Regards, John

The Atmel ATR2820 RF Transceiver would be a good start, but I can't design your apps without knowing the full spec.

One-off project or a few dozen or a few hundred thousand? Per week?

A hobby/learning/grow-your-brain project or for sale (and use) by a third party?

Will UL/CSA/EC/FCC/etc. certification be required?

Are the consequences of a communications failure: none, benign, pretty bad, or someone dies?

Is this for a medical application (noting that your IP block is from Wayne State University Medical Center)?

With that out of the way, if you can grind down the data rate a bit (no pun intended), you're close to being able to use an off-the-shelf solution like an XBee module, advertised to top out at 1 Mbps.

--
Rich Webb     Norfolk, VA

Take a look at the RF data rate of 250Kbps. Does it mean the same for me as for you?

Hi,

What do you think about Texas Instrument's IEEE 802.16 (WiMax) chip set ( TRF1X/2X RF Chipset ). Please advice!

Regards, John

No.

Maybe.

Forget about Bluetooth, WiFi, XYZBee, WiAnything. If you want slicings or channelings, you need 25GHz. To get 1.5MHz data rate, you need the full bandwidth for 5.8GHz.

Why do I need the bandwidth of 5.8GHz. Please advice! John

Radio Freguency Modulations and Demodulations.

How many bits at the 1.5MHz rate? In other words, how many Mbps?

Regular old 802.11g wireless routers will get you >50Mbps; channel bonding (40MHz occupied bandwidth) gets you up to >80Mbps in the best cases... which is just as good as anything you get on 5.8GHz WiFi. (These are all *average* throughputs, taken from the "wireless charts" at

ch

rage*

)

Hi,

48 bits at 1.5Mhz rate?

John

Never mind, Bluetooth 2.0 would be fine. I thought you mean 1.5Mbps sustained.

You don't need 5.8 GHz of bandwidth, and no one has said that you do. But because you asked to be able to transmit continuously at 1.5 Mbps, you are going to need a high carrier frequency. Your responses to various replies indicate you really don't understand what you are asking for. So if this is anything but a hobby project, I'd "advice" you to hand this task to someone with RF experience. What you are trying to do is non-trivial because you want the equivalent of an unswitched "coax cable in the sky". Most chipsets that are available assume a much different environment, where data is packetized, pipeline delays are acceptable, retransmissions on errors or lost packets are allowed, channel equalization is dynamic, data travels in two directions (at least for acknowledgements) etc. Accounting for the overhead of these other things so you can use some vendor's OTS chip set will only increase your total bandwidth requirements. I think you'll need a custom solution or else you'll have to scale back your requirements.

Steve

"48 bits at 1.5Mhz rate?"

That's 72Mbps, so you can just manage it with the best WiFi routers out there. Go visit smallnetbuilder.com for the particular models...

bonding

Not sure if he meant 48 bits per second, per millisecond or per microsecond.

Not so, Wifi are rated at burst data rate, not sustained rate.

Sure, the advertised data rate is something absurd like "300Mbps!" But go read the link I provided -- the best routers absolutely do better than 70Mbps

*on average*. Obviously the speeds gets reduced as you move further from the router or have other interferers that reduce SNR, but close-in something like a Belkin N1 will do the job (see: for under $200.

(see:

for under $200.

And you probably want his spartan FPGA to talk ethernet as well.