scholarly journals Efficient VLSI Huffman encoder implementation and its application in high rate serial data encoding

2017 ◽  
Vol 14 (21) ◽  
pp. 20170976-20170976
Author(s):  
Rongshan Wei ◽  
Xingang Zhang
Keyword(s):  
High Rate ◽  
Data Encoding ◽  
Serial Data

scholarly journals A Comparative analysis of OFDM based Communication using different Mapping Schemes for Signal Modulation

2014 ◽  
Vol 12 (10) ◽  
pp. 3952-3961
Author(s):  
Nasir Mahmood ◽  
Muhammad Khalil Shahid ◽  
Ali Saeed
Keyword(s):  
Comparative Analysis ◽  
High Rate ◽  
Single Frequency ◽  
Ofdm Systems ◽  
Channel State ◽  
Pilot Allocation ◽  
Serial Data ◽  
Modulation Techniques ◽  
Parallel Streams ◽  
Better Than

OFDM is a multiplexing technique that is used to divide a frequency spectrum into sub-carriers that are orthogonal to each other. They are capable to carry high rate data transmission. The orthogonality is maintained by keeping one sub carrier, null on the centre of other sub carriers. Sub-carriers have cyclic prefix which is placed in between them and the bandwidth wastage due to guard band is reduced up to 50%. Spectral efficiency is of OFDM is far better than other frequency modulation techniques due to othrognality. Additionally, CP design helps in better diversity gain. The data is dispensed as sub-streams among sub carriers and each of the sub carrier is modulated as per the coding (PSK, BPSK, QAM). Thus rather modulating whole data stream over a single frequency, sub carriers are allocated portions of data that ensure large amount of data processing. To ensure orthogonality, serial data is converted into smaller parallel streams and are fed to IFFT module, after which P/S conversion is performed and CP is inserted between the sub-carriers. The reverse of these steps happens in the receiving module. Important aspects of OFDM systems are, Synchronization, Pilot allocation,the Channel State Information or Channel estimation etc. However this paper takes up sub-carrier modulation techniques in OFDM systems and puts a comparative analysis of them.

scholarly journals High Rate Wave-pipelined Asynchronous On-chip Bit-serial Data Link

2007 ◽  
Author(s):  
Rostislav Reuven Dobkin ◽  
Yevgeny Perelman ◽  
Tuvia Liran ◽  
Ran Ginosar ◽  
Avinoam Kolodny
Keyword(s):  
High Rate ◽  
Data Link ◽  
Serial Data ◽  
On Chip ◽  
Bit Serial

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Rapid Freezing of Freeze-Etch Specimens

1980 ◽  
Vol 38 ◽  
pp. 752-755
Author(s):  
A. Elgsaeter ◽  
T. Espevik ◽  
G. Kopstad
Keyword(s):  
Low Temperature ◽  
Metal Surface ◽  
Relative Velocity ◽  
Thermal Contact ◽  
High Rate ◽  
Rapid Freezing ◽  
Temperature Decrease ◽  
Freeze Etching

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.

Why the high rate of dropout from individualized cognitive-behavior therapy for bulimia nervosa?

2001 ◽  
Author(s):  
Z. Steel ◽  
J. Jones ◽  
S Adcock ◽  
R Clancy ◽  
L. Bridgford-West ◽  
...  
Keyword(s):  
Bulimia Nervosa ◽  
Behavior Therapy ◽  
Cognitive Behavior Therapy ◽  
High Rate ◽  
Cognitive Behavior

Pruned-trellis search technique for high-rate convolutional codes

1989 ◽  
Vol 136 (5) ◽  
pp. 405 ◽  
Author(s):  
J. Sun ◽  
I.S. Reed ◽  
H.E. Huey ◽  
T.K. Truong
Keyword(s):  
Convolutional Codes ◽  
High Rate ◽  
Search Technique
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