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Each transponder consists of a receiver tuned to a specific channel in the uplink frequency band, a frequency shifter to lower the received microwave signals to a channel in the downlink band, and a power amplifier to produce an adequate transmitting power.
The work covers two stages: one characterizes specificities of channels in the GSM900 downlink band, in order to improve experimental measurement capabilities, and the other assesses the exposure level inside the whole downlink band with best precision during 24 h.
Here the wide-band artifacts stretch several hundreds of MHz primarily due to strong signals in the nearby UMTS downlink band.
The AGC lifts the noise floor due to strong signals in the UMTS downlink band (2110 2170 MHz) and is visible as wide-band artifacts in the spectrogram.
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Figure 2 illustrates a system model of a downlink band-AMC scheduler with multiple bands that are shared among the different users.
As the uplink and the downlink bands are spectrally separated, the received signal will not be directly impaired by the leakage of the transmitted signal which is filtered by the Rx Low Pass Filter (LPF) after the demodulation.
The downlink frequency band (7.25 7.75 GHz) of X-band for satellite communication is notched using Symmetrical Split Ring Resonator Pair (SSRRP) as electromagnetic coupling element near microstrip feed line which produces band stop characteristics.
The NASA Deep Space Network (DSN) has a new requirement to support high-data-rate Category A (Cat A) missions (within 2 million kilometers of the Earth) with simultaneous S-band uplink, S-band downlink and Ka-band downlink.
Since the LTE downlink frequency band (2.6 GHz) is close to the WiFi band (2.4 GHz), it is fair to assume the same value for LTE as for WiFi.
Uniplanar plus shaped EBG structure is used for notch in X-band downlink satellite communication band.
A user of UE2 establishes connection with HeNB at downlink frequency band from 795 (797.2 MHz) to 805 MHz (817.2 MHz).
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