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In a previously published transmission technique known as subcarrier index-power modulated optical OFDM (SIPM-OOFDM), a new subcarrier index-power (SIP) information-bearing dimension is introduced to enable SIPM-OOFDM to carry one extra information bit per subcarrier. As a significantly improved variant of SIPM-OOFDM, in this paper, a novel signal...
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Context 1
... making use of the transceiver parameters listed in Table 2 and the optimum parameters identified in Section 3, the maximum achievable signal transmission bit rates of SIPM-OOFDM, conventional OOFDM encoded with QPSK, 8-PSK and 16-PSK, as well as ML-SIPM-OOFDM can be calculated very easily, which are summarized in Table 3, where the average number of bits transmitted per subcarrier is also listed for each transmission technique considered. It can be seen in Table 3 that the proposed technique gives rise to a signal transmission bit rate of 26.80Gb/s, which significantly exceeds 16-PSK-encoded OOFDM and QPSK/8-PSK- encoded SIPM-OOFDM by approximately 13% and 30%, respectively. ...
Context 2
... making use of the transceiver parameters listed in Table 2 and the optimum parameters identified in Section 3, the maximum achievable signal transmission bit rates of SIPM-OOFDM, conventional OOFDM encoded with QPSK, 8-PSK and 16-PSK, as well as ML-SIPM-OOFDM can be calculated very easily, which are summarized in Table 3, where the average number of bits transmitted per subcarrier is also listed for each transmission technique considered. It can be seen in Table 3 that the proposed technique gives rise to a signal transmission bit rate of 26.80Gb/s, which significantly exceeds 16-PSK-encoded OOFDM and QPSK/8-PSK- encoded SIPM-OOFDM by approximately 13% and 30%, respectively. The fact that ML-SIPM-OOFDM has the ...
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We introduces a novel architecture for next generation passive optical network (PON) based on the employment of sparse code multiple access (SCMA) combined with orthogonal frequency division multiplexing (OFDM) modulation, in which the binary data is directly encoded to multi-dimensional codewords and then spread over OFDM subcarriers. The feasibil...
Citations
... Satisfying quality of service (QoS) is an essential requirement for several emerging applications over wireless networks. Therefore, bit loading, or adaptive modulation, for multicarrier systems such as orthogonal frequency division multiplexing (OFDM) has attracted extensive attention in the literature as reported in [1]- [13], and the references listed therein. In most of the work reported in the literature, the goal is to adapt the modulation order for each subcarrier in order to maximize the throughput, while meeting a prespecified bit error rate (BER) threshold [12]. ...
This paper presents a novel efficient receiver design for wireless communication systems that incorporate orthogonal frequency division multiplexing (OFDM) transmission. The proposed receiver does not require channel estimation or equalization to perform coherent data detection. Instead, channel estimation, equalization, and data detection are combined into a single operation, and hence, the detector performs a direct data detector
($D^{3}$)
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$D^{3}$
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$D^{3}$
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$D^{3}$
outperforms the coherent detector substantially, particularly at high SNRs with linear interpolation. The computational complexity of
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... It converts the received optical signal into the electrical signal by the square-law detection principles. To go near to both high data-rate and long-reach target, multicarrier-based PON such as orthogonal frequency division multiplexing PON (OFDM-PON) has been proposed by overlapping subcarriers to increase the spectral efficiency (SE) [2]. Otherwise, polarization division multiplexing PON (PDM-PON) can also be used to double SE in the given signal-to-noise ratio (SNR) condition [3]. ...
In coherent orthogonal frequency division multiple accessing technique-based passive optical network (CO-OFDMA-PON) uplink transmission, two main multiple-access noises (MNs), which are multiple- state-of-polarization leakages (SOPLs) and phase noises (PNs) inevitably occur by various optical network units (ONUs) and interfere with the uplink signal in this system. These MNs are different by optical devices and paths of each ONU. In this regard, parallel MNs handling per ONU is necessary to provide uplink service. We propose digital phase conjugated pilot-tones (DPC-PTs) based MNs compensation technique. This can deal with MNs by using superposition of two adjacent pilot subcarriers. In the experiments conducted, we applied a pair of DPC-PTs per ONU to handle two MNs and performed parallel processing for each ONU. The transmission performance in terms of root-mean-square error, error-vector magnitude, bit-error-rate (BER), and the overhead of redundant PTs was improved by using the proposed technique in 20-km CO-OFDMA-PON uplink transmission. Both MNs were effectively compensated by comparing transmitted and received DPC-PTs. Minimum overhead of 0.39 % OFDMA symbol duration was verified to meet BER target in the given transmission condition. It guarantees more accurate tracking of SOPL than single-PT-based one due to the doubled number of estimator samples. Besides, more accurate tracking of PNs is demonstrated due to lower noise level between DPC-PTs. As a result, applicability to the phase and polarization diversities-based coherent multiple access is demonstrated through the proposed MNs tracking technique.
... Satisfying quality of service (QoS) is an essential requirement for several emerging applications over wireless networks. Therefore, bit loading, or adaptive modulation, for multicarrier systems such as orthogonal frequency division multiplexing (OFDM) has attracted extensive attention in the literature as reported in [1]- [13], and the references listed therein. In most of the work reported in the literature, the goal is to adapt the modulation order for each subcarrier in order to maximize the throughput, while meeting a prespecified bit error rate (BER) threshold [12]. ...
This work considers the bit loading problem for communication systems that utilize orthogonal frequency division multiplexing (OFDM) in conjunction with precoding (POFDM) or time-domain interleaving (IOFDM). In particular, we propose a new bit loading algorithm for P/I-OFDM that has substantially higher effective throughput and less computational complexity, when compared to bit loading in conventional OFDM systems. The obtained results show that the effective throughput of P/I-OFDM can be more than fourfold the conventional OFDM while the complexity is less than 1.5%. Moreover, the results show that the peak-to-average power ratio (PAPR) properties of the considered systems are preserved under the adaptation process.
... [386], [387], [341], [388], [389], [390], [391], [392], [393] MIMO implementations [48], [307], [394], [395], [396], [397], [52], [398], [399], [400], [401], [402], [43], [45] Optical wireless apps. [58], [403], [404], [405] FQAM [406], [407], [408], [409], [410] Code IM [18], [26], [411], [412] Precoder IM & precoded apps. [413], [16], [414], [415], [416], [417], [418], [40] Extensions [419], [54], [420], [46], [60], [62], [50], [64] Other apps. ...
... In [404], the same research group introduced the concept of non-orthogonal multiple access (NOMA) [426] for SIPM-O-OFDM to more effectively use high power subcarriers and obtained a considerable capacity improvement compared to SIPM-O-OFDM. Finally, the scheme of SIPM-O-OFDM is generalized into its multi-level version in [405] to further improve the data rate of the system by using IM in a more effective way. ...
What is index modulation (IM)? This is an interesting question that we have started to hear more and more frequently over the past few years. The aim of this article is to answer this question in a comprehensive manner by covering not only the basic principles and emerging variants of IM, but also reviewing the most recent as well as promising advances in this field towards the application scenarios foreseen in next-generation wireless networks. More specifically, we investigate three forms of IM: spatial modulation (SM), channel modulation (CM) and orthogonal frequency division multiplexing with index modulation (OFDM-IM), which consider the transmit antennas of a multiple-input multiple-output (MIMO) system, the radio frequency (RF) mirrors (parasitic elements) mounted at a transmit antenna and the subcarriers of an OFDM system for IM techniques, respectively. We present the up-to-date advances in these three promising frontiers, and discuss possible future research directions for IM-based schemes towards low-complexity, spectrum-and energy-efficient next-generation wireless networks.
This paper introduces a novel dimming method for Light Fidelity (LiFi) based on a time-domain sample index modulation (TIM), called indexed dimming (iDim). The aim is to provide a wide brightness range, while maintaining a high signal-to-noise ratio (SNR) performance and a high transmission rate. Direct current optical orthogonal frequency division multiplexing (DCO-OFDM) is used and novel line codes are presented. The system performance is experimentally validated by an implementation on a NI PXIe-1085 and NI-7966R Field Programmable Gate Array (FPGA). Implementation results show that the proposed iDim jointly offers multiple benefits compared to existing dimming methods such as amplitude modulation (AM) dimming. Specially, the lowest optical power of the iDim method is measured at 20 B5W, which is 10 times lower than the measured limit of AM dimming. The iDim system provides a SNR of 22.5 dB for all brightness levels, while the AM-dimming method dramatically reduces its SNR when light is dimmed. The transmission rate of iDim is also higher than DCO-OFDM. This results in up to 40% reduced optical power per bit when compared to sDim, a pulse-width-modulation (PWM)-inspired dimming method. Therefore, iDim is a promising dimming method for applications targeting extremely low illumination levels.
For fully utilizing the system frequency response of optical intensity-modulation and direct-detection (IM/DD) passive optical network (PON) transmission system, this paper demonstrates a novel adaptive quadrature amplitude modulation (QAM) encoder /decoder for bit and power loading based on adaptively modulated orthogonal frequency division multiplexing (AM-OFDM). The applied adaptive QAM encoder/decoder supports all the M-QAM formats on each sub-carrier instead by ranging the order of modulation format on different sub-carriers. Simulation results show that the adaptive QAM coder/decoder can be used for variable transmission channel with different transmission distances between optical line terminal (OLT) and optical network units (ONUs). Meanwhile, the margin-adaptive loading algorithms minimizes the bit error rate (BER) for a given bit rate. In addition, compared the fixed 16QAM scheme, the receiver sensitivity performance of the adaptive QAM scheme is improved by 5.2 dB for 30 km standard single-mode fibre (SSMF) transmission at the -8.12 dB m received optical power (ROP).
A signal transmission technique termed subcarrier index-power modulated optical orthogonal frequency division multiplexing with subcarrier grouping (SIPM-SG-OOFDM) is proposed and investigated, for the first time, which is an improved variant of a previously published subcarrier index-power modulated OOFDM (SIPM-OOFDM). In SIPM-SG-OOFDM, each symbol is divided into multiple subcarrier groups, each of which is assigned with a specific power pattern according to an incoming data sequence. As such, in comparison with conventional OOFDM, extra information bits are conveyed without significantly compromising the transceiver complexity. In addition, subcarrier grouping also offers highly desired zero-overhead automatic error correction at the receiver. Detailed analysis and numerical simulations are undertaken to identify optimum SIPM-SG-OOFDM transceiver parameters and also to explore the corresponding maximum achievable transmission performances over passive optical network systems based on intensity-modulation and direct-detection. It is shown that, compared to SIPM-OOFDM, SIPM-SG-OOFDM not only increases the signal transmission capacity by 11% but also improves the system power budget by approximately 1.0dB. IEEE
We propose and analyze multi-diversity combining and selection to enhance the performance of relay-assisted mixed radio frequency/free-space optics (RF/FSO) system. We focus on a practical scenario for cellular network where a single-antenna source is communicating to a multi-apertures destination through a relay equipped with multiple receive antennas and multiple transmit apertures. The RF single input multiple output (SIMO) links employ either maximal-ratio combining (MRC) or receive antenna selection (RAS), and the FSO multiple input multiple output (MIMO) links adopt either repetition coding (RC) or transmit laser selection (TLS). The performance is evaluated via an outage probability analysis over Rayleigh fading RF links and Gamma–Gamma atmospheric turbulence FSO links with pointing errors where channel state information (CSI) assisted amplify-and-forward (AF) scheme is considered. Asymptotic closed-form expressions at high signal-to-noise ratio (SNR) are also derived. Coding gain and diversity order for different combining and selection schemes are further discussed. Numerical results are provided to verify and illustrate the analytical results.
