Fading margin (large and smaller scale)
v1 l1 l2
RH l1 # v1 # v*1
l2 # v2 # v*2
K ?„ b2
a2 b2
v1 Ca*b
b2
1 S# K
RH # v1 l1 # v1
l1 a2 b2
l2 0
Trace(RH) l1 l2 a2 b2
Det(RH) l1 # l2 0
RH c a2 a*b
ab* b2 d
RH H*H
P
1
2 Zh11 Z2 2Re5h*
11h21w26 Zw2h21 Z2
1
2 Zh12 Z2 2Re5h*
12h22w26 Zw2h22 Z2
PERFORMANCE IMPROVEMENT TECHNIQUES 285
6. Interference and noise
7. Receiver interference and noise
8. Receiver antenna gain
9. Receiver KF
10. System data rate
Next, we will provide an example of the link budget where we wish to arrive with a value of SNR
or Eb/No that the receiver would have to perform. We begin with the following equation for SNR:
(5.170)
where Srxreceived signal power, Nonoise power spectral density, BW bandwidth, NF noise
figure. We can further elaborate on the above variables as
(5.171)
where we have refined the variable expressing the received signal with Stx transmit power, Grx of
antenna gain of the receiver, Gtx antenna gain of the transmitter and PL path loss.
The common approach to present and analyze a link budget is through a table as shown in Table 5.5.
SNR
Stx # Gtx # Grx
No # BW # NF # PL
SNR
Srx
No # BW # NF
286 CHAPTER FIVE
TABLE 5.
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