AI SearchAdaptive modulation techniques for OFDM-CDMA based 4G mobile networks (Record no. 1615)
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| fixed length control field | 04884nas|a2200469 i 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260817161527.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 030926s2002 th u m rtt 00| a1eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b11900234 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no.TC-02-10 |
| 100 1# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Wasantha, Muthuthanthrige Kumudu |
| 245 10 - TITLE STATEMENT | |
| Title | Adaptive modulation techniques for OFDM-CDMA based 4G mobile 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 | 65 leaves |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis ; |
| Volume/sequential designation | no. TC-02-10 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Ever increasing demand for high speed data transmission with mobility due to the quantum advancement in multimedia applications used in this information era day to day life has created a huge burden on the limited radio frequency bandwidth available for wireless communication. OFDM - CDMA (Orthogonal Frequency Division Multiplexing - Code Division Multiple Access) with adaptive modulation techniques is one of the most promising technologies for high speed data transmission over wireless channels due to its favourable properties to overcome many channel impairments. Quadrature Amplitude Modulation (QAM), Phase Shift Keying (PSK) and Multi-h Continuous Phase Modulation schemes are investigated in this study as adaptive modulation techniques. A pilot symbol assisted channel estimation method is used to estimate the channel quality and to decide the suitable modulation format to meet the targeted Bit Error Rate (BER) of 1 o-04 or better. BER performance of M-ary QAM (M=2, 4, 16), M-ary PSK (M=2, 4, 8) and M-ary MHPM (M=2, 4) modulation schemes in OFDM-CDMA system under different channel conditions and with different number of CDMA users has been investigated and presented in this thesis. In general higher order modulation schemes can accommodate only few number of CDMA users and more noise resilient lower order modulation schemes can support more number of CDMA users. Based on the results of the OFDM-CDMA system with fixed modulation schemes and the corresponding estimated channel CNR, OFDM-CDMA systems with adaptive modulation schemes were simulated. The simulation results show that an adaptive modulation based system can use the available spectrum more efficiently than fixed modulation based system under varying channel conditions while maintaining a targeted BER performance criterion. Further simulation results show that irrespective of modulation scheme i.e., whether QAM, PSK or MHPM, any higher order modulation format need better channel condition than a lower order format to maintain the same BER performance. In poor channel conditions all adaptive systems end up with the lowest order modulation scheme available in the system. There is no specific advantage in terms of BER performance in limiting modulations formats to one category in adaptive systems such as adaptive PSK, adaptive QAM etc., but in terms of hardware and software it is easier to implement such a system than an adaptive system having many different modulation schemes such as QAM, PSK and MHPM. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Modulation theory |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Code division multiple access |
| 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 | Sonera Corporation, Finland, |
| 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 | Thesis ; |
| Volume/sequential designation | no. TC-02-10 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B07561">http://203.159.5.9/ait-thesis/detail.php?q=B07561</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b11900234 |
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| a | 240710 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 030926 |
| First date, FD (RLIN) | m |
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| -- | u |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
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| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 20-AIT Publication |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120810006 |
| CREATED | CREATED : 2002-04-29 |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Cost, normal purchase price | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 17/08/2026 | 50.00 | AIT Thesis no.TC-02-10 | 30050120810006 | 17/08/2026 | 1 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 17/08/2026 | 50.00 | AIT Thesis no.TC-02-10 | 30050120809990 | 17/08/2026 | 2 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | AIT Thesis no.TC-02-10 | 30050160045000 | 17/08/2026 | 17/08/2026 | 40-Archives | ||||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | 50.00 | AIT Thesis no.TC-02-10 | 30050211033492 | 17/08/2026 | 3 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | 50.00 | AIT Thesis no.TC-02-10 | 30050211032403 | 17/08/2026 | 4 | 17/08/2026 | 20-AIT Publication |