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Archived from groups: alt.internet.wireless (More info?)
Are delay spread specs of interest, e.g., in designing point-to-point
links? How does one use them, if at all?
For example, the delay spread specs @11Mbps, @5.5Mbps, @2Mbps,
and @1 Mbps, respectively, for two cards are are:
65ns / 225ns / 400ns / 500ns --- ORiNOCO Gold
140ns / 300ns / 400ns / 500ns --- Cisco 350 Aironet
My vague understanding is that delay spread is the difference in time
between the unreflected signal and the most delayed reflected version.
If so, it seems to me that delay spread would then really be a
property of the environment, not the radio; and that the
"delay spread" spec of a radio is really the maximum delay spread
that the radio can tolerate for a given error performance.
Is that the correct interpretation? Does this mean that the Cisco
is better than the ORiNOCO, in that it can tolerate larger delay
spread (i.e., more amount of reflected signal) at 11Mbps?
Are the terms "reflected signal" and "multipath" synonymous,
such that the delay spread spec is an indication of radio
susceptibility to multipath?
TIA
Are delay spread specs of interest, e.g., in designing point-to-point
links? How does one use them, if at all?
For example, the delay spread specs @11Mbps, @5.5Mbps, @2Mbps,
and @1 Mbps, respectively, for two cards are are:
65ns / 225ns / 400ns / 500ns --- ORiNOCO Gold
140ns / 300ns / 400ns / 500ns --- Cisco 350 Aironet
My vague understanding is that delay spread is the difference in time
between the unreflected signal and the most delayed reflected version.
If so, it seems to me that delay spread would then really be a
property of the environment, not the radio; and that the
"delay spread" spec of a radio is really the maximum delay spread
that the radio can tolerate for a given error performance.
Is that the correct interpretation? Does this mean that the Cisco
is better than the ORiNOCO, in that it can tolerate larger delay
spread (i.e., more amount of reflected signal) at 11Mbps?
Are the terms "reflected signal" and "multipath" synonymous,
such that the delay spread spec is an indication of radio
susceptibility to multipath?
TIA