scholarly journals Enhanced Huffman Coded OFDM with \\Index Modulation

2020 ◽  
Author(s):  
Shuping Dang ◽  
Shuaishuai Guo ◽  
Justin P. Coon ◽  
Basem Shihada ◽  
Mohamed-Slim Alouini
Keyword(s):  
Power Allocation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Transmission Rate ◽  
Numerical Results ◽  
Error Performance ◽  
Activation Patterns ◽  
Average Block ◽  
Evaluation Metric ◽  
Coded Ofdm ◽  
Index Modulation

<pre>In this paper, we propose an enhanced Huffman coded orthogonal frequency-division multiplexing with index modulation (EHC-OFDM-IM) scheme. The proposed scheme is capable of utilizing all legitimate subcarrier activation patterns (SAPs) and adapting the bijective mapping relation between SAPs and leaves on a given Huffman tree according to channel state information (CSI). As a result, a dynamic codebook update mechanism is obtained, which can provide more reliable transmissions. We take the average block error rate (BLER) as the performance evaluation metric and approximate it in closed form when the transmit power allocated to each subcarrier is independent of channel states. Also, we propose two CSI-based power allocation schemes with different requirements for computational complexity to further improve the error performance. Subsequently, we carry out numerical simulations to corroborate the error performance analysis and the proposed dynamic power allocation schemes. By studying the numerical results, we find that the depth of the Huffman tree has a significant impact on the error performance when the SAP-to-leaf mapping relation is optimized based on CSI. Meanwhile, through numerical results, we also discuss the trade-off between error performance and data transmission rate and investigate the impacts of imperfect CSI on the error performance of EHC-OFDM-IM. </pre>

scholarly journals Enhanced Huffman Coded OFDM with \\Index Modulation

2020 ◽  
Author(s):  
Shuping Dang ◽  
Shuaishuai Guo ◽  
Justin P. Coon ◽  
Basem Shihada ◽  
Mohamed-Slim Alouini
Keyword(s):  
Power Allocation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Transmission Rate ◽  
Numerical Results ◽  
Error Performance ◽  
Activation Patterns ◽  
Average Block ◽  
Evaluation Metric ◽  
Coded Ofdm ◽  
Index Modulation

<pre>In this paper, we propose an enhanced Huffman coded orthogonal frequency-division multiplexing with index modulation (EHC-OFDM-IM) scheme. The proposed scheme is capable of utilizing all legitimate subcarrier activation patterns (SAPs) and adapting the bijective mapping relation between SAPs and leaves on a given Huffman tree according to channel state information (CSI). As a result, a dynamic codebook update mechanism is obtained, which can provide more reliable transmissions. We take the average block error rate (BLER) as the performance evaluation metric and approximate it in closed form when the transmit power allocated to each subcarrier is independent of channel states. Also, we propose two CSI-based power allocation schemes with different requirements for computational complexity to further improve the error performance. Subsequently, we carry out numerical simulations to corroborate the error performance analysis and the proposed dynamic power allocation schemes. By studying the numerical results, we find that the depth of the Huffman tree has a significant impact on the error performance when the SAP-to-leaf mapping relation is optimized based on CSI. Meanwhile, through numerical results, we also discuss the trade-off between error performance and data transmission rate and investigate the impacts of imperfect CSI on the error performance of EHC-OFDM-IM. </pre>

scholarly journals Space Time Trellis Code Frequency Index Modulation with Neuro-LS Channel Estimation in OFDM

2019 ◽  
Vol 5 (9) ◽  
pp. 7
Author(s):  
Sarita Yadav ◽  
Ashish Nema ◽  
Jitendra Mishra
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Transmission Rate ◽  
Space Time ◽  
Time Shift ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Error Performance ◽  
Result Analysis ◽  
Index Modulation

In wireless communication, orthogonal frequency division multiplexing (OFDM) plays a major role because of its high transmission rate. In space-time shift keying (STSK), the information is conveyed by both the spatial and time dimensions, which can be used to strike a trade-off between the diversity and multiplexing gains. On the other hand, orthogonal frequency division multiplexing (OFDM) relying on index modulation (IM) conveys information not only by the conventional signal constellations as in classical OFDM, but also by the indices of the subcarriers. In this paper compressed sensing(CS) is studied in order to increase throughput and bit-error performance by transmitting extra information bits in each subcarrier block as well as to decrease the complexity of the detector. In this paper, soft trellis decoding algorithm is implemented with channel estimation using Neuro-LS technique. The result analysis shows the better performance of trellis decoder with respect to BER and Neuro-LS channel estimation with respect to BER.

scholarly journals Performance Analysis of Repeated Index Modulation with Coordinate Interleaving over Nakagami-m Fading Channel

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Lê Thị Thanh Huyền ◽  
Trần Xuân Nam
Keyword(s):  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Error Probability ◽  
Spatial Modulation ◽  
Error Performance ◽  
New Space ◽  
Golden Code ◽  
Coordinate Interleaving ◽  
Repeated Index ◽  
Index Modulation

In this paper, a new Space-Time Block Coded Spatial Modulation (SM) scheme based on the Golden Code, called the In this paper, we evaluate the symbol error performance of an extended Index Modulation for Orthogonal Frequency Division Multiplexing (IM-OFDM), namely repeated index modulation-OFDM with coordinated interleaving (abbreviated as ReCI), over the Nakagami-m fading channel. The ReCI system attains higher error performance than the conventional IM-OFDM with coordinate interleaving (IMOFDM-CI). In order to investigate the system performance over the Nakagami-m fading channel, we derive the closed-form expressions for the symbol error probability (SEP) and the bit error probability (BEP). The analytical results give interesting insights into the dependence of SEP on system parameters. Their tightness is also validated by numerical results, which show that our proposed scheme can provide considerably better error performance than the conventional IM-OFDM and IM-OFDM-CI at the same spectral efficiency.

scholarly journals Equalization for Underwater Acoustic Coded OFDM Communication System Over Multipath Fading Via Simulation Platform

2019 ◽  
Vol 9 (2S3) ◽  
pp. 292-294
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Rayleigh Fading ◽  
Multipath Fading ◽  
Least Square ◽  
Adaptive Equalization ◽  
Frequency Division ◽  
Recursive Least Square ◽  
Error Performance ◽  
Multiple Paths ◽  
Coded Ofdm

In underwater shallow acoustic communication (UWSAC) channel, due to the reflections from bottom and surface, multiple paths propagated resulting Inter Symbol Interference (ISI). In this paper we present the bit error performance of convolution coded orthogonal frequency division multiplexing (CCOFDM) UWSAC system with the implementation of adaptive equalization to minimize the ISI over AWGN and Rayleigh fading based on Recursive least square (RLS) and Filtered Error Least Mean Squares (FELMS) Algorithms. From the simulation results it is observed that FELMS shown to improve BER as compared to an RLS with CCOFDM system..

Performance Analysis of Repeated Index Modulation with Coordinate Interleaving over Nakagami-m Fading Channel

2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Le Thi Thanh Huyen ◽  
Tran Xuan Nam
Keyword(s):  
Fading Channel ◽  
Orthogonal Frequency Division Multiplexing ◽  
Error Probability ◽  
Spatial Modulation ◽  
Error Performance ◽  
New Space ◽  
Golden Code ◽  
Coordinate Interleaving ◽  
Repeated Index ◽  
Index Modulation

In this paper, a new Space-Time Block Coded Spatial Modulation (SM) scheme based on the Golden Code, called the In this paper, we evaluate the symbol error performance of an extended Index Modulation for Orthogonal Frequency Division Multiplexing (IM-OFDM), namely repeated index modulation-OFDM with coordinated interleaving (abbreviated as ReCI), over the Nakagami-m fading channel. The ReCI system attains higher error performance than the conventional IM-OFDM with coordinate interleaving (IMOFDM-CI). In order to investigate the system performance over the Nakagami-m fading channel, we derive the closed-form expressions for the symbol error probability (SEP) and the bit error probability (BEP). The analytical results give interesting insights into the dependence of SEP on system parameters. Their tightness is also validated by numerical results, which show that our proposed scheme can provide considerably better error performance than the conventional IM-OFDM and IM-OFDM-CI at the same spectral efficiency. DOI: 10.32913/mic-ict-research.v2019.n1.863

Bit and Power Allocation Algorithm for OFDM UWB Systems

2013 ◽  
Vol 760-762 ◽  
pp. 472-477
Author(s):  
Hai Yan Li
Keyword(s):  
Wireless Communication ◽  
Power Allocation ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Transmission Rate ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Allocation Algorithm ◽  
Communication Capacity ◽  
Allocation Factor

Ultra-wide-band (UWB) is a promising short-range indoor wireless communication technology for large communication capacity, high transmission rate, low power consumption, etc. Multi-band orthogonal frequency-division multiplexing ultra-wide-band (MB-OFDM UWB) system can achieve much higher anti-noise capability and flexibility. However, the transmission power of UWB systems is strictly restricted for avoiding the interference with other wireless communication systems existing in the same frequency spectrum range. It is necessary that adequately utilizes channel estimation to allocate bit and power effectively. According to the change of channel gain, UWB systems modify the allocation factor to optimize the performance of systems and reduce power allocation remainder. Simulation shows modified bit-power allocation algorithm can enhance power allocation efficiency. Furthermore, it is found that the power remainder of modified allocation factor algorithm is less influenced by the bit error rate.

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