参数资料
型号: L64781
厂商: LSI CORP
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封装: PLASTIC, QFP-100
文件页数: 75/164页
文件大小: 2003K
代理商: L64781
1-6
Introduction
Soft decision for high- or low-priority external FEC decoder
Capability to strobe different points into the L64781 demodulator for
test and debug purposes
Capability to extract by software the equalized constellation and the
channel response
Three general-purpose outputs programmable through registers
Easy connection to the L64118
1.6 Typical Performance
Figure 1.3 illustrates the target performance of the L64781 compared to
the simulation results in the ETSI specication for all the nonhierarchical
modes in a Gaussian channel. Differences between the target
performance and the simulations are accounted for as follows:
About 1.5 dB for the noisy reference effect in the channel equalizer
0.1–0.3 dB for noise on the channel state measurement
It is not possible to be specic about the source of the remaining small
difference (about 0.4 dB) because we do not have enough information
about the conditions under which the simulations were performed.
The two losses (in the channel equalizer and channel state information)
are compromises made in the interests of the speed of tracking of a time-
varying channel. Sacricing the tracking ability reduces the losses.
l64781.book Page 6 Friday, January 19, 2001 1:28 PM
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