Efficient Detection Algorithm for a Multiple-Input and Multiple-Output MultiuserMulti-Carrier Code Division Multiple Access in Time-Varying Channels

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Efficient Detection Algorithm for a Multiple-Input and Multiple-Output Multiuser Multi-Carrier Code Division Multiple Access in Time-Varying Channels

Problem statement: Maximum Likelihood (ML) decoding has been applied for the uplink of a Multi-Carrier Code Division Multiple Access (MC-CDMA) system based on Orthogonal Frequency Division Multiplexing (OFDM). Multiple-Input Multiple-Output (MIMO) channel from k users, which moves at vehicular speed, to the Base-Station (BS) is time-varying. For time-varying channels, Sphere Decoding (SD) was i...

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Differential Space Time Modulation and Demodulation for Time Varying Multiple Input Multiple Output Channels

ii I would like to dedicate this work to my parents Sathyavathi Gundappa and Jaishankar Chitnis who have supported me throughout my academic endeavors, without them this may never have been possible.

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Group detection for synchronous Gaussian code-division multiple-access channels

The concept of group detection is introduced to address the design of suboptimum multiuser detectors for CodeDivision Multiple-Access (CDMA) channels. A group detection scheme consists of a bank of P group detectors, one each for detecting the information symbols of users in each group of a P group partition of the li simultaneously transmitting users. In a parallel group detection scheme, thes...

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Code Division Multiple Access

1 CDMA Concept 4 1.1 Basic Principles of Spread Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1 Direct Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1.2 Frequency Hopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.3 Time Hopper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1.4 Hybrid Systems . ....

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Spread-time code-division multiple access

An alternative code-division multiple-access (CDMA) scheme to spread spectrum (SS), called spread time (ST) is proposed for badlimited multiple-access channels. ST-CDMA can be considered the be-frequency dual of SS-CDMA. In ST-GDMA pslendsraodan (PN) sequences are assigned to each user, and the Fourier tcrursf@rm of the transmitted pulse for a given user is d&mined by modulating the phase of th...

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ژورنال

عنوان ژورنال: American Journal of Engineering and Applied Sciences

سال: 2009

ISSN: 1941-7020

DOI: 10.3844/ajeassp.2009.635.642