International Journal

on Marine Navigation

and Safety of Sea Transportation

Volume 4

Number 2

June 2010

143

1 INTRODUCTION

Serious difficulties exist solving many questions of

the theory of the telecommunicational movement

analytic methods. The way of behaviour can be the

signal one of examples of such problem in the

broadcasting track. Presented questions can real sys-

tem, his physical or simulating paternal be solved by

the observation. He complies first method only in

the limited range because of high costs. He often al-

so wants to become acquainted the motive proprie-

ties of the system being just in the bevel of project-

ing. You should understand the techniques of

solving the problems consisting in the observation

during changes drawing ahead in the dynamic pater-

nal of the system by the simulation.

The creation of paternal brings in many ad-

vantages for the explorer of the system (Filipowicz

1996):

− checking the theoretical courts about system, ac-

complishment on the model of empirical observa-

tions and extraction from these actions of logical

conclusions makes possible,

− the understanding of the system facilitates,

− he makes possible the opinion of the meaning of

the details of the system and the relationships of

boundary strip them,

− the realization of the analysis accelerates,

− he makes up the basis of the opinion of the advis-

ability of the modification of the system,

− it is more easily before to manipulate than the

system,

− the model is, in the general case, expensive the

than system less.

2 SYSTEM DECT FOR SETS PARAMETERS

In the aim of designing the system of DECT for

trans-shipping terminal, you should execute the suit-

able measurements of the field and the conditions of

the propagation of waves on him and work out on

their basis the project of the distribution of the sta-

tion base RFP so that where the ranges of these sta-

tions cover the whole terrain the system DETC has

to function (Jackowski 2005). The result of this

working was introduced on Figure 2.2. Red dots

mark points, where you should place base stations so

that they their range cover the whole terrain. For

considered earlier parameters and it was affirmed for

the given configuration of objects that you should

use 16 base stations. The number of the station

probably underwent the change after executing spe-

cialist measurements. The ideological pattern of the

proposed system was introduced on Figure 2.1.

Public

Net

Trans -Shipping

Terminal

Central

Station

RFP

RWD

Figure 2.1. The scheme of the system of DECT (own study)

The Transmission of the Information of the

System of Telecommunicational Dect in the

Trans-Shipping Terminal

A. Kusminska-Fijalkowska & Z. Lukasik

Technical University of Radom, Radom, Poland

ABSTRACT: Introduce the concrete project of the distribution of base stations in the article

and propose the architecture of the system DECT of the trans-shipping terminal. The simulation of the sys-

tem of DECT which was limited only to the broadcasting track from the transmitter to receiver set was real-

ized he walks about examining the quality of the radio broadcast between the base station, and the station

movable. It was accepted as the criterion of the quality the bit error ratio (BER) during the of sending given

broadcasts.

Figure. 2.2 . The plan of the distribution of base stations and their radio ranges in the trans-shipping terminal (Kuśmińska- Fi-

jałkowska 2008)

It is the most suitable system to put earlier pa-

rameters the multicellular system of the contact ra-

dio Hicom cordless E. The system integrated of

wireless contact co-operating with central stations

ISDN Hicom 300 E and Hicom 300. The architec-

ture of the system and digital broadcast leaning on

the standard of DECT guarantee the free contact in

buildings and their surroundings. Stations base RFP

are added for the help of digital interfaces to inte-

grated with central station modules. He possible is

thanks to this projects and carries out the installation

of the system of the radio, optimum contact under in

relation to costs, area of range and users (PP) num-

ber (Figure 2.4). He assures apparatus Gigaset 3000

(PP) roaming between various systems and lets use

the function of central station Hicom 300 / 300 E.

System will make possible constructs connections

and receiving developments on the whole terrain the

covered radio range.

Figure. 2.3. Base stations P-2302HWUDL-P1

Figure. 2.4. The wireless receiver (PP)

Base stations create radio mobile phones for the

needs of the wireless contact on the area trans-

shipping terminal. They convert the radio signal on

the signals of the interfaces of DECT and WLAN in-

tegrated with central station base ISDN 300/300 E.

They can be reinforced from her or from the external

source of the voltage. The location of base stations is

defined after executing the measurements of the

field and radio conditions and worked out on their

basis of project (Figure 2.2). (Łukasik 2007)

Proposed device (base station) this P-2302

HWUDL-P1 (Figure 2.3), which WLAN is equipped

in the interface Ethernet 10/100 Mbps, working in

the standard 802.11b / g and two the port USB the

enabling facility in the net of the printer or memory

of the mass VIP possesses the integrated gate with

the base station for the receivers of DECT (PP).

145

3 THE SIMULATING MODEL OF THE

SYSTEM BROADCAST SIGNALS OF

DIGITAL

The simulation will be conducted in the programme

Matlab Symulink, he will be realized only for cho-

sen his part. She oneself will base on examining the

quality of the radio broadcast between the base sta-

tion, and the movable station (PP).

The bit error ratio was accepted as the criterion of

the quality during the of sending given broadcasts

(Wesołowski 2003) The simulation will be conduct-

ed for three variants:

1 The movable station is inside the building.

2 The movable station is beyond the building and

moves with the maximum speed even 5 km / h.

3 The movable station is the building outside and

moves with the average speed even 20 km / h.

The pattern of the measuring arrangement of the

bit error ratio (BER) for the chosen part of the sys-

tem was introduced on Figure 3. 1. He will look for

the various variants of the simulation, only parame-

ters of the radio track will change. The effect Dop-

pler will not be taken into account in first case, and

only hums introduced through channel and phenom-

enon multiways of the signal. The phenomenon

Doppler was considered in the next case for the set

speed. These alone phenomena will be considered in

the last case, what in second case with this, that the

phenomenon Doppler will play the significant part.

He is on the entry of the arrangement passed the

random binary draught from the generator Bernoulli.

Probability of the pronouncement 0 and 1 carries

out 0,5.

The draught crosses from the generator to the en-

coder the channel, which complies to improve or,

what the least affirm of the existence of mistakes in

the binary sequence. Informative bits are replenished

about certain quantity of suitably well-chosen addi-

tional bits 2 chosen informative bits beaten these are

the sum the modulo. Algebraical dependences come

into being among bits in the sequence in such way

so that the error of some lets on reproducing the

original sequence been useful from them in this way.

The signal is steered to the modulator GMSK then.

The modulator is the arrangement generates the sig-

nal modulate, whose parameters such as the fre-

quency, amplitude and bevel are the function passed

on his entry of the binary draught. Thanks to what

the signal carrying information binary is placed in

the proper strand of the frequency and has the

shaped spectrum suitably. The radio signal after

passing through the channel grinds in to the receiver

set which consists of these alone blocks what the

transmitter, but every block realizes the opposite

function than in the transmitter. The block „Rician

Fading Channel” was applied for first case of the

simulation in the radio channel. White gaussian

noise adds block this the hum to the entrance signal

and the multiways of the signal takes into account.

One can skip the phenomenon Doppler in the build-

ing.

The small frequency Doppler was considered in

second piece of the simulation in the radio channel.

Simulating arrangement for third case differs from

second these that the maximum shift Doppler carries

out 35 Hz (for the of the station of the movable-cart

jacks even speed 20 km/h), it carried out ap-

prox. 7 Hz in the previous case where.

Figure. 3.1. The pattern of arrangement to the measurement of the bit error ratio (own study)

BER:

Using Hard Decisions

HARD DECISIONS

GMSK DEMODULATOR

GMSK MODULATOR

Double-click on

the block

to open the scope

Viterbi Decoder

Rst

Viterbi Decoder

Unipolar to

Bipolar

Converter

Unipolar to

Bipolar

Converter

Rotation

Factor

Rician

Fading

Rician Fading

Channel

Pulse Generator

Complex

Phase Shift

Phase Rotator

DF FIR

Num

Out

Matched Filter

Quantizing

Encoder

Idx

Q(U)

Hard Decisions

Device

Gaussian

Gaussian Filter

GMSK

Modulator

Baseband

Error Rate

Calculation

0.000000000000000e+000

In1 Out1

Differential

Input

-5

Convolutional

Encoder

Convolutional

Encoder

Re(u)

Bernoulli

Binary

Bernoulli Binary

Generator

Coded BitsBits

Tx Signal

146

Figure 3.2. Dependence BER in the function

Figure 3.3. Dependence BER in the function of the speed of the movable station

1,00E-08

1,00E-07

1,00E-06

1,00E-05

1,00E-04

1,00E-03

1,00E-02

1,00E-01

1,00E+00

1 2 3 4 5 6 7 8 9 10 11 12 13

BER

Eb/N0 [dB]

in the building in the free space by v=0 in the free space by various v from zero

1,00E-08

1,00E-07

1,00E-06

1,00E-05

1,00E-04

1,00E-03

1,00E-02

1,00E-01

1,00E+00

0,0 5,0 10,0 15,0 20,0 25,0 30,0 35,0 40,0

v [km/h]

BER

Eb/N0 = 12 dB Eb/N0 = 10 dB

147

3.1 Got results

Changing the values

was noted down the

value of the bit error ratio. She was different for var-

ious

. Dependences what were got it was in-

troduced on Figure 3. 2.

The next stage of the simulation is the measure-

ment of the bit error ratio in dependence from the

speed of the mobile station. This was realized chang-

ing the frequency Doppler which answers the value

of the speed near the solid value

. Enumer-

ated speeds were introduced in Table 3. 1. for the

chosen frequencies Doppler which was used during

the simulation.

Table 3.1. The counted values of the speed for chosen frequen-

cies Doppler

___________________________________________________

Frequencies Doppler Speed

[Hz] [km/h]

___________________________________________________

0 0,0

5 3,1

10 5,7

15 8,5

20 11,4

25 14,2

30 17,1

35 19,9

43 24,4

47 26,5

48 27,5

60 34,1

___________________________________________________

4 CONCLUSIONS

Could was the system of the wireless contact leaning

on this standard design, the hypothetic plan of the

distribution of objects was created on the terrain

trans-shipping terminal. It was considered in the

structure terminal that the system of the exchange of

information (DECT) should function inside objects,

in the free space (the article pt. „Propagation FEM

on areas about the folded architectural structure the

trans-shipping terminal„) and during subscribers

movement mechanical vehicles (Gate Gantry, Sisu).

Wanting approach to the distribution of base stations

on the introduced plan trans-shipping terminal ana-

lyze propagation FEM and qualify the ranges of base

stations inside objects how and on the free space. In-

troduce the concrete project of the distribution of

base stations after qualifying maximum ranges and

propose the architecture of the system of DECT in

the trans-shipping terminal. The aim of the verifica-

tion of the correctness of functioning of the pro-

posed system of DECT, the realized simulation was

introduced in the programme Matlab Symulink.

In first variant of the simulation changing the

values E

/ N

was noted down the value of the bit er-

ror ratio. She was different for various

. De-

pendences what were got they are introduced on

Figure 3.2. According to the recommendations of

the standard of DECT the bit error ratio, for

= 10 dB, he should carry out 10

-5

, and the sill timber

of the receipt finds oneself in BER = 10

-3

(Kuśmińska-Fijałkowska 2008). As one can read

value this from Figure 3.3. for conditions in the

building he carries out approx. 10

-5

and together

with the growth

diminishes quickly. How-

ever for second case, i.e. on the open space, the val-

ue of the bit error ratio grew up considerably and

carries out for 10 dB 10

-4

. This caused these is, that

the distance of between the transmitter, and he is the

receiver set considerably larger than in buildings

and the worsened quality of the receipt of the data

becomes. Third value of the bit error ratio was in the

variant approx. 10

-3

. Value this in the comparison

from previous he is considerably worse, but he still

is comprises in the foundations of the standard. The

result which was got was caused these, that she was

considered the maximum frequency Doppler, which

as you can see, the quality of the broadcast worsened

considerably. It is also with the phenomenon Dop-

pler connected the maximum speed of movable sta-

tions in the system of DECT.

One can find in the foundations of the standard of

DECT, that the maximum speed of movable stations

should not cross 20 km/h (Jackowski 2005). This

caused these is, that for such fluxation he which of-

fers DECT, shift larger Doppler than 35 Hz cause

that the bit error ratio is not to the party by the

standard and is comprises not in the sill timber of

detection. max the speed of movable stations carries

out 10 km / h in the case terminal. On Figure 3. 3.

was introduced. the dependence of the bit error ratio

in the of the speed of the station movable function.

The simulation was conducted for two values

= const. In first case the value

even 12 dB. As one can notice the bit error ratio

even 10

-3

on Figure 3. 3. it was got for the speed car-

rying out almost 25 km/h. He is caused this, that the

relation of energy falling on the single bit to the

spectral thickness of the power of the white hum ad-

ditive he is enough large and can thanks to this get

the larger speed

= 10 dB was accepted in

case second. As one can notice the bit error ratio is

considerably worse in comparing with the previous

profile for every speed. For BER carrying out 10

-3

the speed of the station of movable carries out ap-

prox. 20 km/h. it would be the One from the ways of

the enlargement of the maximum speed e.g. decrease

of the fluxation of the system, like e.g. the enlarge-

ment of

. However one can not do this, be-

cause standard this was created for the assurance of

the contact inside buildings, and not for movable sta-

tions moving with large speeds.

Results what were received, they could insignifi-

cant changes undergo near the investigation of the

148

real system. This would be caused these that only

several phenomena what had taken into account dur-

ing the simulation they draw ahead in real radio

tracks. The received results of measurements fulfil

the standards of the standard of DECT, he infers

from here that the designed earlier system of the

contact will work according to foundations:

− he will assure the continuous understanding con-

tact on the area of the dislocation terminal;

− he will make possible the realization of the digital

summary contact of the short packets of infor-

mation from the any object being on the terrain

terminal;

− the sharp the tuning two-way socket will assure

with external users both understanding as and in

the figure of short telegrams, from the any exter-

nal system;

− the information will be exchanged in the system

of the contact protected before the access to her

persons unentitled.

System DETC in the trans-shipping terminal will

bring workers full mobility through shortening the

time of the reaction, raise efficiency simultaneously,

reduce costs and enlarging receipts trans-shipping

terminal.

LITERATURE

Filipowicz B.: „Stochastic patternel in operating investiga-

tions”, WNT, Warsaw 1996

Jackowski S.: „Telecommunication”, cz.1, 2. Technical Uni-

versity of Radom 2005

Łukasik Z., Kuśmińska A.: „Intermodal transportation in the

processes of the flow of cargos” stage III, Technical Uni-

versity of Radom 2007

Kuśmińska- Fijałkowska A.: „Modified method of trans-

shipping processes of intermodal Units transports in the

land terminal” Technical University of Radom 2008

Wesołowski K.: „ Radio systems telecommunication of mova-

ble”, WKŁ, Warsaw 2003