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參數(shù)資料
| 型號(hào)： | AD20MSP415 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Circular Connector; No. of Contacts:79; Series:LJTPQ00R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:21; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle |
| 中文描述： | SPECIALTY TELECOM CIRCUIT |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大小： | 66K |
| 代理商： | AD20MSP415 |
AD20msp415
–2–
REV. 0
ARCHIT E CT URE OVE RVIE W
Analog Devices and T he T echnology Partnership (T T P) pro-
vide a cost effective and proven method of attaining the baseband
processing subsystem and protocol stack software. T his data
sheet includes functional descriptions of the baseband process-
ing subsystem and the Protocol Stack Layer 1. T he T echnology
Partnership can provide licenses to software and reference de-
signs in all areas of a GSM handportable terminal.
For detailed information about the individual chipset compo-
nents, please refer to the AD6421 (VBC) and AD6422 (GSMP)
data sheets for electrical characteristics and timing information.
FUNCT IONAL DE SCRIPT ION
Figure 1 is a functional block diagram of the GSM baseband
processing chipset. T he chipset can be viewed as a functional
block that contains a number of discrete functional units. T he
electrical and functional interfaces to the rest of the system are
briefly described at the end of this section and described in
detail in the individual data sheets for each component.
ADC
SPEECH
ENCODE
INTER-
ENCRYPT
DAC
SPEECH
DECODE
DLEAVE
DECRYPT
EQUALIZER
BAADC
CONTROL + MMI + I/O
VBC
GSMP
BADAC
Figure 1. Functional Block Diagram
Uplink
T he uplink baseband processing functions include the following
operations:
Analog-to-Digital Voice Conversion (VBC)
A conventional microphone, connected directly to the VBC,
provides an analog input signal to the ADC. T he analog voice
signal is sampled at 8 kHz, producing 13-bit linear values corre-
sponding to the magnitude of the input. T he ADC includes all
required filtering to meet the GSM specifications. T he sampled
voice data is passed to the GSMP through a dedicated serial
port.
Speech E ncoding (GSMP)
T he GSMP receives the voice data stream from the VBC and
encodes the data from 104 kb/s to 13 kb/s. T he algorithm used is
Regular Pulse Excitation, with Long T erm Prediction (RPE-
LT P) as specified in the 06-series of GSM Recommendations.
Channel Coding (GSMP)
T he information received from the speech coder contains param-
eters that have different levels of priority. T hese are protected to
different levels within the channel coding. T he encode protec-
tion process incorporates block coding and convolutional
encoding. In addition to the normal speech traffic channels, the
channel coding function also supports data transmission at full
rate and half rate. After the interleave process (if necessary) the
data is encrypted using the required A5/1 or A5/2 encryption
algorithm. Data is then formatted into bursts, with the required
timing and training sequences, and sent to the VBC through a
dedicated serial port.
GMSK Modulation and D/A Conversion (VBC)
T he VBC receives data at 270 kb/s. T he VBC uses an on-chip
lookup table to perform GMSK modulation. A pair of 10-bit
matched differential DACs convert the modulated data and pass
I and Q analog data to the transmit section of the radio subsystem.
Downlink
T he downlink baseband processing functions include the follow-
ing operations:
Analog-to-Digital Conversion (VBC)
T he receiver I and Q signals are sampled by a pair of ADCs at
270 kHz. T he I and Q samples are transferred to the GSMP
through a dedicated receive path serial port.
E qualization (GSMP)
T he equalizer recovers and demodulates the received signal and
establishes local timing and frequency references for the mobile
unit as well as RSSI calculation. T he equalization algorithm is a
version of the Maximum Likelihood Sequence Estimation (MLSE)
using the Viterbi algorithm. T wo confidence bits per symbol
provide additional information about the accuracy of each deci-
sion to the channel codec’s convolutional decoder. T he equal-
izer outputs a sequence of bits including the confidence bits.
Channel Decoding (GSMP)
Data is decrypted as required, using the A5/1 or A5/2 decryption
algorithm prior to the deinterleave process. T he deinterleave
process is an exact inversion of the interleave process used by
the transmit section. T he decode function then performs convo-
lutional decoding and parity check. T he convolutional decoder
uses a Viterbi algorithm, with two soft decision confidence bits
supplied by the equalizer. Error control mechanisms are used to
ensure adequate bad frame indication.
Speech Decoding (GSMP)
Encoded speech data is transferred at 20 ms intervals in blocks
of 260 bits plus the Bad Frame Indicator (BFI). T he speech
decoder supports a Comfort Noise Insertion (CNI) function
that inserts a predefined silence descriptor into the decoding
process. T he GSMP also implements control of talker side-tone
and short term echo cancellation. T he resulting data, at 104 kb/s,
is transferred to the VBC through a dedicated serial path.
Voice Digital-to-Analog Conversion (VBC)
T he Voice DAC function of the VBC operates at 8 kHz and
includes all the needed filtering. T he analog signal can be con-
trolled in volume and directly drive a small earpiece as well as a
separate auxiliary output.
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