Thus, the anti-parallel diodes more effectively block the small signals and prevent transmitter noise
from contaminating the receive signal.
In this paper, with simplified inverse-FIR and -PLL digital filters proposed to compensate for the signal attenuation, an FIR-embedded [DELTA][summation] fractional-N PLL is presented to perform RF phase modulation for GSM/EDGE polar transmitters, achieving good trade-off between transmitter noise
For a GSM system, the allowed handset transmitter noise
, which can appear in the receive band of a co-located handset, is given in Table 1.
is often specified by its relative intensity noise, which also can be used to determine the noise figure of optical amplifiers.
Looking into this test situation, four noise sources are found: the input thermal noise, receiver added thermal noise, transmitter noise
leakage in Rx band and quantization noise.
This low attenuation causes considerable transmitter noise
interference in the receiver front end.
This condition results in a transmitter noise
floor (without filtering) of +30 - 155 = -125 dBm/Hz.
Low levels of target impose transmitter noise
level restrictions that exceed today's technology.