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Results tagged with wireless
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user 18033
Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (Radio Frequency). Distances can be as low as centimeters (e.g. RFID); there's no upper limit.
2
votes
How to include Rayleigh fading into path loss model?
You might want to read up on that and maybe try searching for "Wireless Sensor Network RSSI Localisation algorithms" to see common ways the problem you have is commonly tackled in literature. …
- 1,770
3
votes
Why can't the orthogonal PN codes help in the near-far effect?
CDMA is very unique in comparison with other multiplexing schemes because it doesn't (even in the ideal case) completely remove interference from other users. In an ideal time based (i.e TDMA) or an i …
- 1,770
2
votes
Accepted
Transmission of information in terms of information theory and protocol
For a wireless channel an expression for the capacity when the noise is gaussian can then thus be calculated as shown in the answer HERE. …
- 1,770
1
vote
What are the equations/values for Rayleigh Fading, path loss and log-normal shadowing?
If you want a complete treatment you can read Chapter 2 and 3 of the free wireless book by Goldsmith linked HERE. …
- 1,770
0
votes
Is it necessary to allocate multiple channels at the same time window?
I see no reason why can not share the channels in the way you propose, as long as all your devices are synchronised in time so they know when to start and/or stop using a particular frequency band the …
- 1,770
1
vote
Wireless channel interpretation
Now, given that our wireless system is supposed to be able to support a maximum speed of say \$v_{\text{max}}\$ we usually assume \$\theta (t)\$ to be uniformly distributed between \$[0,2\pi]\$ as this … In practice, the spectrum will most likely be not as severe as that and the spectrum will typically be something like (image is from Introduction to Space-Time Wireless Communications by Paulraj): …
- 1,770
2
votes
1
answer
2k
views
Transmission via RF433Hz Transmitter/Receiver pair failing AVR
I am trying to send data wirelessly through a RF433Hz receiver/transmitter pair, but nothing seems to want to work.I want to the transmitter to continuously send a number (0x81) to the receiver when I …
- 1,770
1
vote
How are simultaneous transmissions decoded at the receiver?
You will always get interference if two TX-RX pairs utilise some transmission channel (i.e. use the same frequency bands to transmit) at the same time. The extent to which the interference will hamper …
- 1,770
1
vote
Actual procedure used to establish a MW link budget in telecom?
In addition to this, the tool also used by the wireless research community. …
- 1,770
1
vote
Could transmit/receive turnaround be improved by having a heterodyne receiver switchable bet...
When a transceiver is transmitting the PLL frequency is set to Fs and when it is receiving the PLL frequency is set to either a frequency greater than Fs by the intermediate frequency or one lower th …
- 1,770