Light Fidelity (LiFi) technology has gained attention and is growing rapidly today. Utilizing light as a propagation medium allows LiFi to promise wider bandwidth than existing Wireless (WiFi) enables the implementation of cellular improve utilization. In addition, very attractive because it can utilize lighting facilities consisting light-emitting diodes (LEDs). A system that uses intensity mo...

Orthogonal frequency division multiplexing (OFDM) is particularly divided to three varieties. Cyclic prefix OFDM, zero padding OFDM, and time domain synchronous OFDM. Compared to CP OFDM, TDS-OFDM has higher spectral efficiency and faster synchronization. This paper reviewed however efficiently uses the compressive sensing (CS) theory to resolve those problems. During this paper, a noise cancel...

Abstract: Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM) can bridge the conventional OFDM and single carrier (SC) transmission by using minimum mean square error (MMSE) frequencydomain equalization (FDE). The channel frequency-selectivity can be exploited by MMSE-FDE to improve the bit error rate (BER) performance. A much better BER performance ...

In this paper, a Peak to Average Power Ratio (PAPR) reduction technique in Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. This technique uses error correction capability of channel coding to reduce the PAPR.The coded bits at the input of OFDM modulator are separated into two groups of the Most Significant Bits (MSB) and the LeastSignificant Bits (LSB). The bits are mappe...

In Spectrally Efficient Frequency Division Multiplexing (SEFDM) systems the input data stream is divided into several adjacent subchannels where the distance of the subchannels is less than that of Orthogonal Frequency Division Multiplexing (OFDM) systems. Since the subcarriers are not orthogonal in SEFDM systems, they lead to interference at the receiver side. In this paper, an iterative metho...

Abstract— In this paper, we propose the use of verticalBell Labs layered space-time (V-BLAST) detection for orthogonal frequency division multiplexing code division multiplexing (OFDM-CDM) systems. Considering the properties of the VBLAST detection as well as the frequency diversity from CDM, we propose a new CDM transform matrix to improve the performance of V-BLAST detection of OFDM-CDM signa...

We propose an orthogonal frequency division multiplexing frequency division multiple access (OFDMA) system with an adaptive multiple antenna transmission scheme for future wireless communkatlon systems. In the system, both a transmit diversity scheme with high order modulation and a spatial multiplexingscheme with low order modulation are employed for the given spectral efilciency, between whic...