Mocomtech CDM-QX User Manual

Page 41

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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision

7

Introduction

MN/CDMQx.IOM

1–17

TURBO PRODUCT
CODEC

Rate 7/8 QPSK

Rate 7/8 8-PSK

Rate 7/8 16-QAM

BER

(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)




For:

BER=10

-6


BER=10

-7


BER=10

-8

Rate 7/8 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)

4.3 dB (4.0 dB)

4.4 dB (4.1 dB)

4.5 dB (4.2 dB)

Rate 7/8 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)

7.3 dB (6.6 dB)

7.4 dB (6.7 dB)

7.5 dB (6.8 dB)

Rate 7/8 (16-QAM)
Guaranteed Eb/No:
(typical value in
parentheses)

8.1 dB (7.7 dB)

8.2 dB (7.8 dB)

8.3 dB (7.9 dB)

TURBO PRODUCT
CODEC

Rate 17/18 QPSK

Rate 17/18 8-PSK

BER

(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)




For:

BER=10

-6


BER=10

-7


BER=10

-8

Rate 17/18 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)

6.4 dB (6.0 dB)

6.7 dB (6.3 dB)

6.9 dB (6.5 dB)

Rate 17/18 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)

9.3 dB (8.9 dB)

9.8 dB (9.4 dB)

10.3 dB (9.9 dB)

HIGHER-ORDER
MODULATION AND
CODING

(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)





For:

BER=10

-6


BER=10

-8

16-QAM Rate 3/4
Viterbi/RS
Guaranteed Eb/No:
(typical value in
parentheses)

8.1 dB (7.5 dB)

8.6 dB (8.0 dB)

16-QAM Rate 7/8
Viterbi/RS
Guaranteed Eb/No:
(typical value in
parentheses)

9.5 dB (9.0 dB)

10.1 dB (9.5 dB)

Plesiochronous /
Doppler Buffer

Selectable size of 512, 1024, 2048, 4096, 8192, 16384 and a32768 bits
Size selection is displayed in bytes
Supports asymmetric operation - when buffer is clocked from Tx clock, Rx and Tx rates do
not need to be identical

Monitor Functions

Eb/No estimate, 2 to 16 dB (

± 0.10 dB accuracy)

Corrected Bit Error Rate, 1E-3 to 1E-10
Frequency offset,

± 32 kHz range, 100 Hz resolution (70/140 MHz IF)

Frequency offset,

± 200 kHz range, 100 Hz resolution (L-Band)

Buffer fill state, in percent
Receive signal level accuracy =

± 3.0 dB)


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