A Space-frequency Power Allocation Algorithm for MIMO OWC Systems over Low-Pass Channels (original) (raw)

Energy-Efficient Power Allocation And Performance Estimation For MIMO-MRC Systems

2013

Adaptive power allocation problem where it minimizes the energy-per-good bit (EPG) of a system employing a multiple-input multiple-output maximum ratio combining (MIMO-MRC) scheme is formulated. Closed-form results are obtained for the optimum transmit power and minimum EPG as a function of the number of antennas employed and the quality of the channel. The cumulative distribution function (CDF) of the minimum EPG in closed form is obtained to assess the performance of the solution in a statistically varying channel. The energyefficiency trade-off between enhanced diversity and the increased circuit power consumption of multiple antennas is explored. In particular, EPG CDF in a numerical example is used to find the most energy-efficient number of antennas for a given probability of outage. Both Rayleigh and Rician MIMO fading channels are considered.

Fast Power Allocation Algorithms for Adaptive MIMO Systems

2010

Recent research results have shown that the MIMO wireless communication architecture is a promising approach to achieve high bandwidth efficiencies. MIMO wireless channels can be simply defined as a link for which both the transmitting and receiving ends are equipped with multiple antenna elements. Adaptive modulation and power allocation could be used to further improve the performance of MIMO systems. This thesis focuses on developing a fast and high performance power allocation algorithm. Three power allocation algorithms are proposed in this thesis and their performances are compared in various system sizes and transceiver architectures. Among the three algorithms proposed in this thesis, the fast algorithm may be considered as the best power allocation algorithm since the performance of the fast algorithm is almost as good as the fullsearch (optimal)algorithm and the mean processing time is considerably less than the fullsearch algorithm. The fast algorithm achieves about 97.6%...

Power allocation algorithms in point-to point and interference channels for BIC-OFDM systems

2014

Orthogonal frequency division multiplexing (OFDM) technology, in combination with advanced features such as bit-interleaved coded modulation (BICM) \cite{cai98} and link resource adaptation (LRA) \cite{gold97} and resource allocation techniques (RA), have been identified as the building blocks for future wireless communication systems, in that they can meet the strict quality of service (i.e. high data rate, reliable communications) requirements of the users in the harsh propagation environment of the wireless multipath channel. Due to the proliferation of advanced mobile devices (i.e., smartphones, tablets), a 20-fold increase in data traffic is expected over the next few years, compelling mobile operators to find new ways to significantly boost their network capacity, provide better coverage, and reduce network congestion. In this context, the idea of heterogeneous networks (HetNets), consisting of a mix of short-range and low-cost small cell base stations (SBSs) underlaying the e...

Power Control For Wireless Communication Systems

2013

efficient power control for signals related with randomly dispersed users that are using a single channel which is important in order to conserve the operating life of the battery as well as improving the overall systems capacity. Efficient power control is done by controlling the transmitted power at a given node so that the signal to interference ratio (SIR) of the system does not go above a certain threshold. Hence, channel reuse can be maximized. The distributed power control (DPC) can be used to implement this function as it does not require extensive computational power such as centralized power control methods. The DPC method adjusts the power of each transmitting signal by using local measurements which results in all users maintaining a reasonable SIR. In this paper, we review the DPC method for a wireless network with a single transmitter with random users or receiver nodes via different channels.