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With careful designs to combat fibre nonlinearity, 4 × 1.93 Tbit/s 8-PSK DFT-S OFDM transmission over 2240 km SSMF is experimentally demonstrated. The spectral efficiency within each superchannel is 5.6 bit/s/Hz.
Energy consumption of information and communication industry has generated increasing concerns recently, aiming at reducing power consumption or increasing energy efficiency. This paper proposes an energy efficient hybrid structure which introduces micro sites into traditional OFDMA cellular systems with only central macro base stations (BSs). The deployment of small and low power BSs alongside the...
Real-time CO-OFDM transmitters and receivers for 10.5Gb/s bit-rate implemented in FPGAs are reported applying 10GSa/s converters and entire algorithms for both terminals. The Q-factors are 22.7dB for the transmitter and 17.8dB for the receiver.
We extended a pilot symbol frequency offset estimation scheme and applied it in combination with a pilot subcarrier compensator. Optimum system sensitivity was found up to few 100 MHz frequency offset.
In this paper, we apply quasi-orthogonal space-time block code through constellation rotation (QOSTBC_CR) in OFDM system, construct the QOSTBC_CR-OFDM code and propose the decoder. Since OFDM can combat frequency-selective channels and the QOSTBC_CR have both full rate and full diversity, the QOSTBC_CR-OFDM performs effectively in frequency-selective channels. Simulation results show that QOSTBC_OR-OFDM...
In this paper, the subcarrier allocation problems for downlink transmission of spatial multiplexing based OFDM systems are investigated. With the goal of maximizing the instantaneous capacity, two categories of subcarrier assignment criteria are derived, that is, exclusive manner based criteria which allocate each subcarrier to a single user, and shared manner based criteria which allow multiple users...
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