Multiple-Symbol Differential Sphere Detection Aided Successive Relaying in the Cooperative DS-CDMA Uplink

The conventional amplify-and-forward cooperative system is capable of achieving a superior performance with the aid of Multiple-Symbol Differential Sphere Detection (MSDSD), when compared to conventional differential detection (CDD) for transmission over time-selective channels. However, the conventional broadcast/cooperative twin-phase based relaying protocol encounters a 50% throughput loss imposed by half-duplex relaying. For combating this problem, in this paper, we create a MSDSD aided successive relaying based cooperative DS-CDMA system. We demonstrate that given the target BER of 10?4 , a diversity gain of up to 10 dB is achieved over the benchmark schemes employed without a throughput loss

A survey of self organisation in future cellular networks

This article surveys the literature over the period of the last decade on the emerging field of self organisation as applied to wireless cellular communication networks. Self organisation has been extensively studied and applied in adhoc networks, wireless sensor networks and autonomic computer networks; however in the context of wireless cellular networks, this is the first attempt to put in perspective the various efforts in form of a tutorial/survey. We provide a comprehensive survey of the existing literature, projects and standards in self organising cellular networks. Additionally, we also aim to present a clear understanding of this active research area, identifying a clear taxonomy and guidelines for design of self organising mechanisms. We compare strength and weakness of existing solutions and highlight the key research areas for further development. This paper serves as a guide and a starting point for anyone willing to delve into research on self organisation in wireless cellular communication networks

MULTfflOP MOBILE CELLULAR NETWORK

Code Division Multiple Access (CDMA) system capacity is interference limited. Distance of the mobile station (MS) to the base station (BS) affects the capacity and interference of a cellular network system. Relaying is to shorter the distance between BS and MS by adding a relay station (RS) between them. Transmission power is smaller due to shorter distance and thus improves the capacityof the CDMAsystem due to reduction in interference. Relaying can be done by using fixed relay station or mobile relay station. Both objectives are to improve the capacity and reduce interference but they are different since fixed relay station is constructed on land or building while mobile relay station is additional features added into mobile phones. This project shows the benefits of multihop with mobile relay station which improve the interference by relaying compared to thesystem without relaying