AI SearchPerformance evaluation of POFDM and VOFDM for OFDM-CDMA wireless networks (Record no. 86662)
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| fixed length control field | 04340nas|a2200469 i 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260818171541.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 030926s2002 th uzm rtt 00| a1eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b11900106 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT RSPR no.TC-02-12 |
| 100 0# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Duong Hien Thuan |
| 245 10 - TITLE STATEMENT | |
| Title | Performance evaluation of POFDM and VOFDM for OFDM-CDMA wireless networks |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Bangkok : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 2002 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 60 leaves |
| 490 1# - SERIES STATEMENT | |
| Series statement | Research studies project report ; |
| Volume/sequential designation | no. TC-02-12 |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Special Studies Project Report (M.Eng.) - Asian Institute of Technology, 2002 |
| 500 ## - GENERAL NOTE | |
| General note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Advanced Technologies |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Orthogonal Frequency Division Multiplexing (OFDM) has been considered as a promising candidate for high data rate transmissions in a frequency selective radio channels due to its robustness against multipath fading and impulse noise. However, the performance of OFDM system may be degraded when inter-symbol interference (ISi) channels have spectral nulls or close to or on fast Fourier transform (FFT) grid. In addition, when ISi channels have many taps, the data rate overhead due to the inse1iion of the cyclic prefix is high. There are two schemes to improve performance of OFDM system over multipath fading channel and to reduce the cyclic prefix, called precoded and vector OFDM (POFDM, VOFDM). In this research study, we will address these schemes. The precoding scheme is simply to inse1i one or more zeroes between each two sets of K consecutive information symbols, although it can be generalized to general form. This precoding scheme may be able to remove the spectral nulls of an ISi channel without knowing the ISi channel. When compared to coded OFDM (COFDM) with the same code rate KIM, the cyclic prefix data rate overhead in POFDM system is reduced M times, and performance improvement is 2-3 dB in a fading channel. Based on the idea of precoder, VOFDM system has been proposed, in which we linearly precode (combine) symbols before they are multiplexed. The design rules for achieving maximum diversity order are provided. When compared to OFDM system, the VOFDM reduces the cyclic prefix K times and offers 4-5 dB gain over a fading channel. From the principle of the promising candidate for high data rate transmission in multi-access environment, OFDM-CDMA, the simulation of combination of POFDM and VOFDM with CDMA are carried out in A WGN and multipath fading channels. The performances of VOFDM-CDMA and POFDM-CDMA offer 4-6 and 2-3 dB gain compared to the conventional OFDM-CDMA for the fading channels, respectively. It is due to inherent advantage of both techniques POFDM, VOFDM and CDMA. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Code division multiple access |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Radio |
| General subdivision | Transmitters and transmission |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Radio frequency |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Fernando, W.A.C., |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Ahmed, Kazi Mohiuddin, |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Erke, Tapio J., |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Viet Nam Post and Telecommunications Corporation (VNPT), |
| Relator term | Scholarship Donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Research studies project report ; |
| Volume/sequential designation | no. TC-02-12 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B08014">http://203.159.5.9/ait-thesis/detail.php?q=B08014</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b11900106 |
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| a | 240503 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 030926 |
| First date, FD (RLIN) | m |
| -- | a |
| -- | u |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 22-AIT Thesis (Replacement) |
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| Koha item type | 40-Archives |
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| Koha item type | 20-AIT Publication |
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| CREATED | CREATED : 2012-03-12 |
| RECORD Id | RECORD # : i12719961 |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type | Cost, normal purchase price |
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| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT RSPR no.TC-02-12 | 30050120552269 | 18/08/2026 | 3 | 18/08/2026 | 22-AIT Thesis (Replacement) | |||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 18/08/2026 | AIT RSPR no.TC-02-12 | 30050120349385 | 18/08/2026 | 18/08/2026 | 40-Archives | ||||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | AIT RSPR no.TC-02-12 | 30050211034318 | 18/08/2026 | 1 | 18/08/2026 | 20-AIT Publication | 50.00 | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 18/08/2026 | AIT RSPR no.TC-02-12 | 30050211023402 | 18/08/2026 | 2 | 18/08/2026 | 20-AIT Publication | 50.00 |