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Sub-Lambda Photonically Switched Network (SLPSN) solutions are able to improve the use of capacity in data networks while limiting the growth of energy consumption. Recently, we have proposed the TIme and Spectral optical Aggregation (TISA) concept in order to respond to operator's needs of flexibility in the allocation of network resources. Additionally, the TISA solution makes a better use of already...
We have demonstrated a rectangular microwave photonic filter (MPF) based on stimulated Brillouin scattering (SBS) effect in optical fiber and offering tunability on bandwidth, central frequency, and selectivity. A sweeping-pump multistage configuration with feedback control is implemented to achieve the rectangular MPF with high selectivity. The obtained 20-dB shape factor is as low as 1.056, which...
This paper presents the hardware implementation of a Direct-Sequence Spread Spectrum (DSSS) modem with networking capability for underwater acoustic sensor networks. The hardware platform uses the Texas Instrument Digital Signal Processor (DSP) for physical layer transmission/receiving and microcontroller for network layer control and node ID detection. The system uses 125 kHz single carrier with...
This paper investigates the throughput performance using adaptive modulation and coding (AMC) focusing on the causes of impairment to Orthogonal Frequency Division Multiplexing (OFDM) - Multiple-Input Multiple-Output (MIMO) multiplexing. We first investigate the influence of a limited number of modulation and coding schemes (MCSs) and channel estimation error for MCS selection based on mutual information...
This paper presents the effect of joint modulation and coding scheme (MCS) selection on a turbo soft interference canceller (SIC) for OFDM-MIMO multiplexing using adaptive modulation and coding (AMC). We use a turbo SIC to detect signals by performing iterative interference cancellation using soft-symbol estimates based on the a posteriori log-likelihood ratio (LLR) at the Max-Log-MAP decoder output...
This paper proposes a frequency synchronization algorithm for time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) system with multiple antenna transmit diversity. The training sequences used in the transmit diversity TDS-OFDM system are orthogonal and have near-optimal autocorrelation property, and the carrier frequency offset (CFO) estimation algorithm is based on these...
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