CDM-Qx Satellite Modem

 

 

Revision 5

Summary of Specifications

 

 

MN/CDMQx.IOM

 

 

 

 

 

 

(With two adjacent

BER=10-7

 

 

 

 

carriers, each 7 dB

 

3.1 dB (2.7 dB)

3.1 dB (2.8 dB)

2.6 dB (2.3dB)

higher than the

BER=10-8

 

 

 

 

desired carrier)

 

3.3 dB (2.8 dB)

3.3 dB (2.90dB)

2.7 dB (2.4dB)

TURBO PRODUCT

 

 

Rate 3/4 (Q)

Rate 3/4 (8-PSK)

Rate 3/4 (16-QAM)

CODEC

 

 

Guaranteed Eb/No:

Guaranteed Eb/No:

Guaranteed Eb/No:

Rate 3/4 QPSK

 

 

(typical value in

(typical value in

(typical value in

Rate 3/4 8-PSK

For:

 

parentheses)

parentheses)

parentheses)

Rate 3/4 16-QAM

BER=10-6

 

 

 

 

BER

 

3.8dB (3.4dB)

6.2 dB (5.8 dB)

7.4dB (7.0 dB)

(With two adjacent

BER=10-7

 

 

 

 

carriers, each 7 dB

 

4.1dB (3.7dB)

6.4 dB (6.0 dB)

7.8 dB (7.3 dB)

higher than the

BER=10-8

 

 

 

 

desired carrier)

 

4.4dB (4.0dB)

6.8 dB (6.3 dB)

8.2 dB (7.7 dB)

TURBO PRODUCT

 

 

Rate 7/8 (Q)

Rate 7/8 (8-PSK)

Rate 7/8 (16-QAM)

CODEC

 

 

Guaranteed Eb/No:

Guaranteed Eb/No:

Guaranteed Eb/No:

Rate 7/8 QPSK

 

 

(typical value in

(typical value in

(typical value in

Rate 7/8 8-PSK

For:

 

parentheses)

parentheses)

parentheses)

Rate 7/8 16-QAM

BER=10-6

 

 

 

 

BER

 

4.3 dB (4.0 dB)

7.3 dB (6.6 dB)

8.1 dB (7.7 dB)

(With two adjacent

BER=10-7

 

 

 

 

carriers, each 7 dB

 

4.4 dB (4.1 dB)

7.4 dB (6.7 dB)

8.2 dB (7.8 dB)

higher than the

BER=10-8

 

 

 

 

desired carrier)

 

4.5 dB (4.2 dB)

7.5 dB (6.8 dB)

8.3 dB (7.9 dB)

TURBO PRODUCT

 

 

Rate 17/18 (Q)

Rate 17/18 (8-PSK)

 

CODEC

 

 

Guaranteed Eb/No:

Guaranteed Eb/No:

 

Rate 17/18 QPSK

 

 

(typical value in

(typical value in

 

Rate 17/18 8-PSK

For:

 

parentheses)

parentheses)

 

BER

BER=10-6

 

 

 

 

(With two adjacent

 

6.4 dB (6.0 dB)

9.3 dB (8.9 dB)

 

carriers, each 7 dB

BER=10-7

 

 

 

 

higher than the

 

6.7 dB (6.3 dB)

9.8 dB (9.4 dB)

 

desired carrier)

BER=10-8

 

6.9 dB (6.5 dB)

10.3 dB (9.9 dB)

 

 

 

 

HIGHER-ORDER

 

 

16-QAM Rate 3/4

16-QAM Rate 7/8

 

MODULATION AND

 

 

Viterbi/RS

Viterbi/RS

 

CODING

 

 

Guaranteed Eb/No:

Guaranteed Eb/No:

 

(With two adjacent

 

 

(typical value in

(typical value in

 

carriers, each 7 dB

For:

 

parentheses)

parentheses)

 

higher than the

BER=10-6

 

 

 

 

desired carrier)

 

8.1 dB (7.5 dB)

9.5 dB (9.0 dB)

 

 

BER=10-8

 

8.6 dB (8.0 dB)

10.1 dB (9.5 dB)

 

Plesiochronous/

Selectable size of

1024, 2048, 4096, 8192,

16384 and 32768 bits

 

Doppler Buffer

Size selection is displayed in bytes and milliseconds

 

 

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)

 

 

A–4

Page 182
Image 182
Mocomtech CDM-QX operation manual Higher-Order, Modulation, Coding