Evaluating A Resource Allocation Scheme For Coordinated Multi Point

For first design challenge, interference can inflicted by either through average (long term) transmit-power constraints or instantaneous (short term) constraints [4]. The instantaneous constraints have been focused as the second design challenge, handling these constraints

A measure of quality of service in a wireless connection is made using SINR (Signal to noise interference ratio).For the performance evaluation let us consider a an overall network t to be composed of two-tier 19 macrocells, with many femtocells randomly deployed over the macrocells. Then the macro user would be interfered from neighbouring macro cell's (18) and all of the adjacent femtocells. Due to small transmit power, only femtocells which would be located in the 1-tier macrocell area gives interference to macro user. The estimation of the received SINR of a macro user m on subcarrier k, when the macro user is interfered from neighboring macrocells and all the adjacent Femtocells [12] would be given by where P_(M,K) and P_(M^1,K) is transmit power of serving macro-cell M and neighbouring macrocell M’ on subcarrier k, respectively. G_(M,m,K) is channel gain between macro user m and serving macrocell M on subcarrier k. Channel gain from neighbouring macro cells are denoted by G_(M1,m,K) Similarly, P_(F,K) is transmit power of neighbouring femtocell F on subcarrier k. .

Abstract: This paper presents an optimal and secure communication of real time data over a CDMA based IP RAN network. In the process of data transmission, a new coding approach for security enhancement and quality improvement based on spectrum utilization and antenna coding is suggested. The traffic model is developed for image and audio data transmission over a wireless channel, having an interference of AWGN noise with fading effects. An optimal spectrum sensing approach for proper resource allocation is developed, and communicated using the secure WeP protocol. The developed approach is evaluated for different communication parameters and compared in comparisons to conventional modeling of CDMA system. The obtained results illustrates an improvement in quality metrics for the developed system, in comparison to the conventional modeling.

A Macrocell user operating in the same band as femtocell users may cause unacceptably high interference levels, if it is close to the femtocell base station supporting the aforementioned femtocell users, and far away from its own macrocell base station. Additionally, the fact that femtocells can be deployed in an ad hoc fashion anywhere within a macrocell, and can be removed as easily, adds to the critical importance of interference management. Notwithstanding the importance of this issue, the concerns listed above renders jointly optimal design of the two networks impractical due to the complexity and overhead associated with a large dynamic network. Consequently, a computationally manageable yet effective interference management strategy is needed. Interference management has been an important design element for multiuser systems in the past two decades. Judicious receiver design for interference limited systems, e.g., CDMA, and multiuser MIMO, proves useful for interference cancellation [3]. In addition to multiuser detection, transmit power control [4], and joint design of transmitters and receivers [5], [6] offer interference mitigation needed in interference limited systems. We note that while our approach does not involve explicit frequency partitioning between the tiers, i.e., relies solely on the space dimensions, allowing for greater flexibility, it is possible to have our scheme accompany a frequency partitioning scheme and increase the number

Abstract multiple carriers are simultaneously modulated using Orthogonal frequency-division multiplexing (OFDM) which is a transmission technique. Since the OFDM-based system has high spectral efficiency and is robust against intersymbol interference and frequency-selective fading channels. The major problem of this system is high peak-to-average power ratio (PAPR) of transmitted signal which causes distortion of signal.

We can conclude that the reuse of existing sites have a large impact also when a denser MaBS is deployed in order to compensate for wall attenuation. However, the situation is different for the deployment of new sites, unless the carrier aggregation functionality of LTA-A RAT is used. So we can summarize that, the main lack of the next generation network is recognized as limited coverage with small cell solutions like femtocells, picocells deployed with 5G mmW system and Wi-Fi. In another hand, we have the lack of the capacity limited by the macro sites. The solution to these two problems, is to investigate the cooperative layouts of macro sites with femtocells, 5G mmW PBS or Wi-Fi to achieve the trade-offs and the synergies between cost, capacity and coverage.

Thus while Macro cell can provide a wider coverage, in high density areas small cells can be used for data offloading, both indoors and outdoors. This architecture shown in Fig. 1 results in Heterogeneous Network. Thus Het-nets have been introduced in the LTE-Advanced to provide increased throughput and capacity [5]. But there are some implementation issues associated with Het- Nets

In this technique of MIMO system, the signals processing occurs at the transmitter only as the signal processing is restricted at the transmitter therefore it is more beneficial for downlink scenario, because no signals is required at the mobile station. In case of downlink system there is N number of antennas at the receiver with having N number of data stream and each of it is multiplexed and output. There were three techniques used by the MIMO system with antenna processing at the transmitter and having a simple receive structure which is the transient zero forcing scheme, Filter bank method and transmit MMSE. All the interference has been cut by the transmit zero forcing technique whereas the filter bank method is used to minimise the signal to interference ratio in all sub-channels.

The era of new wireless communication is evolving and it will soon penetrate into daily life and change the way we live. The key concept is integrating the 4g capabilities with all of the existing mobile technology. The purpose of this paper is to provide an overview of different aspects of 4g technology which include its features, proposed architecture and key technological enabler.

Abstract— In this paper considers an LTE-Advanced cooperative cellular networks. LTE Release 8 is one of the primary broadband technologies based on OFDM, which is mainly deployed in a macro/microcell layout. It provides improved system capacity, coverage and seamless integration with existing systems. LTE-Advanced significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput, coverage and lower latencies, which leads to better user experience. Also, LTE Release 10 will support the relay networks. The LTE-Advanced features satisfy the IMT-Advanced requirements. The objective of this work is to improve the cell-edge user’s throughput or to extend the coverage area by placing relays in a cell-edge area. When the channel condition between the eNB and UE is not good, then the cooperative communication takes place .The proposed system used the Type II relay station. To utilize the existing resources effectively the RS and eNodeB transmit in the same channel (In-Band) with decode-and-forward strategy. The power dividing method between eNB and RS is proposed to maximize the achievable rate on each subcarrier. This paper proposes the

4G allows IP-based voice, information and streaming multimedia at higher speeds and offers no less than 100 Mbit/s with high versatility and up to 1GBit/s with low portability (traveling). Various advancements thought to be 4G measures incorporate Long Term Evolution (LTE), Ultra Mobile Broadband (UMB) and the IEEE 802.16 (WiMax) standard. At the point when utilized as a part of MIMO frameworks it would have the capacity to give high information rate up to 100Mbps furthermore give QoS and Security administrations to end clients. The 4G goal is to meet difficulties displayed by the perpetually

Due to the fact that OFDMA divides the available frequency spectrum into several orthogonal subcarriers, inter-symbol and inter-carrier interference are minimized, or even eradicated. Also, the assignment of these subcarriers to different users for transmission can be done dynamically, both in frequency and time dimension. This flexibility provides a way of boosting

The booming demand for wireless applications and the relatively low battery capacity in UE puts a premium on achieving high EE. With the growing popularity of green communications, EE is becoming increasingly important. Previous work on energy-efficient resource allocation in OFDMA systems has mainly focused on downlink scenarios. Due to constraints on individual UEs and the discrete nature of sub channel assignment uplink energy-efficient resource allocation is less tractable. In an uplink allocation algorithm is described to maximize the minimum EE among all users.

The concentration of small cells in a network increases; measures need to be taken in order to ensure that the QoS is not degraded for the macrocell users as well as its nearest small cells. Interference managing in Heterogeneous Network in critical position .This is characteristically attained completed bright resource allocation schemes for small cells. In Heterogeneous Network, the mobile network is constructed with layers of small and large cells. This architecture is faced with the task of supply allocation (power, channel, time) for small cells in order to guarantee reliable and high quality service to both primary (macrocell) users as well as secondary (femtocell) users. In mobile network all users can be considered as nomadic, in the form of microcells, hot-spots, circulated antennas and relays becomes predictable. Therefore, for the deployment of the LTE systems the FAPs get a critical inspiring subject, mostly relating to the technical and business influences that it could signify and the method they could be combined efficiently into the LTE building.

In this survey, we will discuss about different cooperative communication schemes like Relay communication and Node cooperative system. Later on we will perform comparison between conventional communication system and cooperative relay scheme based on power efficiency. We will also discuss about various factors that will impact the efficiency of cooperative systems. We will conclude with applications of cooperative communication in LTE advanced.