Informatics Publishing Limited

Dhirendra Kumar Tripathi ¹

Affiliations
1 Department of Information and Technology, School of Computing, SASTRA University, Thanjavur 613403, IN

Abstract

IEEE 802.11p is an approved amendment to the IEEE 802.11 standard to add wireless access in vehicular environments (WAVE). It defines enhancements to 802.11 required to support Intelligent Transportation Systems (ITS) applications. This includes data exchange between high-speed vehicles and between the vehicles and the roadside infrastructure in the licensed ITS band of 5.9 GHz (5.85-5.925 GHz). IEEE 1609 is a higher layer standard on which IEEE 802.11p is based. The present paper gives a framework of making a simulation model for the physical layer of the IEEE802.11p transmitter. This paper presents a fixed point synthesizable model of Physical layer. The system is first evaluated in the Matlab Simulink environment to conform to IEEE standard. Using the Xilinx ISE software flow the system is synthesized in the Xilinx Virtex-4 FPGA. The performance of the system in term of throughput and hardware resources is presented.

Keywords

OFDM, Interlever, Turbo Encoder, Physical Layer Convergence Protocol (PLCP) Sublayer.

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Dhirendra Kumar Tripathi ¹, D. Muralidharan ², S. Sarvanan ³

Affiliations
1 Department of Information and Communication Technology, School of Computing, SASTRA University, Thanjavur, TN 613402, IN
2 Department of Information Technology, School of Computing, SASTRA University ,Thanjavur, TN 613402, IN
3 Department of Information Technology, School of Computing, SASTRA University, Thanjavur, TN 613402, IN

Abstract

In this paper, we present design and field programmable gate array (FPGA) implementation of fractional bit encoded (FBE)–spatial modulation (SM) based transmitter for the multiple-input multiple output (MIMO) system. SM is a novel approach to multiple–input–multiple–output (MIMO) systems which entirely avoids inter–channel interference (ICI) and requires no synchronization between the transmit antennas, while achieving a spatial multiplexing gain. This is performed by mapping a block of information bits into a constellation point in the signal and spatial domains. Fractional bit encoding is modulus conversion scheme which convert the incoming bit stream to numbers in an arithmetic base, or modulus, that is not a power of 2 .When applied to SM, FBE relies on encoding each point in the spatial domain, i.e., the antenna index, with, on average, a non–integer number of bits, while keeping unchanged the encoding process in the signal domain. This results in a more versatile system design allowing transmitter to be equipped with an arbitrary number of antennas for a wider range of spectral efficiencies given restrictions on space and power consumption. It is especially useful for compact mobile devices where cost and space constraints pose fundamental limits on the achievable bit rate. The synthesis results of the implementation of transmitter on FPGA are included in the paper.

Keywords

Fractional Bit Encoding (FBE), Inter Channel Interference (ICI), Multiple Input multiple Output(MIMO) System, Spatial Modulation (SM).

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