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Improving the Spectral Efficiency and Data Rate of FHCDMA Scheme for Wireless Communication Channels.

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Author(s): P V V Santosh Babu | O Sudhakar | DR.V Sailaja

Journal: International Journal of Engineering Sciences & Research Technology
ISSN 2277-9655

Volume: 2;
Issue: 10;
Start page: 2694;
Date: 2013;
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Keywords: Code division multiple access | code modulation | frequency hopping | spectral efficiency

ABSTRACT
In this project, we propose a “two-level” frequency hopping code-division multiple-access (FH-CDMA) scheme for wireless communication systems. In our two-level FH-CDMA scheme, the available transmission bandwidth is divided into ℎ frequency bands with . carrier frequencies in each band. In the first (modulation) level, a number of serial data bits is grouped together and represented by a symbol. Each symbol is, in turn, represented by a modulation code of dimension × . In the second (FH) level, each user is assigned a unique FH pattern of dimension ℎ × ℎ and weight (i.e., number of elements) ℎ, where ℎ is the number of frequencies, ℎ is the number of time slots (i.e., pattern length). The elements in the modulation codes and FH patterns determine the carrier frequencies of the final FH-CDMA signals. . The new scheme provides flexibility in the selection of modulation codes and FH patterns. Our results show that the partitioned two-level FH-CDMA scheme supports higher data rate and greater SE than Goodman’s frequency-shift-keying FHCDMA scheme
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