Rate-adaptive FSO communication via rate-compatible punctured LDPC codes

Liu, Linyan; Safari, Majid; Hranilovic, Steve

doi:10.1109/icc.2013.6655175

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Compared to our pervious work of punctured LDPC coded FSO system [4], the proposed Raptor coded system has several advantages. The Raptor code theoretically leaves no bit error in the decoded massages and the performance of the rateadaptive system is limited by the performance of CRC in practice.…”

Section: Performance Comparison With Uncoded Fso Systemmentioning

confidence: 97%

“…Since the variation of channel gain is slow compared to the packet size of P = 2 r , 8  r  13 at signaling rates of 1Gbps or 5Gbps [4], it is reasonable to assume that h is fixed over a packet duration. Therefore, (4) is reduced to E = 1 (1 ⇠) P , where ⇠ is bit erasure rate within the packet duration.…”

Section: B Decoding Of Systematic Raptor Codesmentioning

confidence: 99%

“…Hybrid RF/FSO channel coding is proposed in [3] to provide reliable communication. Application of punctured low density parity check (LDPC) codes in FSO communication is studied in [4] using channel measurements. The rate-adaptive performance of punctured LDPC and rateless codes are compared in [5] using the recorded data of an FSO channel at wavelength 650 nm.…”

Section: Introductionmentioning

confidence: 99%

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Systematic raptor codes for atmospheric optical channels

Liu

Safari

Hranilovic

2013

2013 13th Canadian Workshop on Information Theory

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In this paper, a rate-adaptive free-space optical (FSO) communication system using systematic Raptor codes is investigated based on experimental data measured over a 1.87 km terrestrial FSO link in different weather conditions. Using Raptor codes, the FSO communication system can adapt to the channel gain fluctuations caused by atmospheric turbulence and/or adverse weather conditions. To alleviate the burden of synchronizing between transmitter and receiver, messages are packetized and sent in sequence. For each packet, a cyclicredundancy code (CRC) is added resulting in an effective packet erasure channel (PEC). Using experimental data and on-offkeying (OOK) modulation, the performance of the rate-adaptive FSO system is evaluated at different signaling rates. While an uncoded FSO system fails to efficiently operate during adverse weather conditions, the rate-adaptive technique provides reliable FSO communication under clear and rainy weather conditions.

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Section: Performance Comparison With Uncoded Fso Systemmentioning

confidence: 97%

Section: B Decoding Of Systematic Raptor Codesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Systematic raptor codes for atmospheric optical channels

Liu

Safari

Hranilovic

2013

2013 13th Canadian Workshop on Information Theory

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“…A practical scheme of adaptive transmission has been considered to mitigate turbulenceinduced fading in FSO links to adjust parameters such as the transmit power, code rates and modulation schemes using the CSI received via the feedback path [11]. Variable and adaptive transmission schemes have been reported in literature [15][16][17][18][19]. In [10], a power allocation scheme in a wavelength division multiplexing (WDM) FSO link was proposed to mitigate atmospheric attenuation.…”

Section: Introductionmentioning

confidence: 99%

“…In [16], an adaptive modulation and coding scheme for FSO was proposed where the CSI was estimated at the receiver (Rx) and it relays back to the transmitter (Tx) via an RF feedback path. In [17], a rate adaptive on‐off keying FSO link was practically demonstrated using an optimised punctured low‐density parity check (LDPC) codes. In [18], a delay and quality‐of‐service aware adaptive modulation scheme was proposed for a coherent dual‐channel optical wireless communication system under Gamma‐Gamma (GG) turbulence.…”

Section: Introductionmentioning

confidence: 99%

The BER performance of a FSO system with polar codes under weak turbulence

Mohan

Ghassemlooy

et al. 2021

IET Optoelectronics

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The key challenge in free space optical (FSO) communications is combating turbulence‐induced fading. As the channel fading in FSO is quasi‐static, the transmission parameters such as the code rates, transmit power and modulation schemes can be modified with respect to the channel state information transmitted via the feedback path. As a result, adaptive channel coding is considered as one of the practical approaches to improve the FSO link performance. In this study, the FSO system with polar codes is investigated and its performance is analysed by determining the optimum code‐rate required to achieve a bit error rate of 10−9 under weak turbulence. It is shown that, using Monte‐Carlo simulations for the scintillation indices of 0.12 and 0.2, the successive cancelation list (SCL) decoder offers coding gains of 2.5 and 0.3 dB, respectively, as compared with SC decoder, and for the scintillation index of 0.31, the SC decoder offers a coding gain of 2.5 dB compared to that of the SCL decoder for the code rate.

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