Closed-loop power control providing maximum capacity of the multicarrier channel with frequency selective Nakagami fading is investigated. Use of the famous Gallager channel capacity (water-filling) theorem with the assumption of limited transmitter power and independent fading in partial channels leads to the algorithm for their optimal power loading. Analytical expressions for the capacity of...

In general the different links of a broadcast channel may experience different fading dynamics and, potentially, unequal or hybrid channel state information (CSI) conditions. The faster the fading and the shorter the fading block length, the more often the link needs to be trained and estimated at the receiver, and the more likely that CSI is stale or unavailable at the transmitter. Disparity o...

In mobile communications systems the channel quality is determined by two physical effects: The short term fading due to scattering, reflections and interference and the long term fading due to the change of the geographical surroundings. Since the influence of the short term fading can be easily reduced by using interleaving techniques, the main channel coding task is to cope with the long ter...

Digital modulation plays a significant role in efficient wireless communication. It allows the transmission of digital data via air on high frequency carrier waves. The worst case communication channel is usually in the urban environment where there are many obstacles. Due to the obstacles and reflectors, the transmitted signal arrives at the receiver from various directions over a multiplicity...

In this paper, the ergodic capacity of parallel channels is investigated with a view to designing the power allocation strategies that optimise this performance measure under the assumption that perfect, instantaneous channel knowledge is available at the receiver whereas the transmitter only has knowledge of the fading distributions and/or the first and second moments of the subchannel gains. ...

A general technique is proposed for the derivation of upper bounds on channel capacity. The technique is based on a dual expression for channel capacity where the maximization (of mutual information) over distributions on the channel input alphabet is replaced with a minimization (of average relative entropy) over distributions on the channel output alphabet. Every choice of an output distribut...

The performance of parallel and serial concatenated codes on frequency-nonselective fading channels is considered. The analytical average upper bounds of the code performance over the Rician channels with independent fading are derived. Furthermore, the log-likelihood ratios and extrinsic information for maximum a posteriori (MAP) probability and soft-output Viterbi algorithm (SOVA) decoding me...

The combination of CDMA and space time block coding (STBC) has been proposed for indoor environment where the delay spreads are very small and the channel is flat fading. However, these schemes are not valid for the outdoor situation where the delay spreads are significantly large and the channel is frequency selective fading. Therefore, in our paper, we propose CDMA with space-time block codin...

Providing Quality of Service(QoS) guarantees is important in the third generation (3G) and the fourth generation (4G) cellular networks. However, large scale fading and non-stationary small scale fading can cause severe QoS violations. To address this issue, we design QoS provisioning schemes, which are robust against time-varying large scale path loss, shadowing, non-stationary small scale fad...

We derive the capacity and optimal power allocation scheme for a multi-user fading broadcast channel in which minimum rates must be maintained for each user in all fading states, assuming perfect channel state information at the transmitter and at all receivers. We show that superposition coding can achieve the capacity of such channels and explicitly characterize the boundary of the capacity r...