臺灣博碩士論文加值系統

　　摘要
　　本論文探討車用無線通道, 可預估無線通訊系統在車用時的效能, 利用情境訊號強度參數, 使手持式產品可在車內使用時的情況得以評估 。
傳統上, 在研究待測物的效能時, 常使用測試天線與待測物品上的天線並且使兩物連結之, 找出待測物在特定環境上之訊號強度, 其為最常見之方式之一。 於此吾人以為反推則可得到環境之通道模型于分析測試結果後。 此外, 瑞雷衰減與雷迅衰減是兩種基本的通道衰減形式以表現視距與非視距傳輸之環境。 本論文將以全球衛星定位系統探討頻率於1575.42百萬赫時之訊號強度以視距在車內傳輸之研究。 且於加入情境訊號強度參數後評估待測物之效能。 也將在第三章第二節介紹蜂巢電信與互連網協會所定訂之測試方法, 並以此法找出近場效應對待測天線效能之影響, 使之用以評估車內使用之效能。
情境訊號強度參數是一組補償之值, 當其待測天線受環境所影響之時, 則其效用始能發揮。 近年以來, 手持式產品日漸受到歡迎, 加入近場之影響對其通道效能的評估能達到更精確之目的。

Abstract
This thesis investigates the car-based channel model to evaluate the wireless performance for handheld device in the open space by adding a factor from the “Scenario Signal Strength” method.
Traditionally using the test equipment with antenna and “DUT(Device Under Test)” to find out the value of the signal strength is the most popular method to find out the DUT performance in the specific test environment. By using this method we can find out the relationship between the channel model and our test environment after analysis the test results. Rayleigh fading distribution and Rician fading distribution are the basic types for the LOS and none LOS environment. We will use the Global Position System for the 1575.42MHz signal strength research in LOS put the device in a car. In this thesis, we will use a “Scenario Signal Strength” method for the AUD performance estimation. We will introduce the CTIA test program in Chapter3.2 and we will test the AUT performance in a CTIA approved 3D chamber, and then provide several models to simulate the near field affection for the AUD. We can provide several different factors to compensate the near field affection for the antenna when we do the performance test in the car.
“Scenario Signal Strength” factor is a compensation value for channel model when the antenna in the user equipment is impacted by the environments. In recent years the handheld product is more and more popular for people. The concept that adds the near field affection for a channel model is helped to have a more accurate value for evaluation.

Contents:
Chinese Abstract- ------------------------------------------------------i
Abstract-----------------------------------------------------------------ii
Contents----------------------------------------------------------------iv
Figure List--------------------------------------------------------------vi
Table List----------------- --------------------------------------------viii
Chapter1 Introducti on-------------------------------------------------1
1.1 Background------------------- ---------------------------------1
1.2 Main Results---------------------------------------------------9
1.3 Organization of This Th esis---------------------------------13
Chapter2 Technology Background--------------------------------- --14
2.1 Fading------------------------------------------------------------14
2.1.1 Introduction of f ading------------------------------------14
2.1.2 Large-scale Fa ding--------------------------------------- 18
2.1.3 Small-scale Fa ding--------------------------------------- 20
2.2 Car-based Channel Model----------------------------------- ---22
2.2.1 Path Loss Model ----------------------------------------22
2.2.2 Path Loss Evaluation in Car---------------------------26
2.3 Global Position System-----------------------------------------28
Chapter3 Scenario Signal Strengt h Method for Channel Model--30
3.1 CTIA Test Progr am ---------------------------------------- ----30
3.2 Scenario Signal Strength Factor for Channel Model--------3 5
3.3 GPS Device Performance Test Result-------------------------40
Chapter 4 Conclusions and Further Research--------------------- --45
Reference -------------------------------------------------------------47


Figure List:
1.1 2 Ways communication sy stem application------------------3
1.2 The limitation of the dista nce between the transmitter to t he
receiver-------------------- --------------------------------------------7
2.1 The received signal from the base-station, and the first ar rived
signal to the receiver is LOS signal--------------------------- -16
2.2 An OFDM wireless communicat ion system tested performance
in the environment with multi -path fading for 3 meters
distance test resul t------------------------------------------------21
2.3 path loss distribution wh en the distance between the
transmitter and receiver from 0 to 100 meters-----------------2 3
2.4 The simulation result from t he equation (2.5) and the test
result --------------------------------------------------------------24
2.5 The test horn antenna setup for the signal measurement for the
path loss-----------------------------------------------------------24
2.6 The height of th e DUT-------------------------------------- -----25
2.7 The simulation reault compare to the test result with virti cal
polarization antenna gain of the device----------------------27
2.8 Satellite around th e earth----------------------------------------29
3.1 Great circle cut-------------------------------------------------31
3.2 Conical cut------------------------------------------------------31
3.3 Coordination system and meas urement antenna polarization
--------------------------------- ------------------------------ ----------32
3.4 Coordination system and meas urement antenna polarization
--------------------------------- ------------------------------ ----------33
3.5 Sδ 2 Handheld device is vertical t o the copper plane in the
CTIA test environmen t-------------------------------------------35
3.6 Handheld device is horizont al to the copper plane---------- -36
3.7 Radiation pattern test ed in CTIA chamber in Sδ 1 for vertical
polarization--------------- ----------------------------------------36
3.8 Radiation pattern test ed in CTIA chamber in Sδ 2 for vertical
polarization--------------- ----------------------------------------36
3.9 Radiation pattern test ed in CTIA chamber in Sδ 3 for vertical
polarization--------------- ----------------------------------------37
3.10 Add the free space antenna ver tical polarization gain -5.2 5
dBi for the test result in Table (2.1)------------------------- --38


3.1 Great circle cut-------------------------------------------------31
3.2 Conical cut------------------------------------------------------31
3.3 Coordination system and meas urement antenna polarization
--------------------------------- ------------------------------ ----------32
3.4 Coordination system and meas urement antenna polarization
--------------------------------- ------------------------------ ----------33
3.5 Sδ 2 Handheld device is vertical t o the copper plane in the
CTIA test environmen t-------------------------------------------35
3.6 Handheld device is horizont al to the copper plane---------- -36
3.7 Radiation pattern test ed in CTIA chamber in Sδ 1 for vertical
polarization--------------- ----------------------------------------36
3.8 Radiation pattern test ed in CTIA chamber in Sδ 2 for vertical
polarization--------------- ----------------------------------------36
3.9 Radiation pattern test ed in CTIA chamber in Sδ 3 for vertical
polarization--------------- ----------------------------------------37
3.10 Add the free space antenna ver tical polarization gain -5.2 5
dBi for the test result in Table (2.1)------------------------- --38

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