No description available.

In this thesis, we consider the uplink of a cooperative code division multiple access (CDMA) network, where users cooperate by relaying each other¡¦s messages to the base station. The sources adopt CDMA to share the informations offered by relays. In general, spreading waveforms of sources are not orthogonal to each others due to pratical design issues of CDMA network. Therefore, the source signals will suffer from multiple access interference (MAI) at the relays and destination. The MAI results in the increase of bit error rate increased, and diminishes the cooperative network diveristy gains. In order to mitigate MAI, the decorrelating multiuser detection and zero-forcing precoder have been commonly adopted. But, the decorrelating multiuser detection causes noise enhancement, while the zero-forcing precoder causes power expansion. In this thesis, we adopt relay-assisted decorrelating multiuser detector (RAD-MUD) to mitigate MAI as proposed in [1].In this scheme, the relays perform half of decorrelating operation and the destination performs the other half. In this way, neither noise enhancement nor power expansion will occur. However, in the reference [1], the authers assume the transmission is synchronous between sources and relays. The assumption is unrealistic, because it is difficult to achieve synchronization between all sources and relays due to various propagation delays. In this thesis, we extend the research in [1] and relax restriction of synchronization between all sources and relays. Besides, we also adopt cooperative strategies such as transmit beamforming or selective relaying to enhance system performance. Compared with other¡¦s multiuser detection schemes, we show that the proposed schemes can effectively reduce the bit error rate.

In this thesis, the multi-carrier (MC) code division multiple access (CDMA) system in Rayleigh fading channel is considered. The system performance will be degraded due to multiple access interference (MAI) or background noise. It is know that linearly constrained inverse QR-decomposition (LC-IQRD) recursive least-square algorithm can overcome the problems. The main concern of this thesis is to implement the circuit of LC-IQRD algorithm. FPGA components and sets up a high efficient programmable hardware module. In this thesis, we implemented the circuit of LC-IQRD algorithm via a chip of Field Programmable Gate Array (FPGA) with Verilog HDL. The conventional IQRD circuit design employs systolic array architecture. The advantages of systolic array architecture include modularity and hardware simplicity. These properties are extremely desirable for VLSI implementation. In fact, we expect to reduce the execution time of the conventional IQRD algorithm circuit design. Therefore, in this thesis a modified IQRD circuit design is proposed to improve the effect of circuit implementation. It also has advantage of modularity and reduces the execution time. In order to degrade complexity of LC-IQRD algorithm circuit design, the area and speed of circuit are the consideration in this thesis. The data source is produced by Matlab software. We verify the performance of the system in terms of BER (bit error rate) and SINR (signal to interference and noise ratio).Finally, LC-IQRD algorithm circuit is realized in the Altera EP20k1500EFC-33 chip and on the Quartus II of Altera. The algorithm circuit uses 51536 logic elements (LE) for 30 bits fixed point design.

No description available.

Abstract In the wake of diversification and rapid changes in market needs, corporations have to deal with ever increasingly strict demands imposed by both customers and competitors that concern prompt supply, complicatedness in manufacturing technology, life cycle of product, and competition from within the industry. To be able to respond without any delay, consolidate their organization, and take control of operation so as to gain the ultimate advantage in competition, local small businesses must have access to a complete set of managerial accounting information that can constantly reflect the operation of each process and the correctness of information, provide strategic basis for decision making, and provide a mechanism for forecasts and advance warnings. However, selecting a set of electronic tool software that is suitable to a business is more important than anything else in gaining advantage in competition. For the present, Enterprise Resource Planning (ERP) is considered the most viable software that can integrate the internal processes of a business to effect business reengineering and connect with suppliers and consumers to achieve electronic information flow for the system. ERP is an integrative system that has been widely implemented in recent years. It has an outstanding purpose: to help plan and manage enterprise resources in an all-inclusive and integrative manner so that the business can achieve high operating efficiency and immediate improvement, reconstruct its strategic advantages, and reorganize and restart itself. It deserves our investigation whether managerial accounting information can, through the effective application of ERP system, provide corporations with prompt evaluations and make decisions for them and bring about tangible benefits in management. Therefore, this research has defined the major purposes that follow: 1. Pertinent information obtained by local small businesses when they initiate ERP can be subsequently used as the basis for evaluations when others initiate local small businesses. 2. Local small businesses, in implementing ERP, find reasonable analysis or solutions for difficulties they encounter, which will enable other businesses in the future that initiate ERP to reduce possibility of making mistakes and costs by planning in advance and taking preventing measures. 3. Understand how ERP after being initiated by local small businesses help accounting personnel enhance their functions in making spreadsheets and carrying out accounting control, and elevate their analytical skill. 4. Understand that after being initiated into local small businesses, ERP can enable managerial accounting information to bring up effectiveness to users or managers. This research, using case corporations as the subjects of study, was designed to understand the impact of ERP after being initiated on the degree of application of managerial accounting information. As to research design, literature review provided theoretical foundation. Methodology of taking grounded theory, part of qualitative research, was taken to understand the actual meaning of background environment of these corporations. Based on the nature of facts, data were collected, summarized and analyzed through questionnaire survey an case depth interview, to find out how a case corporation is related with managerial accounting information before and after it initiates ERP and to discover the support and impact given by an enterprise after it obtains managerial accounting information. The aspects of such an impact can be used by this corporation to improve or adjust its operation and provide corporations that have not initiated ERP or decided to initiate ERP with self inspection and suggestions to shorten the time frame for initiating ERP, reduce wastes on resources, ensure the effectiveness of using managerial accounting information, gain access to more opportunities so as to ensure perennial existence and create competitive edge for the corporation.

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

published_or_final_version / abstract / toc / Ecology and Biodiversity / Master / Master of Philosophy

Thesis (Ed. D.)--University of Hawaii at Manoa, 1994. / Includes bibliographical references (leaves 228-238). / Microfiche. / xiv, 238 leaves, bound ill. 29 cm

Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 61-64).

Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 134-137).