project proposal - diego velandia comentado.pdf
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8/16/2019 Project Proposal - Diego Velandia comentado.pdf
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Data Communications System with Channel Codingvia Space-Time Code Shifting
Project proposal
Velandia C. Diego A. National University of Colombia
Abstract — This document illustrates the basic structure and
parameters proposed to implement as mid-term project for
Wireless Communications class. One of the key points in this
project will be the channel coding scheme, which will contain
both, coding and encrypting system through Space-Time Code
Shifting.
Keywords —
Coding, data, encrypting, Space-Time CodeShif ting, wir eless communi cations.
I. I NTRODUCTION
Space-Time Code Shifting is a theoretical system intendedto bring channel coding and encrypting at the same time. Itsfunctioning goes similar to Quasi-Orthogonal Space-TimeCodes [1] , in wich the symbols constellation changes trhoughtime, between different symbols constellations whosetransitions never pass trough the coordinate origin.
Fig 1. Quasi-Orthogonal Space-Time coding constellation
Space-Time Code Shifting adds to this scheme a variation ofsymbol’s distribution through time, so it will be necessary to
have de decryption seed to properly decode the meaning of
each symbol in the transmission. In simpler words, as anexample, the blue symbol located in the center bottom of Fig1, will not always can be interpreted as the same bit chainevery time it is received.
Channel coding constellation will switch between blue and redone, depending on the n number of the transmission, blue forodd even numbers and red for even numbers. In the otherhand, the association between symbols in the constellation willalso change over time, the new symbol-bit chain associationwill be determined by the transmitter every second,determining the position of S0 symbol and the other ones will
be assigned clockwise. This position will be determined usinga random number generator in the transmitter.
II. MOTIVATION
The Space-Time Code shifting came as a variant of a well-known coding system which is intended to be used in real caseapplications. The upcoming implementation will give a firstglance of its performance and using potential.
One similar application is seem in CDMA coding [2], butin that case code switches between communications sessionsand stays still untill connection is lost .
Proposed Space-Time Code Shifting will not just switch between constellations, but it will also use constellationsrotations and, possibly, other transformations in order to usethe channel coding and decoding scheme as encryption systemas well.
Potential applications lie on almost any data communication
field that requires a certain security grade that can be provided by the proposed channel coding system, such as IP securevoice and data transmitting, banking operations, ATMsystems, etc.
III. PROBLEM STATEMENT AND SPECIFICATIONS
It is required to provide a channel coding scheme in a wirelessdata communications system, so it helps providing, besides the
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coding distribution, an additional of security throughout thecommunications channel.
In this particular case, a P2P data transmission session will besimulated and analyzed. Session to be presented will have thefollowing configuration.
Modulation scheme: OQPSK.
Source coding: Data packet generation. Channel Coding: Space-Time Code Shifting.
In order to verify the correct data reception, a comparingalgorithm will be implemented to determine the percentage oramount of error in the communications session. This number,among other, will determine the performance characteristics ofthe system.
IV. SCHEDULE
The project will have a development time of one month,
finishing on May 24
th
. Activities will have place as follows,with deadlines presented with each item.
Bibliographic review: April 30th Individual module design: May 11th Module testing: May 13th
Module integration and testing: May 22nd Documentation: May 24th
V. PROJECT BUDGET
The successful development of the present project will includethe following associated costs.
I tem Unit cost Amount Total cost
PC rental $ 1.000 80 $ 80.000MatLab License $ 163.240 1 $ 163.240Work time $ 30.000 80 $ 240.000
Total Cost $ 483.240
Table 1. Project budget
Further developments will include a physical implementation.
R EFERENCES
[1] H. Jafarkhani y N. Hassanpour, «Super-Quasi-OrthogonalSpace – Time Trellis Codes for Four Transmit Antennas,»
IEEE TRANSACTIONS ON WIRELESS
COMMUNICATIONS, vol. 4, nº 1, pp. 215-227, 2005.
[2] R. Kwanwoong, P. Yongwan y C. Jeong-Hee,«Performance Analysis of Multicarrier Code SelectCDMA System for PAPR Reduction in MultipathChannels,» JOURNAL OF COMMUNICATIONS AND
NETWORKS, vol. 11, nº 1, pp. 11-19, 2009.
[3] J. Araque, «Wireless Communication 2016-I,» February2016. [En línea]. Available:https://sites.google.com/site/wcommsun20161/. [Últimoacceso: 22 April 2016]
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