In this paper we analyze the performance of a secondary link in a cognitive radio relaying system operating under a statistical quality of service (QoS) delay constraint. In particular, we quantify analytically the Effective Capacity improvement for the secondary user when it offers a packet relaying service to the primary user packets that are lost under the SINR interference model. Towards th...

In this contribution, we have studied the performance of a Turbo-Coded (TC) Code Division Multiple Access (CDMA) based two-way relaying scheme. More explicitly, we employ a seven-user CDMA model, where two of the CDMA users are communicating with each other with the aid of an additional relay node, while the other five CDMA users are interferers. More explicitly, two CDMA users exchange their i...

In this paper, using relaying broadcast channels (RBCs) as component channels for non-orthogonal multiple access (NOMA) is proposed to enhance the performance of NOMA in single-input single-output (SISO) cellular downlink systems. To analyze the performance of the proposed scheme, an achievable rate region of a RBC with compress-and-forward (CF) relaying is newly derived based on the recent wor...

The cognitive cooperative system with coexisting scenario of multiple primary users and one secondary capable of relaying is considered in this study. The primary users transmit packets in orthogonal subchannels. According to the cognitive principle, the secondary activity cannot interfere with the primary performance. Therefore in this study, the secondary user makes use of the spectrum when s...

In this paper, a cooperative relaying system with α-proportional fair scheduling is proposed for multi-carrier systems. The cooperative relaying provides ’virtual’ MIMO through combining the signals from the source and the relay at the destination in addition to the advantage of the simple relaying which reduces path-loss attenuation in the air interface. We have adopted the α-proportional fair...

—In order to achieve high spectral efficiency with improved peak data rates of cell-edge uses and enable an enhanced network coverage with good throughput both in downlink and uplink, LTE-Advanced proposes separately base station coordination and relaying techniques. In the purpose to increase the cell-edge user data rates beyond what can be reached by using either one of the techniques alone, ...

We propose a practical coding scheme for halfduplex estimate-and-forward relaying. The proposed construction is guided by the information theoretic coding scheme for the estimate-and-forward relay protocol. Our construction incorporates several design features to reduce receiver complexity without compromising performance. Observing that the relaying gain is significant only at low SNRs, we use...

The nodes of wireless communication networks are usually equipped with buffers for temporary data storage as required by many network and transportation layer protocols. For example, in the store-carry-forward protocol employed in delay-/disruption-tolerant networking (DTN), temporally disconnected, intermediate nodes may store data packets until they regain connection to the destination or the...

In this paper, we address the issue of throughputefficient half-duplex constrained relaying schemes for broadband uplink transmissions over multiple-input multiple-output (MIMO) channels. We introduce a low complexity signal-level cooperative spatial multiplexing (CM) architecture that allows for the shortening of the relaying phase without resorting to any symbol detection or re-mapping at the...

Determining the capacity of Gaussian relay channels even with one relaying station has been an open problem for several decades. This paper presents a pair of upper and lower bounds whose gap is no more than 0.5 bit per channel use, for the capacity of Gaussian relay channels with one relaying station.