No abstract

No abstract

Multiple Input Multiple Output (MIMO) techniques are used to exploit spatial diversity and to achieve high bit rates required for emerging multimedia applications. Cooperative communication can be used to achieve the diversity gains typical of MIMO without the need for multiple antennas on the consumer units. In this paper, we investigate the use of receiving node (destination) cooperation. We evaluate the performance of destination cooperation in an interference channel (DC-IC). We compare the performance of this system with the baseline 2-user orthogonal channel method. We demonstrate that the 2-user DC-IC outperforms the baseline technique by far. This is due to the cooperative communication. In the cooperative scheme, the receiver nodes in the first time slot, decode the received information from both sources while in the second time slot they cooperate. The scheme provides both diversity and coding gain. Using a typical scenario, we illustrate the efficiency of employing such technique with and without channel coding. However, the proposed technology can be applied to consumer mobile communication devices such as smart phones, tablets, etc… Index terms 1 −Cooperative communications, Interference channel, relay channel, Turbo coding. I. INTRODUCTIONIn cooperative wireless communication, the relaying process is crucial for overcoming the path loss experienced due to the large distance between the source and destination. The broadcast nature of a wireless communication channel is exploited by receiving the same copy of the message over the destination nodes. The closest user node (other than the destination) that is able to decode the message correctly can help the destination.To achieve similar spatial diversity gain to MIMO systems without having multiple collocated antennas at each node, one can achieve cooperative diversity through additional nodes relaying information between source and destination nodes.There are two basic modes of operation for the cooperating node [4]: amplify and forward (AF) where the cooperating node just amplifies the signal and forwards it to the destination, and decode and forward (DF) where the cooperating node decodes the message then re-encodes, modulates and forwards it to the destination. Recently, other protocols like estimate and forward (EF) [8] and compress and forward (CF) [6] have been shown to improve system performance.The earliest work on interference channel (IC) was initiated by Shannon [3], and then continued further by Ahlswede [7]. However, the problem of determining the capacity of an IC has been an open problem for the past thirty years. In [1], the authors are assuming that the channel is full duplex and transmission is occurring in the same band at the same time.

No abstract

No abstract