In an urban area, satisfactory cell phone service requires a signal-to-interfere
ID: 2082589 • Letter: I
Question
In an urban area, satisfactory cell phone service requires a signal-to-interference ratio, Ohm, of at least 15 dB with a probability of 95%. The standard deviation of the shadowing is sigma_L = 8 dB. Calculate the threshold value of the signal-to-inference ratio, Ohm_T, for which a cell phone system must be designed for two cases as follows: a. The cross-correlation of shadowing along the in-cell path and the interfering is R_12 = 1. b. The cross-correlation of shadowing along the in-cell path and the interfering is R_12 = 0.Explanation / Answer
Signal to inference ratio is also known as carrier to interference ratio is the quotient between average received modulated carrier power s or c and the average received co channel interference power than other tranmsmittors than the useful signals.
1=E[1]=S/I I/S 1/2 <_E[S/i]1/2 E[I/S]1/2
=> SIR1>_SIR-1
Wireless mesh networks are self tuned or self organised network of Mesh routers and Mesh client.
TDMA based 802.11 WMN. combination of long distance and local access links.
Simultaneous transmission of nearby links causes interference.Interference degrades the performance of WMN.It also effects capacity of WMN ,routing protocol,optimal channel assignment.Knowledge of links that interferace with each other is also useful in TDMA WMN Spatial re-use.
Evaluation of signal to interference based interference mapping strategy on a 802.11b/g based outdoor mesh network.
evaluate effects on SIR on nertwork rate in controlled setting to predict inter link interference.
study of inter link interference in outdoor network to predict inter channel interference.
formulate an effective strategy for estimating inter channel interference uisng SIR matric.
P[SIR]=P[S1]-P[S2]
P[SIR] represent SIR at R1
P[S1] represent RSSI form node S1
P[s2] represent RSSI form node S2
simultaneous broadcast :S1 and S2 broadcast at same time.1000 bite UDP packets for 30 seconds.
stage 1 measures the rate of S1-R1, in presence of interferer S2.
finally the cross correlation of shadowing along the in-cell path and the interfering is R12=1,
and the cross-correlation of shadowing along the in-cell path and the interfering is R12=0.
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