Non-orthogonal multiple access (NOMA) is a key to multiple access techniques for the next generation 5G wireless communication networks. In this paper, to improve the performance gain of NOMA system, a cooperative fixed decode-andforward (DF) relay system model based on NOMA (CRS-NOMA) is studied over Rician fading channels, considering the achievable rate of signals as the performance metric. ...

In this chapter, a cooperative broadband relay-based resource allocation technique is proposed for adaptive bit and power loading multiple-input-multiple-output/orthogonal frequency division multiplexing (MIMO-OFDM) system. In this technique, sub-channels allocation, M-QAM modulation order, and power distribution among different sub-channels in the relay-based MIMO-OFDM system are jointly optim...

In this article, an orthogonal projection signal alignment (OP-SI) scheme is proposed for multiple-input and multiple-output (MIMO) relay systems, and the user performance is studied with and without perfect channel state information (CSI). Particularly we focus on an important scenario in cellular systems, where the base station exchanges messages with multiple users via a relay. By jointly de...

JNCC seamlessly couples channel coding and network coding to effectively combat the detrimental effect of fading of wireless channels. In this paper we used Joint Network-Channel Coding scheme, for reliable multiple access relay channel. Specifically, JNCC combines irregular lowdensity parity-check (LDPC) channel coding and random linear network coding through iterative joint decoding, which he...

The material in this paper is published in “Cooperative Wireless Communications” , Auerbach Publications, Taylor and Francis Group, CRC Press, 3-24, ISBN 142006469X, Oct. 2008. ABSTRACT. This chapter focuses on three cooperative channels: the relay channel, the broadcast channel with cooperating receivers and the multiple access channel with cooperating transmitters. The chapter comprises two m...

In a bi-directional relay channel, two nodes wish to exchange independent messages over a shared wireless half-duplex channel with the help of relays. Recent work has considered information theoretic limits of the bi-directional relay channel with a single relay. In this work we consider bi-directional relaying with multiple relays. We derive achievable rate regions and outer bounds for half-du...

In this paper, a new adaptive hybrid multiple-input multiple-output (MIMO) cooperative scheme is proposed in wireless OFDM systems. The conventional hybrid MIMO cooperative scheme is inefficient in the relay because the relay does not use one antenna between two antennas for transmission to the destination. So the new hybrid MIMO cooperative scheme supplements inefficiency of the conventional s...

We propose a novel multicast scheme that can provide qualityof-service (QoS) to multicast service over IEEE 802.11 wireless LANs by utilizing medium access control (MAC) layer relay. It is well known that IEEE 802.11 provides a physical layer multi-rate capability in response to different channel conditions, and hence packets may be delivered at a higher data rate through a relay node than thro...

While both fundamental limits and system implementations are well understood for the point-to-point communication system, much less is developed for general communication networks. This thesis contributes towards the design and analysis of advanced coding schemes for multi-user communication networks with structured codes. The first part of the thesis investigates the usefulness of lattice code...