Original MAC frame formats have been developed to provide recommendations for new protocol designs in OFDMA-PONs. The portrayed scalability of the Dynamic Subcarrier Allocation (DScA) protocol is complemented by the granularity of hybrid OFDMA/TDMA topologies. Modelling of the DScA performance in OPNET has recorded the maximum 312.5 Mbits/s transmission rate capacity per ONU achieved at less th...

To extend the coverage and capacity of Heterogeneous Networks (HetNets), femtocells (HeNodeBs) has been impressive to deploy in in-house or apartment. Owing to co-channel spectrum involvement these HeNodeB sources CoTier interference (CTI) with neighbor HeNodeBs and users of HeNodeB (HUE) in orthogonal frequency division multiplexing Access (OFDMA). As a result, CTI is occurred which causes of ...

Standardization efforts towards achieving 4G objectives have resulted in the development of Orthogonal Frequency Division Multiple Access (OFDMA) technology. The flexible frequency assignment enabled by OFDMA allows for the introduction of new network elements such as distributed antenna ports, femto base-stations, and relays, and new coordinated multipoint (CoMP) transmission and reception tec...

For Orthogonal Frequency Division Multiple Access (OFDMA) system module, there is a need for an efficient alterable point FFT processor. Therefore, it is meaningful to design a FFT processor for which input data points could be alterable. In this paper the variable input FFT processor is designed to meet the requirements of OFDMA system. For this, in this paper we select the 2D Fourier transfor...

Wireless OFDMA networks enable new and exciting applications but also pose significant technical challenges due to the need for decentralized control, dynamic topology and the characteristics of the wireless channel. Cooperative cross-layer design is a promising method to satisfy the network requirements. In wireless OFDMA networks working in an ad hoc model, link asymmetry exists because of th...

Orthogonal frequency division multiple access (OFDMA) is considered as one of the technologies for 4 generation (4G) due to its robustness against multi-path environment. OFDMA also has the advantage of flexibility in resource allocation, which cannot be supported by existing duplex schemes. In this paper, we propose dynamic hybrid duplex (DHD) which will enhance the efficiency and flexibility ...

The Future Wireless Communication requires 100 Mbits/s Data rate, streaming audio/video, asymmetric access/multiple access, Adaptive modulation and coding, dynamic packet arrangement, smart antenna adaptation andIPv6 facility to enhance error free communication. Various digital modulation techniques have been taken for simulation and bit error rate is calculated in both MC-CDMA System and OFDMA...

In the paper “Finite-SNR Diversity-Multiplexing Tradeoff for Network Coded Cooperative OFDMA Systems”, the authors adopt a recently proposed subcarrier allocation algorithm aiming at providing optimal frequency diversity to an OFDMA-based network with network-coded cooperation (NCC), where P source nodes transmit independent information to a common destination with the help of M relay nodes, in...

Proportional fair resource allocation plays a critical role to enhance the performance of slow adaptive orthogonal frequency division multiple access (OFDMA) system. In slow adaptive OFDMA system, the subcarrier allocation is updated at the beginning of every time window and the channel gain of users at the time of the subcarrier allocation could not be known precisely. This leads to the challe...

The challenge of self-optimization for orthogonal frequency-division multiple-access (OFDMA) interference channels is that users inherently compete harmfully and simultaneous water-filling (WF) would lead to a Pareto-inefficient equilibrium. To overcome this, we first introduce the role of environmental interference derivative in the WF optimization of the interactive OFDMA game and then study ...