Interference - Co-Channel and Inter-symbol

Hi, Is Co-Channel Interference difficult to be overcome than Inter-Symbol Interference in radio environment ? I serached the internet, but did not get any specifc link that talks about these in detail. Any ideas ?

Thx in advans, Karthik Balaguru

Reply to
karthikbalaguru
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It depends on the relative strength of the co-channel interference. ISI has some of the predictability of an echo, and so can be dealt with in ways that don't work with co-channel interference.

Jerry

Reply to
Jerry Avins

Of course there are no specific links, since your question is not sufficiently specific in and by itself. The only general statement that can be made is that ISI is usually modeled as a convolution between the input signal and a linear, time-invariant channel. In that case, it may be possible to undo the effect of ISI by either explicitly estimating the transmitted signal -- which is the whole point of communication -- or at least knowing what the transmitted signal looks like.

Whereas for co-channel interference, even if the modulation format is identical, you may end up decoding for two users in order to cancel them.

Of course, like Jerry pointed out, it depends on the relative strengths.

Or something like that ;-).

Julius

Reply to
julius

...

Easier to say than to do. Suppose a conversation taking place in a room with a radio playing. The radio, being louder, makes the conversation nearly unintelligible. On television, that's no problem. The nerd guru twiddles a few knobs, types a few lines on a keyboard, and the conversation is clear. Now lets get real. Somehow, a clean recording of the broadcast is available. How much will that help?

...

Jerry

Reply to
Jerry Avins

Thx for that info ! How can Adjacent channel interference(ACI) be rated in terms of difficulty in comparison with ISI and CCI ? I am just curious to know about the Most difficult noise to be overcome in radio communicaton.

Karthik Balaguru

Reply to
karthikbalaguru

IMO, the most difficult is in channel phase noise from a strong adjacent signal.

John

Reply to
John

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