In order to make a further study of the Fifth Generation technology in the wireless communication system, the researchers have been trying heart and soul for a long time. In
From the studies of the previous research work on the 5G communication, it is obvious that neither an application of a trellis coded modulation nor an application of a MIMO technique has been adopted to overcome the impediments in tropical regions. The efficacy of this research paper relates to a design of the 5G Communication model with the help of a trellis coded flexibility and a MIMO process for tropical regions. In this research work, the trellis coded modulation (TCM) has been accepted for the proposed communication link model as the flexibility of the trellis coded modulation is considered an effective process to diminish the power required without enhancing the bandwidth
Section 1 portrays the introduction portion. Section 2 illustrates the methodology portion. Section 3 exhibits the analysis of the result and discussion portion. Section 4 narrates the conclusion portion. References have been portrayed in section 5.
In an STBC MIMO system, a code name has been chosen, and a multiple input multiple output system of type 4x4 has been developed with the aforesaid code name
Suppose,
Stage I: Choosing
Stage II: Selecting
Stage III: Putting scalars back with matrixes in an Alamouti transference matrix of type 2x2 and naming again
Stage IV: To achieve a 4x4 transfer matrix in the form of a 2x2 Alamouti matrix, the scalar values of matrixes are placed in with the help of a Hadamard matrix and the equations stand as
Stage V: To achieve an QuasiOrthogonality,the signs for 2nd and 3rd columns have been altered as per equations displayed below
Finally, the transmission matrix is,
Stage VI: The coded above symbols are now transmitted amidst the multiple input multiple output medium
H=
Now the input symbols connected with the aforesaid MIMO medium are influenced through noise till the input symbols arrive at the recipients. Additive White Gaussian (AWGN) noise is marked n_{e}. The matrixes demonstrated below exhibit the series of receivers in four intervals of time
1st interval of time:
2nd interval of time:
3rd interval of time:
4th interval of time:
The expansion of matrixes depicted above signify the equations of a receiver.
The above equations of the receiver have also been displayed in term of matrixes in equation (3) –
The above matrix is written as
The above equation (4) has been expanded from equations (5)(12) in the following manner .
The decoding process is shown below. The Maximal Ratio Combining (MRC) process is used here to obtain a complete CSIR (reduction data stream). Maximal ratio combining has consolidated the chosen coefficients which correspond to identical composite medium matrix
The matrix as demonstrated in equation (13) can also be expanded in terms of equations from (14)(17) below
The equations from (5)(17) stated above describe the device
The trellis codes for bandlimited channels arise out of combining convolution coding with modulation. This state of combining is itself called trellis coded modulation (TCM). This form of signaling comprises two basic featuresthe first feature is that the number of signal points lying in the constellation utilized is greater than what is used for the modulation format of interest with the identical data rate. Here the surplus points allow the overhead of forward error control coding without giving up bandwidth. The second feature is the utilization of convolutional coding to introduce a certain authenticity between consecutive signal points. Therefore, only certain patterns or sequences of signal points are allowed
If the transferred signal series{Sa} is contaminated by the Additive White Gaussian Noise (AWGN), the decoder will start to create the wrong decisions, and it may be involved in a trellis path consisting of multiple transmissions from the real path. Such errors are called incident events. If Viterbi decoding is applied, the probability of such error is estimated at a very high signaltonoise ratio (SNR), and the probability of such error X' can be expressed mathematically as stated below
Where W
Having applied MATLAB and Xilinx system generator, the proposed communication link model has been developed. Diversity and coding gain are two input parameters that reflect the tropical channel characteristic in OSTBC and Trellis Coded Modulation. The flow chart of the proposed model has been described in 2.3.1 at the first instance. The description of the proposed communication link model has been illustrated in 2.3.2.
This flow chart displays the high level composition of the suggested model of the communication link of the 4x4 STBC MIMO System in a step by step manner.
To reduce the bit error rate, a communication link model suggested in this paper as shown in
Bit error rate values rest on the various kinds of parameters such as the number of samples per frame, the number of transferring antennas for signal transfer and the number of receiving antennas for signals received. Bit error rate values also relies on the different types of fading dispersion. BER depending on the parameters used in this research work is highlighted in figures 6 and 7 shown below
By using mathematical equations from (5) to (12) and from (14) to (17), an orthogonal space time block coding multiplein multipleout system of type 4x4 applied to the suggested link model has been developed with the application of a system generator and therefore, it is unavoidable to display the OSTBC MIMO model as shown below in
The analysis of the result of the proposed model has been classified into two categories hardware based result analysis and simulation based result analysis. The hardware based result analysis is described in 3.1 and the simulation based result analysis is illustrated in 3.2 noted below.
A suggested model of the communication link that includes an orthogonal spacetime block coding multiple input multiple output system of type 4x4 is executed in Xilinx kintex7.




Slice LUTs 
2776 
203800 
1.36 
A piece of the Registers 
518 
407600 
0.13 
Memory 
2 
445 
0.45 
DSP 
33 
840 
3.93 
IO 
2 
500 
0.40 
Clipping 
4 
32 
12.50 
The simulation results in respect of the suggested model for the communication link are analyzed in the following manner. When this suggested model undergoes simulation, the values of the BER get displayed in a block for Rayleigh dispersion and Rician dispersion. The values of the BER for two types of dispersions have been compared and
kinds of MIMO technologies viz. 2x2, 3x3 and 4x4 are used in this suggested model. BER values for different MIMO strategies are shown in the aforesaid block of the suggested model, and a comparison of values of the BER for various multiplexinput and multiplexoutput strategies exhibited in
All the previous research works included in the introduction portion have been examined but it would transpire that in some previous works trellis coded modulation has been used and in some works the 5G communication has been adopted. But it would appear that neither trellis coded modulation not 5G communication has been used for heightening the wireless communication system in tropical regions. So the work in this paper is quite different from the previous works. So there is left no scope for comparison between the previous works and the work in this. Besides, it would also appear that no hardware implementation of 4x4 OSTBC MIMO using Xilinx System generator and FPGA for tropical regions has been executed in the previous research works.
If this research work is depicted in a nut shell, it is observed from