- 您現在的位置：買賣IC網 > PDF目錄30713 > L64781 (LSI CORP) SPECIALTY CONSUMER CIRCUIT, PQFP100 PDF資料下載
參數資料
| 型號： | L64781 |
| 廠商： | LSI CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數： | 94/164頁 |
| 文件大小： | 2003K |
| 代理商： | L64781 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁當前第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁
Channel Estimation and Equalization
2-15
2.13 Channel Estimation and Equalization
The output from the common phase-error (CPE) correction block is a
sequence of complex numbers, each describing the signal received on
one of the COFDM carriers. The numbers correspond to values, chosen
from points of the current constellation, which were used to modulate
each carrier at the modulator. Each carrier is received with unknown
amplitude and phase due to the combined effects of:
The channel through which the RF signal has passed (which, in
general, is frequency selective)
Any minor error in the FFT timing window
The purpose of the channel estimation and equalization block is to
correct these effects so that the complex numbers at its output would, if
plotted on an Argand diagram, correspond to points of the transmitted
constellation (for example, QPSK, 16-QAM, or 64-QAM) except for any
superimposed noise or interference.
2.14 Viterbi Metric Assignment and Quantization
The Viterbi metric assignment and quantization block takes in a
sequence of complex numbers, each describing the signal received on
one of the COFDM carriers, after equalization. These are the received
complex numbers chosen at the modulator for the current constellation
points, according to the coded bits to be sent. This block forms Viterbi
metrics (“soft decisions”) for each received bit. The block quantizes these
metrics and passes them on, after reordering in the deinterleaver stages,
to the associated Viterbi convolutional decoder. The use of “soft” rather
than “hard” decisions is vital to obtaining the rugged properties of
COFDM.
2.15 Inner Symbol Deinterleaver
From each received constellation point, the Viterbi metric assignment
block extracts up to six soft decisions. The symbol deinterleaver accepts
one COFDM symbol’s worth of soft decisions and reorders them
l64781.book Page 15 Friday, January 19, 2001 1:28 PM
相關PDF資料 |
PDF描述 |
|---|---|
| L6561 | 0.7 A POWER FACTOR CONTROLLER, PDIP8 |
| L6566ATR | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6605D | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| L6605 | SPECIALTY CONSUMER CIRCUIT, PDIP18 |
| L6660 | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L64782 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:L64782 Single-Chip COFDM Receiver |
| L6480 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping. |
| L64801GC-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| L64801GC-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| L64801GM-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
發布緊急采購，3分鐘左右您將得到回復。