HDM8513 datasheet(56/67 Pages) HYNIX

56 / 67 page

In-Phase

The eight bit output of the In-phase baseband filter is available at this

location. This data is updated once per symbol.

Quadrature

The eight bit output of the quadrature baseband filter is available at this

location. This data is updated once per symbol.

Noise Power

This eight bit output provides a measure of the noise component of the

signal when QPSK lock is achieved. Higher numbers correspond to lower

signal-to-noise ratio conditions. The quality of this metric is improved if

the narrowband AGC is disabled for a minimum of 1000 symbol periods

before this parameter is read.

0E, 0F

BER Calculator

The current value of the 16bit BER is used to monitor the signal quality or

estimate the SNR of incoming signal at the output of Viterbi. Bit 7 of

address 0E is the MSB and bit 0 of address 0F is the LSB. It represents

the number of errors among 2

20 data bits.

16,17,18

Signal Quality

This 24 bit signal provides a measure of quality of the signal processed by

the Viterbi decoder. This parameter can be used to infer bit error rate and

input signal-to-noise ratio for signals which are within a few dB of threshold.

Bit 7 of address 16 is the MSB and bit 0 of address 18 is the LSB.

The specific definition of this signal for each coding rate is TBD.

Viterbi Rate

This three bit number represents the code rate of the Viterbi decoder.

Rate 1/2

Rate 2/3

Rate 3/4

Rate 5/6

Rate 7/8

Reed Solomon Errors

The four bit number at this location indicates the number of errors

corrected in the most current block of 188 bytes. This number may range

from 0 to 8.

HDM8513 Folha de dados(PDF) 56 Page - Hynix Semiconductor