professorgr
Newbie level 1
Hello
Ive done it in the past (3-4years ago) but focusing on green perspectives + an 'old' mind trying to remember lead me to request some clarification on the types i am going to use.
Trying to calculate SIR in cdma network for downlink, using BS omnidirectional antennas, a simply scenario for voice service.
According to selected type of service we choose, p.e. voice, data rate, video etc we set the requested eb/no vaue (in dB). For voice we can set it to 5dB.
Proceesing gain: for voice acceptable data rate is around 12-13kbps so PG~=25dB.
Thermal noise Pn ~=-103dBm
Orthogonal factor a= 0.1-1.
Interferences: Icochannel: a*Pbs/pathloss, for every new user coming to our sector (BS antenna coverage)
Adjacent channel: Iadjacent: Pbs - pathloss(user,bs), for every new user coming to our cluster
First user gets only Themal noise so: ebn0 = PG + Pbs -pathloss - Pn
Second till end user: ebno = PG + Pbs - pathloss(user,bs) - (Pn + I)
where I = Ico-channel + Iadjacent
I am assuming something wrong? Do i forget something?
Thank you in advance.
Ive done it in the past (3-4years ago) but focusing on green perspectives + an 'old' mind trying to remember lead me to request some clarification on the types i am going to use.
Trying to calculate SIR in cdma network for downlink, using BS omnidirectional antennas, a simply scenario for voice service.
According to selected type of service we choose, p.e. voice, data rate, video etc we set the requested eb/no vaue (in dB). For voice we can set it to 5dB.
Proceesing gain: for voice acceptable data rate is around 12-13kbps so PG~=25dB.
Thermal noise Pn ~=-103dBm
Orthogonal factor a= 0.1-1.
Interferences: Icochannel: a*Pbs/pathloss, for every new user coming to our sector (BS antenna coverage)
Adjacent channel: Iadjacent: Pbs - pathloss(user,bs), for every new user coming to our cluster
First user gets only Themal noise so: ebn0 = PG + Pbs -pathloss - Pn
Second till end user: ebno = PG + Pbs - pathloss(user,bs) - (Pn + I)
where I = Ico-channel + Iadjacent
I am assuming something wrong? Do i forget something?
Thank you in advance.
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