In this paper, the effect of imperfect channel estimation (ICE) on maximal-ratio combining (MRC) and equal-gain combining (EGC) in receive antenna diversity systems with M-level quadrature amplitude modulation (MQAM) are examined. The channel is assumed to be spatiallyindependent frequency-flat with Ricean fading and AWGN. Average BERs and outage probability of MRC and EGC antenna diversity com...

The performance of a cooperative diversity with selection combining is analyzed in Rayleigh fading channels. The effect of limited power at the relay node is also presented. Our results show that when the average signal-to-noise ratio (SNR) of each branch is identical, the single relay cooperative diversity with selection combining provides 13.5 dB power gain over the non-cooperative system at ...

In this paper, closed-form expressions for the capacities per unit bandwidth for generalized Rician fading channels are derived for power and rate adaptation, constant transmit power, channel inversion with fixed rate, and truncated channel inversion adaptation policies. The closed-form solutions are derived for the single antenna reception (without diversity combining) and maximal-ratio combin...

This paper presents closed-form expressions for the ergodic channel capacity of SIMO (single-input and multiple output) wireless systems operating in a Nakagami-m fading channel. As the performance of SIMO channel is closely related to the diversity combining techniques, we present closed-form expressions for the capacity of maximal ratio combining (MRC), equal gain combining (EGC), selection c...

In this paper, we present a synchronous multicarrier code division multiple access scheme for the uplink. We apply interleaved and block spreading schemes for Rayleigh and Rice fading channels. Enhancing diversity in the uplink is feasible by applying transmit diversity schemes. Therefore, we compare cyclic delay diversity (CDD) with the Alamouti scheme. Increasing the number of transmit antenn...

Multiple Classifier Systems (MCSs) have been widely used in the area of pattern recognition due to the difficult task that is to find a single classifier that has a good performance on a great variety of problems. Studies have shown that MCSs generate a large quantity of classifiers and that those classifiers have redundancy between each other. Various methods proposed to decrease the number of...

Diversity combining methods for convolutional coded and soft-decision Viterbi decoded channels in mobile satellite communication systems are evaluated and it is clarified that the pre-Viterbi-decoding maximal ratio combining shows better performance than other methods in Rician fading channels by computer simulation. A novel practical technique for the maximal ratio combining is proposed, in wh...

A Wireless Ad-hoc network is an autonomous and self-organizing network without any centralized controller. Cooperative communication is a technique used to increase the reliability and the quality of service (QoS), coverage area range. Space time coding and spatial diversity schemes enhances the performance of the wireless networks. Such networks can be used in military communications and have ...

Fading problem is a major impairment of the wireless communication channel. In this paper we considers different diversity techniques to mitigate the fading problem in wireless channel for DS CDMA (Direct sequence Code Division Multiple Access) system. Diversity is an effective method for increasing the received signal-to-noise ratio of a wireless communication system in a flat Rayleigh fading ...

Due to the time-varying nature of the wireless channel and presence of limited resources for the signal transmission, which faces various detrimental effects such as path-loss, delay spread, Doppler spread, shadowing and interference make it very difficult to achieve sufficient data rates. To combat the effect of multi-path fading in the wireless communication system, the diversity combining me...