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Research and Development (SCOReD), 2010 IEEE Student Conference on

Date 13-14 Dec. 2010

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Displaying Results 1 - 25 of 104
  • [Front cover]

    Publication Year: 2010 , Page(s): c1
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    Freely Available from IEEE
  • [Copyright notice]

    Publication Year: 2010 , Page(s): 1
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    Freely Available from IEEE
  • Main sponsors

    Publication Year: 2010 , Page(s): 1 - 2
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    Freely Available from IEEE
  • Table of content

    Publication Year: 2010 , Page(s): viii - xv
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  • Dual-band bandpass ring filter

    Publication Year: 2010 , Page(s): 1 - 3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (707 KB) |  | HTML iconHTML  

    A topology of a dual-band filter is presented based on a series-combination of two identical ring resonators. The circumference of each ring is equal to one wavelength taken at the center frequency between the two chosen operating frequencies. The control of the filter response in terms of bandwidth and separation between the operating frequencies can be done by varying the impedances of the filter elements which are the ring line impedance and the even- and odd-mode impedances of the coupled lines. The proposed concept is demonstrated through a design of a microstrip dual-band filter operating at 0.9 GHz and 1.8 GHz on epoxy substrate with εr = 5.4 and substrate thickness of 1.6-mm. Experimental results show good agreement with the theoretical analysis. View full abstract»

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  • Examination of human body frequency radiation

    Publication Year: 2010 , Page(s): 4 - 7
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1477 KB) |  | HTML iconHTML  

    This paper discusses the relationship of frequency radiation of the human body. The human radiation of endogenous electromagnetic field in human body is experimentally studied from 33 healthy human subjects. Different parts of the body radiation frequency are investigated separately. Statistical properties of body radiation frequency have been investigated. It is found that human body has different relationship of body radiation between males and females. View full abstract»

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  • Studies of potential carbon coating for high frequency microwave absorber

    Publication Year: 2010 , Page(s): 8 - 11
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (642 KB) |  | HTML iconHTML  

    An electromagnetic (EM) wave absorber is used to absorb the reflected wave that occurs on the wall of the chamber in the anechoic chamber. To date findings show that the construction of the absorber material used for the absorbers, ferrite is in the lead. A survey on materials that can be used as a carbon for the absorber is performed and the best carbon content is a mix of wood. The absorbers are made of elephant board and then coated with carbon. The absorber is measured for 10 GHz frequency. The performances of the designed absorber are compared to commercial absorbers available in terms of the absorption performance. View full abstract»

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  • A free-space method for measurement of complex permittivity of double-layer dielectric materials at microwave frequencies

    Publication Year: 2010 , Page(s): 12 - 15
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (534 KB) |  | HTML iconHTML  

    Two methods for the calculation of complex permittivity of double-layer dielectric materials measured by a spot-focusing free-space measurement system have been developed. Standard materials have been used to test these methods and further works will be carried out on SiO2 wafer. The dielectric constants obtained were close to the published values. The two methods developed are Transmission Method and Metal-Backed Method. The S11, S21, and S22 are measured for Transmission Method, while only S11 is measured for Metal-Backed Method. In both methods, the samples are sandwiched between two Teflon plates which are quarter wavelength at mid-band frequency. Results are reported in the frequency range of 18-26GHz.κ View full abstract»

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  • Sectorization of UHF RFID tags using a steerable phased antenna array

    Publication Year: 2010 , Page(s): 16 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1455 KB) |  | HTML iconHTML  

    The paper presents the development of an RFID antenna array test bed for determining the sector location of a passive UHF RFID tag. The sectorization is achieved by using a 4-element uniform linear phased array of right-hand circularly polarized (RHCP) patch antennas at the receiver, which is also shown to improve the read range of the system. The uniform linear phased antenna array is able to electronically steer a beam with the use of a programmable phase shift network. The phase shifters are able to provide 0° to 180° shifts for each element, thus providing maximum steering angles of +/-20° off broadside. The phase shift network is controlled by a microcontroller with onboard digital-to-analog converters (DAC). A 13-dB low-noise-amplifier stage was also added to compensate for insertion losses in the network. Experiments were performed to characterize the sectorization performance of the system for fixed and moving tags. View full abstract»

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  • Loss behavior of microwave transmission line structures on PZT thin films

    Publication Year: 2010 , Page(s): 21 - 24
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (565 KB) |  | HTML iconHTML  

    This paper presents a continuation of an investigation into the behavior of ferroelectric lead zirconate titanate (PZT) thin films at high frequency through electromagnetic simulation. The electrical characteristics were analyzed on two transmission line (TL) structures namely microstrip (MS) and coplanar waveguide (CPW) built on PZT thin films. The characteristics are studied by investigating the effect of varying the loss tangent of PZT and the width of the transmission lines on the insertion loss of the two TL structures. The length of the line was set at 100 μm and the thickness was 0.1 μm. Different characteristic impedances were set to calculate the difference of width for MS and CPW. The PZT film thickness was 0.5 μm, and the structures were simulated over 1 to 20 GHz. Using εr values of 87 and 112 respectively for MS and CPW found earlier from capacitance measurements, the insertion loss (IL) was computed at 10 GHz for various structures. The variations of tan d were simulated to predict their IL. The results were compared with tan d at δ 0.1 and 0.09 taken from the capacitance measurement for MS and CPW. Results of this study show that the structures exhibit similar performance, with CPW showing the lower loss for all given widths. These results show the viability of using PZT as a new dielectric material for microwave integrated circuits. View full abstract»

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  • Frequency shifting of microstrip ring filter using open stubs

    Publication Year: 2010 , Page(s): 25 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (665 KB) |  | HTML iconHTML  

    Dual-mode microstrip ring filter whose center frequency is shifted to a lower frequency using four additional open stubs is presented. Nevertheless, the shifted dual-mode ring filter has to face an in-band matching problem in its passband response. A possible solution to the problem is proposed by modifying the line impedance of the ring filter. In this paper, a frequency shifting of about 33.33 % of its 3 GHz initial value is implemented for a microstrip ring filter on FR4 substrate. All the filter layouts are presented along with the comparison between the simulation and measured results. View full abstract»

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  • Investigation on data link layer ARQ and HARQ retransmission rates

    Publication Year: 2010 , Page(s): 29 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB) |  | HTML iconHTML  

    This paper, we present a simulation result on retransmission rates of an HARQ (Hybrid Automatic Repeat Request) and pure ARQ schemes at different channel Signal-to-Noise ratio (SNR). We showed that retransmission is improved by as much as 2dB when HARQ was used. It was also shown that HARQ retransmission scheme perform well at lower SNR. The result of this investigation will helps us in the design of an augmented Hybrid Type-II ARQ retransmission scheme. View full abstract»

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  • Tail-biting massey trellis construction for block codes

    Publication Year: 2010 , Page(s): 32 - 36
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (495 KB) |  | HTML iconHTML  

    It was Aditya V. Nori and Priti Shankar's achievement to extend the well-known BCJR and Forney construction algorithms for minimal conventional trellis to tail-biting trellis respectively. In this artical, based on the Massey construction we present an effective and significative algorithm for constructing TB-Massey trellis, a key step in our work is discoverying that in effect V0 = Vn(mod n), where V0 is the vertex set for i = 0 in the trellis. This renews the work of Nori and Shankar in aspect of other noted construction algorithm for minimal conventional trellis. We also show the properties of resultant trellis and discuss its performance by comparing with T-BCJR trellis and T-Forney trellis. View full abstract»

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  • Performance analysis of hybrid ARQ based on convolutional code

    Publication Year: 2010 , Page(s): 37 - 41
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (621 KB) |  | HTML iconHTML  

    This paper proposes a FEC/ARQ integration in retransmission protocol which is an error control scheme investigation based on a convolutional code for data transmission. The integration is known as Hybrid Automatic Repeat reQuest (HARQ). The analysis of the throughput and bit-error rate (BER) performance, according to the different constraint lengths and code rate of convolutional codes on HARQ simulation scheme are presented. A capability of error correction is certainly provided in every (re)transmitted data, and from every transmission or retransmission, the information can be recovered alone if the error correction scheme still capable to correct. In our analysis, the maximum number of retransmissions in HARQ is limited to three. Then, we analyze the impact of average SNR on the throughput. The performance is compared between using HARQ scheme and previous result of FEC scheme only. The simulation is implemented in MATLAB application software environment. View full abstract»

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  • Utilising MIMO for location and positioning in IMT-advanced systems

    Publication Year: 2010 , Page(s): 42 - 46
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1133 KB) |  | HTML iconHTML  

    With the advances of multiple input multiple output (MIMO) technology as one of IMT-Advanced features, it has become feasible to adopt the technology into the mobile location scenario. By exploiting the multipath characteristics of the MIMO system, it is possible to estimate the position of mobile stations (MS) by considering the capability of MIMO to mitigate the non line of sight (NLOS) conditions that deteriorate the accuracy of location estimation. In this paper we developed geometric approach by utilizing the advantages of MIMO system and employ the time of arrival (TOA) as range measurements for improving location estimation. The performance of the proposed method has been evaluated through computer simulation. The results of our simulation demonstrate that the proposed algorithm is significantly more effective in location accuracy than the conventional technique (LLS algorithm) and MIMO antenna configurations can achieve high accuracy for location estimation which meets the Federal Communications Commission (FCC) requirements. View full abstract»

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  • Performance comparison between rectangular and circular patch antenna array

    Publication Year: 2010 , Page(s): 47 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1064 KB) |  | HTML iconHTML  

    This paper described the design of multiple element of microstrip patch antenna array operating at 2.45 GHz for WLAN and 5.85 GHz for WiMAX applications. The design and development also focus on different type antenna such as rectangular and circular patch antennas. Microstrip antennas have the attractive features of low profile and light weight. However the antennas may be too large for practical applications at the lower microwave frequency range and may offer only a few percentage of bandwidth. Computer Simulation Technology (CST) Microwave Studio is used as an effective tool for 3D electromagnetic simulation of high frequency components. A parallel or corporate feed configuration is used to build up the arrays. In parallel feed, the patch elements were fed in parallel with the transmission lines. The transmission lines are divided into two branches according to the number of patch elements. The objective of this project is to develop the antenna that has high gain, directivity and efficiency. Each component of the antenna system is optimized to get the best results. Many factors are considered such as operating frequencies, bandwidth requirements and directivity, all of which affect its efficiency. The analysis on performance will be based on the obtained result especially in radiation pattern, bandwidth and return loss. View full abstract»

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  • Efficient dynamic bandwidth allocation for upstream EPON with global priority

    Publication Year: 2010 , Page(s): 52 - 55
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (844 KB) |  | HTML iconHTML  

    An efficient dynamic bandwidth allocation (DBA) algorithm with global priority is proposed for upstream Ethernet passive optical network (EPON) in this paper. The algorithm is hierarchical and it ensures that the excessive bandwidth is allocated fairly according to the priority. The simulation is done using MATLAB by comparing Efficient DBA with global priority to Efficient DBA with local priority. The results show an improvement as high as 11% in terms of the bandwidth utilization and 46% in terms of the delay. View full abstract»

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  • Live Monitoring System for Ethernet Passive Optical Network health using Fiber Bragg Grating

    Publication Year: 2010 , Page(s): 56 - 58
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (790 KB) |  | HTML iconHTML  

    This paper presented a Live Monitoring System (LMS) for Ethernet Passive Optical Network (EPON) condition. Fiber Bragg Gratings (FBG) with different center frequencies is used as the monitoring devices. Different bit rates, of 2.5 Gbps and 10 Gbps are used as transmission speed. The performance of downstream signal with the monitoring signal propagating in the same fiber is observed. The simulation result shows that the performance of EPON system with 8 users is in acceptable range where transmission distance at bit error rate (BER) 10-9 is 47 km for 2.5 Gbps and 27 km for 10 Gbps system. View full abstract»

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  • Study on the effect of CBR on packet marking in assured forwarding

    Publication Year: 2010 , Page(s): 59 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (613 KB) |  | HTML iconHTML  

    Many research works have been carried out in differentiated Services, to study the fairness issues between aggregates of both TCP and UDP. Due to multimedia demands, the UDP flows can also demand assured service. Hence, there is a need to protect certain UDP flows which require the same fair treatment as TCP. In such cases, the UDP flows are characterized as AS UDP with target rates and are modeled as CBR sources with fixed traffic rate. In such situations, to study the fairness issue, what should be the CB Rate of the traffic is a question. With a goal to enlighten this, simulations have been carried out with fixed target rates and varying CB rates. The simulations are carried out with the time sliding window based two color marker in NS-2 and their corresponding results being furnished. It is inferred that the CBR should be set at a value greater than the target rate of the UDP source to study its performance and fairness issues. View full abstract»

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  • Simulation model and location accuracy for observed time difference of arrival (OTDOA) positioning technique in Third Generation system

    Publication Year: 2010 , Page(s): 63 - 66
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1342 KB) |  | HTML iconHTML  

    In the Third Generation (3G), Location Based Service (LBS) is an important feature of radio networks and plays a significant role in mobile communication. In this paper, detailed analysis is focused on the LDT based on Observed Time Difference of Arrival (OTDOA) positioning technique in 3G system. These positioning methods were chosen as they refer to the three hearability from at least three Node Bs. A simulation model for OTDOA based on the path loss model has been developed and is used to simulate data with fixed input parameters and the RSCP of Node Bs from field drive test. The data collected is from the vicinity of urban areas in Kuala Lumpur. We then analyze and evaluate the location accuracy by using OTDOA techniques with three different path loss models such as Fixing Algorithm, COST231-Okumura-Hata and COST231-Walfisch-Ikegami. Then, the performance of these OTDOA techniques based on the three path loss models is discussed and compared according to the accuracy of location approximation. From the analysis we find out which OTDOA techniques with COST231-Walfisch-Ikegami path loss model has the most accuracy of location approximation with the least location error. View full abstract»

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  • A permutation based technique for channel assignment problem

    Publication Year: 2010 , Page(s): 67 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB) |  | HTML iconHTML  

    Channel assignment problem is an example of NP-complete problem in which the complexity and level of difficulty depends on the input parameters of a particular condition. Therefore, a good technique with an efficient optimization approach will produce a good assignment if not optimum. This paper proposes the use of permutation technique adopted from evolutionary strategy in producing various number of cell orders for channel assignment task. Subject to three different constraints, the objective is to find the minimum number of channels used in order to satisfy various numbers of demands from each cell. The proposed algorithm was tested on standard benchmark problems and the results obtained show the effectiveness of a simple yet efficient algorithm with the help of an improved shift mutation technique that are normally applied in evolutionary strategy. View full abstract»

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  • A framework for automated malcode signatures generation

    Publication Year: 2010 , Page(s): 72 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    Rapid malicious codes (malcodes) are self-replicating malicious programs that represent a major security threat to the Internet. Fast monitoring and early warning systems are very essential to prevent rapid malcodes spreading. The difficulty in detecting malcodes is that they evolve over time. Although signature-based tools such as network intrusion detection systems are widely used to protect critical systems, traditional signature-based malcode detectors fail to detect obfuscated and previously unseen malcode executables. Automatic signature generation techniques are needed to augment these tools due to the speed at which new vulnerabilities are discovered. In particular, we need automated techniques which generate signatures without mistakenly block legitimate traffic or increase false alarms. This work investigates a technique for automatically generating sound vulnerability signatures of novel rapid malcodes. In this paper, rapid malcode signatures are automatically generated based on their spreading behavior, specially aimed at automatically extracting and deploying signatures on the packet level, without the need for reassembly that could be used by signature-based firewalls network intrusion detection system. Evaluation on Universiti Teknologi Malaysia network corpus shows higher detection accuracy at 87% compare to 56% for Snort signatures. Moreover, false negative reduces to 14% compared to 78% for Snort signatures. View full abstract»

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  • A multidrop optical network testbed for EPON platform

    Publication Year: 2010 , Page(s): 77 - 80
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1249 KB) |  | HTML iconHTML  

    In an Ethernet Passive Optical Network (EPON) environment, the Optical Line Terminal (OLT) and Optical Network Unit (ONU) are the main end components that are required for the transfer of data. For the data transmission process, a communication protocol, i.e Multi-Point Control Protocol (MPCP) is required to avoid collision of the data that travel between the OLT and ONU. This paper describes an effort in developing an EPON environment with MPCP for the OLT and ONU communications. A multidrop optical network testbed was developed on a platform intergrated with PIC microcontrollers. Although the microcontrollers have some limitations, the testbed can be used to test out protocols and algorithms for the EPON environment. View full abstract»

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  • Coverage performance analysis of genetic algorithm controlled smart antenna system

    Publication Year: 2010 , Page(s): 81 - 85
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1095 KB) |  | HTML iconHTML  

    In this paper, an innovative type of smart antenna based on genetic algorithm (GA) has been developed and tested. The new GA embedded solution simplifies the control of smart antenna system with increment of the accuracy of beam coverage and decrement of beam availability in compare with the conventional switch beam smart antenna. Scanning antenna of the system determined the location of mobile users through its band passed radio frequency power detector circuitry. GA then operates to optimize and steer the coverage beams to cater for dynamic users' distribution with minimum power usage. The experiment with GA embedded control system smart antenna shows good result in beam formation and steering to handle mobile users. View full abstract»

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  • Improving the performance of hierarchical bandwidth allocation for upstream EPON

    Publication Year: 2010 , Page(s): 86 - 89
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1025 KB) |  | HTML iconHTML  

    Many issues of intra- optical network unit (ONU) bandwidth allocation in Ethernet Passive Optical Network (EPON) remain open. In this paper, we report the performance of hierarchical bandwidth allocation algorithm incorporated Russian Doll Model (RDM) as a solution to allocate bandwidth for intra- ONU in upstream EPON. The allocation of bandwidth is based on the class of service and its priority. Results confirm significant performance improvements for a wide range of traffic loads and triple-play (video, voice, and data) services in terms of the bandwidth utilization, wasted bandwidth and fairness compared with the SHDBA algorithm. The RDDBA maximum significant performance improvements compared to SHDBA is up to 30% depending on the variant and the characteristics of the network traffic. The hierarchical bandwidth allocation with RDM improves the performance of EPON by satisfying the requests of all ONUs and provide differentiated services by guaranteeing both the priority and fairness. View full abstract»

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