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Throughput starvation, which occurred under well-known exposed/hidden terminal problem in CSMA/CA based channel access mechanisms, will be a critical problem for future wireless LAN systems. This paper describes new schemes that identify starved access points (APs) and user equipments (UEs). One scheme identifies starved APs by observing the delay of beacon signals periodically transmitted by APs...
The first giga-bit class wireless local area network (wireless LAN) below 6 GHz frequency (the IEEE 802.11ac standard) is attracting attention due to its capability of handling much more of the rapidly growing data traffic. The increased density of wireless LAN access points (APs), however, has induced inter-cell interference that severely degrades system performance. This problem seems to be getting...
Frequency-dependent IQ imbalance will be one of the degrading factors for future wideband wireless communication systems. This paper presents a blind compensation scheme for the frequency-selective IQ imbalance that occurs in wideband OFDM transceivers. The proposed scheme uses 2-tap filters having weights calculated by a constant modulus algorithm, which does not require any training or pilot signals...
This paper describes ultrahigh capacity transmission based on spectrally-efficient multi-level modulation and wideband optical amplification techniques. 21.4-Gbaud polarization-division multiplexed (PDM) 16-ary quadrature amplitude modulation (QAM) signals are generated by utilizing an optical synthesis technique, wavelength-multiplexed with 25-GHz spacing by optical pre-filtering, and received by...
A blind spectrum-based frequency offset estimator with fast tracking time is presented. A receiver using the proposed estimator to eliminate the frequency ambiguity of the mth power algorithm can achieve precise estimation over a wide frequency range.
We demonstrate 11.2-Tb/s transmission of 12.5-GHz spaced 120-Gb/s PDM 64-QAM signals over 160 km by using a digital coherent receiver with pilotless demodulation algorithms. The spectral efficiency of 9.0 b/s/Hz is the highest reported for 100-Gb/s/ch-class transmission.
We evaluate the OSNR tolerance of 111Gb/s No-guard interval OFDM signal using low sampling rate analogue-to-digital converter. The back-to-back experiment shows that the OSNR penalty is less than 0.1dB when using 1.4 times oversampling rate.
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