In this paper, the energy efficiency of multi-input single-output and orthogonal frequency division multiplexing (MISO-OFDM) communication systems with power and capacity constraints is investigated. By formulating the power allocation problem of MISO-OFDM communication systems, the minimum subchannel transmission power is analyzed with power and capacity constraints. Simulation results indicat...

Multimode PON is considered as a potentially cost-effective solution for a Full Service Access Network. To avoid the limited bandwidth-distance product of multimode fiber when using baseband transmission, passband transmission which utilizes highorder transmission lobes in GHz region of the electrical-domain link frequency responses can be used instead [1]. However, due to the intermodal disper...

In order to improve the throughput performance of Medium Access Control (MAC) schemes in wireless communication networks, some researchers proposed to split the single shared channel into two subchannels: a control subchannel and a data subchannel. The control subchannel is used for access reservation to the data subchannel over which the data packets are transmitted, and such reservation can b...

This paper investigates the problem of dynamic multiuser subchannel allocation in the downlink of OFDM systems. The assumptions are that the channel model is quasi-static and that the base station has perfect channel information. In traditional TDMA or FDMA systems, resource allocation for each user is nonadaptively fixed, and the water-filling power spectrum is known to be optimal. Since the s...

Based on game theory, a distributed power control algorithm with sequential subchannel nulling is proposed for ad-hoc networks. It is shown that the proposed method, by sharing subchannels appropriately according to the interference profiles, can reduce the power consumption of the network while satisfying the target rate of each link. key words: power control, game theory, ad-hoc networks, OFD...

This thesis provides an in-depth analysis of a previously introduced noncoherent ultrawideband (UWB) receiver that uses a parallel autocorrelation frontend to separate a transmitted multichannel signal. The frontend calculates samples of the autocorrelation function of the received signal. Despite this nonlinear operation, a linear multiple-input multiple-output (MIMO) model can be found for th...

The present work is a discussion on the performance analysis of Modified Cooperative Subchannel Allocation (CSA) Algorithms which is used in Alamouti Decoded and Forward (Alamouti DF) Relaying Protocol for wireless multi-user Orthogonal Frequency Division Multiplexing Access (OFDMA) systems. In addition, the performance of approximate Symbol Error Rate (SER) for the Alamouti DF Relaying Protoco...

Recently, multicarrier transmission schemes have been introduced into code-division multiple access (CDMA) systems to gain advantages for high data rate transmission. One of the methods is to transmit identical narrowband direct-sequence (DS) waveforms in parallel over a number of subchannels using frequency diversity. In this paper, we propose a multicarrier CDMA system with an adaptive subcha...

In IEEE 802.16 Wireless Metropolitan Area Networks (WMAN) with Orthogonal Frequency Division Multiple Access (OFDMA) physical layer, dynamic subchannel allocation algorithm (DSAA) is essential for a Base Station (BS) to efficiently utilize bandwidth capacity. Conventional DSAAs usually group all subcarriers into a number of subchannels and allocate subchannels to Subscriber Stations (SS), one f...

In this paper, the pegormance of a multiuser wireless network using OFDM, combined with Power Control and Adaptive Beamforming for uplink transmission is presented. An adaptive power control algorithm is exploited to achieve the desired Signal to Noise and Integerence Ratio (SINR) at each subchannel and increase the power eficiency of the mobile transmitter. Therefol; we can achieve a better ov...