Gsm Subsystem - LG -P970 Service Manual

3.9.3 GSM Subsystem

The X-GOLDTM616 is suited for mobile stateons operating in the GSM850/900/1800/1900 band. In the receiver
path the antenna input signal is converted to the base band, filtered, and amplified to target level by the RF
transceiver chip set. Tne modem processor performs for both, GMSK and 8-PSK, the complex baseband signal
equalization with soft-output recovery and the channel decoding supported by a Viterbi hardware accelerator.
• RMS calculation for field strength measurements (monitoring)
• Detection and evaluation of frequency correction bursts (FCB)
• Equalization of GMSK and 8PSK normal bursts as well as synchronization bursts with bit-by-bit soft output.
• Single Antenna Interference Cancellation (SAIC) for GMSK and 8PSK channels.
• Channel encoding and soft-decision channel decoding for all supported GSM/GPRS/EDGE speech,
data and control channels
• Synchonization channel (SCH) and control channels including RACH and PRACH
• FR, HR, EFR speech channels (TCH/FS, TCH/HS, TCH/EFS)
• NAMR/WAMR speech channels over GMSK and 8PSK
• Mandatory sub-functions for speech channels:
– Discontinous transmission (DTX)
– Voice activity detection (VAD)
– Background noise calculation
• Fullrate and halfrate data channels (F14.4, F9.6, F4.8, F2.4, H4.8, H2.4)
• GPRS class 33 support for coding schemes CS1..CS4
• Fast USF detection algorithm for MAC layer
• EGPRS class 33 support for modulation and coding schemes MSC1..MSC9
• Incremental redundancy (ARQ2) for EGPRS
• Dual transfer mode (DTM) class 33
LGE Internal Use Only - 53 - Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
Only for training and service purposes