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Limited feedback scheduling algorithms for multiuser MIMO-OFDM is discussed for heterogeneous network in the sense that SNR for all users are not equal. Users at a particular distance from base station are grouped together and have same SNR assuming that they have same multipath profile and shadowing effect. In this paper, closed-loop system is considered where mobile terminals feedback channel quality...
We consider the resource allocation (RA) optimization problem in shared spectrum access communications system, and propose efficient solutions for both inter-operator and intra-operator RA optimization problems. For inter-operator RA optimization, we present a spectrum sharing framework that primarily focuses on fairness issues for the spectrum sharing operators, by taking care of the sharing policy...
In this paper the overview of turbo coding technique applying to orthogonal parallel data transmission via sub-channels is provided and soft-input soft-output maximum a posteriori algorithm is proposed for using in parallel data transmission.
Exponential growing of wireless multimedia communications has forced the IEEE802.11 workgroup to define new standard of WLAN. It is named a Very High Throughput WLAN IEEE 802.11ac which exploits MIMO-OFDM technology to provide up to 6,9Gbps of throughput. MIMO decoder is the vital part of WLAN 802.11ac. It decodes the received signals to get back the transmitted information. There are many methods...
In this paper, we propose a distributed, self-organizing, adaptive and semi-static Soft Frequency Reuse based downlink Inter-Cell Interference Coordination scheme for an LTE system to increase the throughput of cell-edge users. Cells are able to self-organize the allocation of frequency sub-bands for cell-edge users using a distributed algorithm without requiring extensive pre-planning needed for...
LTE - A is a standard account for adaptive connectivity between supporting base stations (eNB) and corresponding radio head (RH). In this paper we elaborate on characterizing the effect of N-CoMP (Non-Coordinated Multi Point) and CoMP(Coordinated Multi Point) with interference. We analyses both technique in LTE-A network with two transmission point connectivity of UE. A significant performance improvement...
Modulation classification is a technique to achieve blind estimation of modulation types. Thereby, signaling overhead can be reduced or equivalently spectrum efficiency can be improved. However, the benefit is limited in coded systems, since the code rate information have to be signaled anyway. To fulfill the requirement of higher spectrum efficiency in 5th generation (5G) systems, a method of constellation...
In this paper, semi-orthogonal frequency multiplexing (SOFDM) is proposed, which has doubled spectral efficiency over OFDM by halving the subcarrier spacing. SOFDM is orthogonal in real field but non-orthogonal in complex field. To cancel the inter carrier interference caused by non-orthogonality, linear equalization algorithms are introduced based on inter carrier cross-correlation matrix. However...
This paper, we evaluate the performance study of Long Term Evolution-LTE downlink with multiple input and multiple outputs (MIMO) system. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate...
Long Term Evolution (LTE) holds the promise to enhance the capacity and speed of mobile communication by supporting Multimedia Broadcast/Multicast Services (MBMS) over a single frequency network (MBSFN), where numerous cells transmit an identical waveform that is synchronized in time for a specific time interval. For improving the performance of SFN, ultra-extended cyclic prefix duration has been...
In this paper, we consider a relay enhanced device to device communication under Decode and Forward (DF) communication mode. The power allocation at the source as well as at the relay nodes is optimized in both cellular and D2D systems to enhance the sum throughput of the system. A joint power optimization problem for orthogonal frequency division multiplexing (OFDM) based transmission is formulated...
This paper uses a novel set of functions to model the relay selection process in a scenario of cooperative wireless communications. We define a utility function that reflects the behavior and influence that a selected relay may have on the quality of the link to be established for the forwarding of data. The utility function takes into account also the strategies of other players. To this end, we...
Protecting and hiding the transmission of information over wireless channels at the physical layer level is of great importance in several applications. An Ad-Hoc covert network (ACN) is a set of users that exchange information over a wireless channel with a low probability of being detected by an intercept receiver. The ACN achieves a low probability of detection by hiding its transmission within...
This paper presents outdoor field experimental results to clarify the 4x4 MIMO throughput performance from applying multi-point transmission in the 15 GHz frequency band in the downlink of 5G cellular radio access system. The experimental results in large-cell scenario shows that up to 30 % throughput gain compared to non-multi-point transmission is achieved although the difference for the RSRP of...
The LTE (Long Term Evolution) technology is expected to offer a number of distinct advantages over other wireless technologies. Scarcity of spectrum had encouraged regulator and provider to refarmed the spectrum. Spectrum refarming for LTE in 900MHz, 1800 MHz or 2100 MHz frequencies band is considered to trigger the potential degradation of existing services such as GSM and UMTS. The simulation's...
LTE is the next step of the broadband cellular technology evolution. It is referred as the fourth generation (4G) technology which offers better performance in throughput, latency, and spectral efficiency. It uses OFDM that is proven to combat inter-symbol-interference (ISI), multipath fading, and enabling scalable bandwidth allocation. Downlink LTE uses OFDM technology variation called OFDMA which...
Femtocell networks provide a good opportunity to satisfy increasing user demand for high data rate services. One of the most important challenges in femtocell networks is interference which degrades the overall system throughput considerably. In order to successfully deploy a femtocell network, efficient resource allocation algorithms and interference mitigation techniques should be deployed. In this...
Increased demand for higher user throughput has led to deployment of multi-layer networks commonly called heterogeneous networks (Hetnets). Therein, small cells are deployed alongside traditional macro cells, in many cases on the same spectrum. Such scenarios complicate the configuration of network parameters such as the Physical Cell Identity (PCI). A number of approaches have as such been proposed...
In this 15.875paper, we propose a method to achieve high data rates using a shortened orthogonal frequency division multiplexing (OFDM) frame format in the physical layer (PHY) for narrowband power line communication (NB PLC) systems. The new frame structure will combine the preamble and information in the same OFDM symbol so that the overhead from the preamble is reduced. Then we consider the optimal...
This paper presents a new eight-parallel multi-path delay commutator (MDC) FFT processor based on the novel modified radix-26 FFT algorithm. The proposed FFT processor can achieve a high throughput and a low hardware complexity by using the efficient scheduling scheme that reorders data-paths. The proposed scheduling scheme and CSD approach can reduce the number of complex multipliers.
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