Copyright © 2018Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering &Technology, 8 (4) (2019) 398-401 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Performance analysis of highly improved hybrid turbo codes for 4G wireless networks M. Jose Raj 1 *, Dr.Sharmini Enoch 2 1 Research Scholar Dept of ECE, Noorul Islam Center for Higher Education Kanyakumari District, Tamilnadu, India 2 Professor Dept of ECE, Noorul Islam Center for Higher Education Kanyakumari District, Tamilnadu, India *Corresponding author E-mail: Abstract Efficient error correcting codes are essential in modern digital communication systems. Highly Improved Hybrid Turbo Code (HIHTC) is a low complex error and efficient error correcting code with excellentBit Error Rate (BER) which is comparable to Low Complexity Hybrid Turbo Codes (LCHTC), Improved Low Complexity Hybrid Turbo Codes (ILCHTC) and other Hybrid Turbo Codes. Rate 1/3 HIHTC shows a BER of 10-5 for E b/No of 1.7 dB which is closer to the E b/No of Improved Low Complexity Hybrid Turbo Codes. In this paper we analyze the performance of HIHTC in comparison with otherLow Complexity Hybrid Turbo Codes, for their performance in 4G and 5G wireless networks Keywords:Zigzag-Hadamard (ZH); A Posteriori Probability (APP); Bit Error Rate (BER); Decoder Complexity(DC); Hybrid Turbo Code (HTC). 1. Introduction Shannon’s limit gives the relationship between Signal to Noise Ratio and Channel Capacity of a communication channel. A relia- ble and efficient error correcting code is essential for error free communication and it should obey the Shannon’s limit rule. Since reflection of signals in multiple channels and fading of signals lead to errors the error correcting code should be efficient with low BER. Turbo convolution codes (TCC) [2] is the efficient error correcting code with better BER. But the decoder complexity of TCC is more. The hardware requirement is more and need more complex Trellis decoding process to decode one bit. MAP based algorithmafter puncturing is used to improve the code rate .But the performance is not much improved. HIHTC [1] is the improved version of ILCHTC which is the combination of TCC and ZH codes and hence called Hybrid Low Complexity Hybrid Turbo Code.. In HIHTC Complexity is very much reduced and BER is improved and approaches Shannon’s limit. We analyze the per- formance of Hybrid Low Complexity Hybrid Turbo Code for high speed data rates in 4G and 5G wireless networks. 2. Encoder description HIHTC encoder using Zigzag [5] Hadamard code and Recursive Systematic Convolution (RSC) code as shown in Fig.(1) Fig. 1:HIHTC Encoder. The HIHTC overall encoder has two constituent encoders. The first encoder is the RSC encoder and the second one is the zig- zaghadamard encoder. Initially the data is directly given to the encoder, then the data is interleaved using a random interleaver and then encoded by the convolution encoder and the interleaved data is given to the zig-zaghadamard encoder. Finally the overall data is given to the decoders. In HIHTC the information bits are arranged in a rectangular array of size PxQ (p + (j – 1) X q) th information bit is denoted by d( j, k) d = {d(j, k)}, 1 ≤ j ≤ P and 1 ≤ k ≤ Q ZH m (k) = ∑ d(h, k) + ZH m (k − 1) J j=1 mod P- row length of array matrix Q- Column length of array matrix d- encoded data bit