Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 58 for “"Code-Division Multiple Access (CDMA)"”.
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High performance multi-carrier technologies with expanded applicability to CDMA systems (DS-CDMA and MC-CDMA)
Code division multiple access (CDMA) has been an important component in wireless communication systems since the early 1980’s. Now the frontrunner in the 3G cellular standard, CDMA techniques have come a long way since their inception. However, these systems are not without their limitations -- …
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Practical multiuser detection algorithms for CDMA
… mobile communications systems that are based on code division multiple access (CDMA) technologies. These include the adaptive receiver and the interference canceller. The overall complexity of implementing them is examined. The effects of the proposed algorithms on reducing of multiple access …
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A Code Division Multiple Access Communication System for the Low Frequency Band
In this thesis, a code division multiple access (CDMA) communication system for the low frequency (LF) channel is proposed, discussed and analyzed. This LF/CDMA scheme is similar to classical CDMA schemes in that K users share a channel by phase modulating their transmissions with signature …
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Performance of a wideband CDMA system under multipath fading
… an asynchronous, noncoherent, direct-sequence, code-division multiple-access (CDMA) system using wideband M-ary FSK as bandpass modulation. The immediate analysis and determination of the average probability of bit error is made inherently more difficult because of two random effects. The first …
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Frequency hopping using CDMA to avoid malicious attack in han networks
Frequency hopping and Code-Division Multiple Access (CDMA) is often deployed to protect wireless communication from malicious attacks. The data is enabled to be received by the recipients. The data is delayed or blocked when it try to enter the network. This project is developed by hybrid the …
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An analysis of a broadband multicarrier CDMA cellular communications system
… of video and data information, i.e. Internet access, video teleconferencing and data transfer, required to support the war fighter within a Joint Task Force demands technologies that reduce the interference imposed by poor terrestrial and atmospheric conditions. In order to minimize the effect …
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Demonstration and evaluation of co-channel DBPSK source separation
… of complex multi-input-multi-output (MIMO) and code division multiple access (CDMA) systems, single antenna source separation presents a simple alternative that is suitable in settings such as RFID where sources are naturally synchronized. Motivated by the analysis of physical channel properties …
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Macromodeling and demonstration of the LT6600 amplifier and lowpass filter
… the LT6600-2.5 was integrated into a digital code-division multiple access (CDMA) communications system, complete with transmit and receive sections. The performance of the LT6600 in this system was shown to be as good as or better than most conventional filtering approaches. When implemented …
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Advanced data bus architecture using CDMA for highly reliable systems
… thesis is to prove the feasibility of the use of code division multiple access (CDMA) to permit shared data bus architecture for fault-tolerant applications. Four families of pseudorandom codes, the Barker, gold, maximal length, and GPS C/A codes, were evaluated for their performances with respect …
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A multistage RAKE receiver for CDMA systems
… RAKE receiver for use at the base station of a Code Division Multiple Access (CDMA) cellular communications system. This receiver combines the interference rejection capability of multiuser receivers with the robust performance of a RAKE receiver in the presence of multipath interference. Unlike …
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Orthogonally coded MIMO array for Ka-band (26.5 - 40 GHz) millimeter-wave imaging
… frequency (IF) signals with orthogonal codes, commonly called code division multiple access (CDMA). This method allows the array to distinguish the radar back-scatter for each transmitter of the imaging system when they are operated simultaneously. This simultaneous operation of the …
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Simulation and Mathematical Tools for Performance Analysis of Low-Complexity Receivers
… for the Satellite Digital Audio Radio (SDAR), Code Division Multiple Access (CDMA) and UltraWideband (UWB) communications technologies. A graphical-user-interface simulation tool has been developed to predict the link reliability performance of the SDAR services in the continental United …
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A comparison of two novel channel coding techniques for CDMA
In Code Division Multiple Access (CDMA) systems forward error correction (FEC) is an important factor in improving system performance. Because of the multiple access interference observed in asynchronous CDMA, FEC is required to improve system capacity. Several alternative coding techniques are …
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CAPACITY ENHANCEMENT OF CDMA SYSTEM USING ANTENNA ARRAY
… study of capacity enhancement for a multirate code-division multiple access (CDMA) system with uniform linear array (ULA) at the base station (BS) [1 - 3]. An overall system outage probability is proposed as a capacity performance measure for multirate CDMA system with different service …
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A new hybrid acquisition scheme for CDMA systems employing short concatenated codes
… our times and the important role being played by Code Division Multiple Access (CDMA) in the realization of the goals of second generation wireless systems, there is an ever increasing need for the development of better acquisitions techniques along with the study of a variety of techniques. …
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Design and Implementation of an FPGA-based Adaptive filter Single-User Receiver
… the quality of services and system capacity. The Code Division Multiple Access (CDMA) cellular system had been proposed for use as a new standard for cellular telephone systems. A great deal of research has been conducted to develop receiver structures useful for CDMA systems. Traditional …
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Dynamic Code Sharing Algorithms for IP Quality of Service in Wideband CDMA 3G Wireless Networks
… efficient utilization of wireless bandwidth in Code Division Multiple Access (CDMA)systems that support multiple data rates with Orthogonal Variable Spreading Factor (OVSF)codes. The specific problem being addressed was that currently proposed public-domain algorithms for assigning OVSF codes …
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Receiver Implementations for a CDMA Cellular System
… popularity in North America is a 1.25 MHz Code Division Multiple Access (CDMA) system (IS-95). In CDMA systems, multiple access interference limits the capacity of any system using conventional single user correlation or matched filter receivers. Previous research has shown that multiuser …
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Analytical models of IP traffic on UMTS mobile networks
… of a land-based Core Network and a UMTS Radio Access Network (UTRAN). UMTS networks utilise Code Division Multiple Access (CDMA) technologies to multiplex the radio resources available to the network. CDMA allows for all users of the network to transmit simultaneously, reducing the need to …
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