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GENERALIZATION OF ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WITH INDEX
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GENERALIZATION OF ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING WITH INDEX

Category : Communication


Sub Category : OFDM


Project Code : ITCM06


Project Abstract

Recently, orthogonal frequency division multiplexing (OFDM) with index modulation (OFDM-IM) was proposed By selecting a fixed number of subcarriers as active subcarriers to carry constellation symbols, the indices of these active subcarriers may carry additional bits of information. In this paper, we propose two generalization schemes of OFDM-IM, named as OFDM with generalized index modulation 1 (OFDMGIM1) and OFDM-GIM2, respectively. In OFDM-GIM1, the number of active subcarriers in an OFDM sub block is no longer fixed. Dependent on the input binary string, different number of active subcarriers are assigned to carry constellation symbols. In OFDM-GIM2, independent index modulation is performed on  the in-phase and quadrature component per subcarrier. Through such ways, a higher spectral efficiency than that of OFDM-IM may be achieved. Since both generalization schemes proposed suffer from BER performance loss in low SNR region, an interleaving technique is proposed to tackle this problem. Finally  noting that the two generalization schemes are compatible with each other, the combination of these two schemes, named as OFDM-GIM3, has also been investigated. Computer simulation results clearly show our proposed scheme’s superiority in both spectral efficiency and BER performance compared to existing works.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

OFDM with index modulation (OFDM-IM) is existing system.

 

 

 

 

PROPOSED CONCEPT

we propose two generalization schemes of OFDM-IM, named as OFDM with generalized index modulation 1 (OFDMGIM1) and OFDM-GIM2, respectively.

       Finally, the two generalization schemes are compatible with each other, the combination of these two schemes, named as OFDM-GIM3, has also been investigated.

 

EXISTING TECHNIQUE:

OFDM-IM

PROPOSED TECHNIQUE:

OFDM -GIM1

OFDM-GIM2

OFDM-GIM3

TECHNIQUE DEFINITION:

Orthogonal Frequency Division Multiplexing with Index Modulation

 

TECHNIQUE DEFINITION:

Orthogonal Frequency Division Multiplexing With  With Generalized Index Modulation 1, 2 and 3

 

DRAWBACKS

OFDM - IM’s difficulty in adopting QPSK symbols

ADVANTAGES

Improve the spectral efficiency

      Reduced  Bit error rate

 

 

 
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