Analysis of LDPC Code in Hybrid Communication Systems

Abstract

Free-space optical (FSO) communication is of supreme importance for designing next-generation networks. Over the past decades, the radio frequency (RF) spectrum has been the main topic of interest for wireless technology. The RF spectrum is becoming denser and more employed, making its availability tough for additional channels. Optical communication, exploited for messages or indications in historical times, is now becoming famous and useful in combination with error-correcting codes (ECC) to mitigate the effects of fading caused by atmospheric turbulence. A free-space communication system (FSCS) in which the hybrid technology is based on FSO and RF. FSCS is a capable solution to overcome the downsides of current schemes and enhance the overall link reliability and availability. The proposed FSCS with regular low-density parity-check (LDPC) for coding techniques is deliberated and evaluated in terms of signal-to-noise ratio (SNR) in this paper. The extrinsic information transfer (EXIT) methodology is an incredible technique employed to investigate the sum-product decoding algorithm of LDPC codes and optimize the EXIT chart by applying curve fitting. In this research work, we also analyze the behavior of the EXIT chart of regular/irregular LDPC for the FSCS. We also investigate the error performance of LDPC code for the proposed FSCS.

Mixed Coded RF/FSO EH-Based Communication System Subject to Multiuser Interference and Residual Hardware Impairments

“…For instance, using the Monte-Carlo simulation method, the authors in [26] and [27] studied the performance of low-density parity check (LDPC) codes over a hybrid FSO/RF parallel WCS and the evaluation of the polar codes across a few 5G scenarios, respectively. Additionally, hybrid FSO/RF communication systems can be improved using the EXIT Chart method, switching techniques and routing protocols as mentioned in [28], [29]. Also, as studied in [30], the hybrid FSO/RF system outperforms the individual FSO and RF systems and gives a power gain of 3dB over a distinct number of receive antennas.…”

“…Remark 3. It is worth noting from (28), that when γ (ℓ) RD tends to infinity, the e2e SNR γ eq ≈ γ S1R . As a result, at a fixed value of γ S1R , the system's ABEP performance stabilizes.…”