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OVSF Code Assignment for Wideband Code Division Multiple Access (WCDMA) in FPGA

P. Kavipriya*, C. Gomathi**

* Research Scholar, Sathyabama University, Chennai, India.

** Professor & Head, SRM University, Chennai, India.

Periodicity:October - December'2012
DOI : https://doi.org/10.26634/jwcn.1.3.2049

Abstract

This paper describes the wideband Direct Sequence Code Division Multiple Access (WCDMA) wireless transmitter design using Field Programmable Gate Array (FPGA), which has been adopted in many wireless access technologies. Four separate blocks have been designed using digital approach to form the transmitter circuit diagram using the oscillator, the OVSF-code generator, the Parity Check, and the BPSK modulator. The WCDMA air interface was initially designed to support a wide variety of services with different QoS requirements having a maximum bit rate of 2 Mb/s. In order to satisfy the future service and application needs several technical enhancements are being studied and standardized for WCDMA in 3GPP. Wideband code division multiple access (WCDMA) uses orthogonal variable spreading factor (OVSF) codes to support diversified data transmission rates and quality of service (QoS). In this paper, we propose a improved OVSF code assignment to support QoS for WCDMA.The Synopsys software has been used for the design synthesis and simulation; the Very High Speed Integrated Circuit Hardware Description Language (VHDL) program was used for coding and FPGA for compiling and downloading the simulation. The WCDMA wireless transmitter was designed to transmit with data rates up to 2 Mbps. The transmitted signals were carried with a 40 MHz carrier frequency.

Keywords

WCDMA, OVSF Code, FPGA.

How to Cite this Article?

Kavipriya, P., and Gomathy, C. (2012). OVSF Code Assignment For Wideband Code Division Multiple Access (WCDMA) in FPGA, i-manager’s Journal on Wireless Communication Networks. 1(3), 8-13. https://doi.org/10.26634/jwcn.1.3.2049

References

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