We propose an adaptive loading algorithm to flexibly tailor each OFDM subcarrier in three dimensions including modulation formats, power and FEC codes. With look-up table operation introduced, the iterations are notab...
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ISBN:
(纸本)9784885523052
We propose an adaptive loading algorithm to flexibly tailor each OFDM subcarrier in three dimensions including modulation formats, power and FEC codes. With look-up table operation introduced, the iterations are notably reduced without performance sacrifice.
Detailed statistical investigations of the effectiveness of three widely adopted optical orthogonal frequency division multiplexing (OOFDM) adaptive loading algorithms, including power loading (PL), bit loading, and b...
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Detailed statistical investigations of the effectiveness of three widely adopted optical orthogonal frequency division multiplexing (OOFDM) adaptive loading algorithms, including power loading (PL), bit loading, and bit-and-power loading (BPL), are undertaken, for the first time, over 1000 statistically constructed worst-case multimode fiber (MMF) links without incorporating inline optical amplification. It is shown that the BPL (PL) algorithm always offers the best (worst) transmission performance. The absolute transmission capacity differences between these algorithms are independent of signal bit rate and increase with both transmission distance and digital-to-analog converter/analog-to-digital converter (DAC/ADC) sampling rate. More importantly, numerical results also indicate that, for both worst-case and normal-case MMF links of less than 300 m, in comparison with the most sophisticated BPL algorithm, the simplest PL algorithm is sufficiently effective in escalating the OOFDM MMF system performance to its maximum potential. The effectiveness of the PL algorithm can be further improved when a large number of subcarriers are utilized. On the other hand, for relatively long MMF links (> 800 m) with their 3-dB bandwidths being much less than the transmitted OOFDM signal spectrum, the BPL algorithm has to be adopted. The aforementioned results have great potential for practical cost-effective OOFDM transceiver architecture design.
In this paper, we propose the use of bit and power allocation procedure to optimize the use of eigenmodes for multiple antenna systems. We design an adaptivealgorithm that exploit the Channel State Information (CSI) ...
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ISBN:
(纸本)9781424453467
In this paper, we propose the use of bit and power allocation procedure to optimize the use of eigenmodes for multiple antenna systems. We design an adaptivealgorithm that exploit the Channel State Information (CSI) available at the transmitter by adapting the transmitted signals in order to enhance the system's performance using adaptive bit and power allocation. We simulate and evaluate its performance in the presence of spatial fading correlation in order to illustrate the effectiveness of the proposed adaptivealgorithm in realistic environments. We show the interest of adaptive processing in the presence of spatial correlation in MIMO channel.
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