Alamouti-type polarization-time coding in coded-modulation schemes with coherent detection

Djordjević, Ivan B.; Xu, Lei; Wang, Ting

doi:10.1364/oe.16.014163

Cited by 32 publications

(3 citation statements)

References 9 publications

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“…The constellation scheme 16QAM is adopted. We choose the LDPC code in [17] due to its low complexity and very low error floor resulted from the absence of 4-cycles in its graph [18]. The sum-product algorithm (SPA) is adopted for iterative soft-decision decoding with the iteration number of 50 [18].…”

Section: Numerical Resultsmentioning

confidence: 99%

Spectrum-efficient coherent optical zero padding OFDM for future high-speed transport networks

Dai

Wang

2012

2012 IEEE Global Communications Conference (GLOBECOM)

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By fully exploiting the optical channel properties, we propose in this paper the coherent optical zero padding orthogonal frequency division multiplexing (CO-ZP-OFDM) for future high-speed optical transport networks to increase the spectral efficiency and improve the system reliability. Unlike the periodically inserted training symbols in conventional optical OFDM systems, we design the polarization-time-frequency (PTF) coded pilots scattered within the time-frequency grid of the ZP-OFDM payload symbols to realize low-complexity multipleinput multiple-output (MIMO) channel estimation with high accuracy. Compared with conventional optical OFDM systems, CO-ZP-OFDM improves the spectral efficiency by about 6.62%. Simulation results indicate that the low-density parity-check (LDPC) coded bit error rate of the proposed scheme only suffers from no more than 0.3 dB optical signal-to-noise ratio (OSNR) loss compared with the ideal back-to-back case even when the optical channel impairments like chromatic dispersion (CD) and polarization mode dispersion (PMD) are severe.

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Section: Numerical Resultsmentioning

confidence: 99%

Spectrum-efficient coherent optical zero padding OFDM for future high-speed transport networks

Dai

Wang

2012

2012 IEEE Global Communications Conference (GLOBECOM)

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“…In this context, the STBC codes are referred to, more appropriately, as polarization-time (PT) codes. PT codes have also been applied in PDM systems for other applications, including PMD compensation [4], [5], and mitigating polarization-dependent loss (PDL) [6]. Recently, PT codes have also been proposed for training-aided joint frame and frequency synchronization in single-carrier PDM systems [7].…”

Section: Introductionmentioning

confidence: 99%

Robust Frame and Frequency Synchronization Based on Alamouti Coding for RGI-CO-OFDM

Omomukuyo

Chang

Dobre

et al. 2016

IEEE Photon. Technol. Lett.

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Abstract-We propose an algorithm for carrying out joint frame and frequency synchronization in reduced-guard-interval coherent optical orthogonal frequency division multiplexing (RGI-CO-OFDM) systems. The synchronization is achieved by using the same training symbols (TS) employed for trainingaided channel estimation (TA-CE), thereby avoiding additional training overhead. The proposed algorithm is designed for polarization division multiplexing (PDM) RGI-CO-OFDM systems that use the Alamouti-type polarization-time coding for TA-CE. Due to their optimal TA-CE performance, Golay complementary sequences have been used as the TS in the proposed algorithm. The frame synchronization is accomplished by exploiting the cross-correlation between the received TS from the two orthogonal polarizations. The arrangement of the TS is also used to estimate the carrier frequency offset. Simulation results of a PDM RGI-CO-OFDM system operating at 238.1 Gb/s data rate (197.6-Gb/s after coding), with a total overhead of 9.2% (31.6% after coding), show that the proposed scheme has accurate synchronization, and is robust to linear fiber impairments.Index Terms-Coherent optical orthogonal frequency division multiplexing (CO-OFDM), optical fiber communication, polarization division multiplexing (PDM), synchronization.

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“…In [10] we have proposed and demonstrated a PMD-tolerable DD-OFDM transmission using the polarization-time coding (PTC) which makes the receiver colorless, insensitive to input SOP, and transparent to both data format and bandwidth. The PTC approach, which has its origin in the wireless space-time coding [13], has earlier been introduced to the coherent optical systems for realizing the polarization insensitive receiver with enhanced PMD tolerance [14,15]. However, in the regime of direct-detection systems, to the best of our knowledge, this PTC approach has still lacked extensive studies so far.…”

Section: Introductionmentioning

confidence: 99%

Joint compensation of CD and PMD in direct-detected OFDM transmission using polarization-time coding

Peng¹,

Feng²,

Chi³

2010

Opt. Express

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We propose and demonstrate a polarization-time coding (PTC) method which can effectively compensate both the CD and first order PMD in direct-detected OFDM transmission. Compared with the previous methods, the proposed PTC not only alleviates the need for the complex dynamic polarization controller but also exhibits superior transparencies to both the OFDM format and transmission data rate. For the proposed PTC method, we have analytically derived the transmission model with CD and first order PMD, and theoretically prove the PTC indeed can jointly compensate both CD and PMD. The numerical results show that, with the PTC method, both the previously proposed gapped and interleaved OFDM formats behave virtually immune to both CD and PMD with a price of 3-dB OSNR penalty in back-to-back (BtB). Aimed to mitigate this BtB 3-dB penalty, further partial PTC approach is proposed for trading the PMD tolerance with the BtB OSNR sensitivity. The interleaved OFDM system is found to gain profits in terms of lower sensitivity with the partial coding.

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Alamouti-type polarization-time coding in coded-modulation schemes with coherent detection

Cited by 32 publications

References 9 publications

Spectrum-efficient coherent optical zero padding OFDM for future high-speed transport networks

Spectrum-efficient coherent optical zero padding OFDM for future high-speed transport networks

Robust Frame and Frequency Synchronization Based on Alamouti Coding for RGI-CO-OFDM

Joint compensation of CD and PMD in direct-detected OFDM transmission using polarization-time coding

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