A sequential cancellation scheme and its improvement is given in this paper for multi-user detection. Multi-user detection is expected to enhance capacity of the Wideband CDMA scheme. This scheme is composed of (a) estimation and compensation of phase rotation using a pilot signal in multi-pass environment, and (b) iterative calculation of a target signal and its interference. This scheme has b...

A novel iterative receiver is proposed for relay-assisted multiuser communications in which multiple users transmit to a destination with the help of a relay and using fast frequency-hopping modulation. Each user employs a channel encoder to protect its information and facilitate interference cancellation at the receiver. The signal received at the relay is either amplified, or partially decode...

In this paper the system model of a fully synchronised interleave division multiple access (IDMA) scheme without channel coding is transformed into a new but equivalent matrix model. This model allows for alternative insights into the principles of IDMA and we show that the arising matrices are highly structured and very sparse. Based on this model, the optimal detector for IDMA is derived and ...

It is well-known that, in DS-CDMA downlink signal transmission, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace rake combining to achieve much improved bit error rate (BER) performance in severe frequencyselective fading channel. However, in uplink signal transmission, as each user’s signal goes through a different channel, a severe multi-user...

Recent wireless testbed implementations have proven that full-duplex communication is in fact possible and can outperform half-duplex systems. Many of these implementations modify existing halfduplex systems to operate in full-duplex. To realize the full potential of full-duplex, radios need to be designed with self-interference in mind. In our work, we use a novel patch antenna prototype in an...

We study the improvement technique for multistage parallel interference cancellation (PIC) DS-CDMA multiuser receivers, which cancel only a fraction of the estimated multiple access interference (MAl) at each receiver stage. This technique takes into account the fact that the MAl estimate, especially in the earlier stages, contains substantial error, and a relatively conservative strategy of us...

In this paper, we propose a new joint transmit and receive spatial/frequency-domain filtering for single-carrier (SC) multipleinput multiple-output (MIMO) eigenmode transmission using iterative interference cancellation (IC). Iterative IC is introduced to a previously proposed joint transmit and receive spatial/frequency-domain filtering based on minimum mean square error criterion (called join...

A new puke position modulation code division multiple access (PPM-CDMA) system is proposed for an indoor optical wireless channeL As a signature sequence for CDMA an optical orthogonal code (OOC) is used To reduce multiple access interference, two interference cancellation schemes are employed: decorrelating detection and successive interference cancellation (SIC). The bit error rate of the pro...

Full-duplex Wireless: Design, Implementation and Characterization. by Melissa Duarte One of the fundamental assumptions made in the design of wireless networks is that the wireless devices have to be half-duplex, i.e., they cannot simultaneously transmit and receive in the same frequency band. The key deterrent in implementing a full-duplex wireless device, which can simultaneously transmit and...