# Transmitter Diversity Gain Technique Aided Irregular Channel Coding for Mobile Video Transmission
## 2 Literature Review  
There are two main problems in obtaining higher data-rates in a reliable communication, i.e., bandwidth limitation and channel fading. [PERSON]'s information-theoretic work [PERSON] (1948) presented the basics of channel capacity bounds over a noisy communication channel and identified the most possible error-resilient features of communication systems. Channel codes are incorporated in the systems to effectively deal with the noisy channels. With bandwidth as a very precious commodity, maintaining a higher compression efficiency and data integrity is extremely important. Considerable factors affecting signal in wireless transmission are attenuation, shadowing, fading, and multi-user interference, which results in time and location-varying channel conditions. The first forward error correction block code for a single error correction was the Hamming code that was proposed in [PERSON] was the first who discovered error-correcting convolutional codes in [PERSON] (1999), in which the encoding dependencies shifted from finite-length segments to encoding dependencies that exist over the entire block. Turbo codes are first presented in [PERSON] (1999), which comprises the concatenation of two Recursive Systematic Convolutional (RSC) codes attached together with an interleaver. In [PERSON] (1999), Irregular-Variable length coding (IVLC) is presented, which endows its performance to near capacity on joint source channel coding. The source coding part in Iterative Source Channel Decoding (ISCD) extracts the spectral coefficients from the multimedia source contents--i.e., audio or video signal. Residual redundancy remains in the coded coefficients after passing from the source codec in the form of non-uniform distribution and it can be manipulated at the receiver side to overcome the transmission errors. ISCD schemes operate on residual redundancy as a prime source for error protection in the coded video bitstream [17; 18]. Moreover, for exploiting the performance of ISCD on residual redundancy in the source coded video bit-stream, a delightful Soft Bit Source Decoding (SBSD) scheme is proposed in [17]. Although, in the source coded bit-stream, very limited redundancy remains after the employment of the advanced compression techniques from the state-of-the-art compression standards. In [19], ISCD is proposed, which manipulates residual and artificial redundancy for minimizing the error robustness in digital systems, being motivated by concatenated codes. The authors proposed a convolutional neural network that was inspired by the advances in deep learning using iterative belief propagation architecture channel decoding under correlated noise [20]. Furthermore, a soft input decoder that is based on exploiting the residual redundancy in compressed bits and on the _A-Posteriori_ probability of each symbol is presented. Moreover, the error-correcting or concealment capabilities of ISCD is evaluated by the EXtrinsic Information Transfer (EXIT) Chart. In [21], the authors show the EXIT chart as a versatile tool for the design of different serial concatenation codes and a system design criteria on the EXIT chart has been briefly presented in [22]. The extent of performance achievement in terms of the convergence behavior of the iterative coding process in the form of the number of profitable iterations is determined by EXIT chart analysis in [23]. IrRegular Convolutions Codes (IRCCs) is proposed in [24], where the iterative decoding performance of the serially concatenated system is improved with the aid of EXIT chart using different constituent convolution codes having different code-rates. With the potential to exploit the merits of source and channel decoding for mutual advantage, Joint Source Channel Decoding (JSCD) has received significant research interest in providing the lowest possible BER on realistic channel [19; 25; 26; 27]. In [28], an analog low complexity Joint Source Channel Coding (JSCC) system is proposed for the transmission of still images.