5-7 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
5.2.1.3 Modulation Index RCL, Uplink and Downlink
The purpose of this loop is to ensure that the error in the modulation
process of the physical carrier remains within acceptable limits,
regarding both spectral emission requirements and receiver
performance degradations.
The control is implemented by estimating the average error in a phase
increase of the modulated carrier, inside the demodulator, and sending
a correction message to the corresponding transmitter by means of a
RCL message over the air-interface.
The RN modulation index compensation uses a subset of the active
terminals to receive the feedback.
5.2.1.4 Clock Phase RCL, Uplink only
The purpose of this loop is to control the symbol frequency of each
terminal in transmission, in order to have the two clock phases aligned
as much as possible. In this way the node receiver can sample the
received signal at the lowest possible frequency ensuring best
perfomance.
The control is implemented by estimating the clock phase error in the
RN demodulator on AT-basis and transmitting the AT self-correction
information through an RCL message over the air-interface.
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