The bit error rate (BER) performance of a two-dimensional (2-D) RAKE receiver, in combination with transmit diversity on the downlink of a wide-band CDMA (W-CDMA) system, is presented. The analyses assume correlated fading between receive antenna array elements, and an arbitrary number of independent but nonidentical resolvable multipaths combined by the RAKE receiver in the general Nakagami-m ...

In this paper, a block code technique is proposed to increase the data rate and to reduce the symbol error rate for the wireless communication. The designed space time block code (STBC) is compared with golden code 2x2, silver code 2x2. STBC is used to realize the diversity gain and provide the remarkable performance in wireless communication systems using MIMO. STBC is based on improved Quasi ...

In a cooperative diversity network users cooperate on transmitting each others’ messages; to some extend nodes therefore collectively act as an antenna array. In this paper we derive upper and lower bounds for the information theoretic capacity of 4 node ad-hoc networks with two transmitters and two receivers using cooperative diversity. For comparison, in an N user channel with M antennas at t...

In this paper, we study the transport capacity in packet-meters per slot per node and the space time spectrum efficiency in bit-meters per Hz per second per square meter for large wireless CDMA ad hoc networks, considering optimization of MAC and routing protocols and fixed physical layer. The node density and processing gain tend to infinity with their ratio kept a constant. The limiting netwo...

The long-term performance of different selection strategies was evaluated via simulation using the example of a local cattle breed, German Angler cattle. Different optimum contribution selection (OCS) approaches to maximize genetic gain were compared to a reference scenario without selection and truncation selection. The kinships and migrant contribution (MC) were estimated from genomic data. T...

An experiment has been conducted to evaluate micro scale site diversity (MSD) at Ahmedabad, a tropical site in India. Rain data is collected by a linear array of tipping bucket rain gauges during 2007 and 2008 monsoon periods. Spatial variation of rain fall has been studied with the help of joint probability and correlation coefficients derived for the collected data. The results support the ex...

Antenna diversity is an effective technique for improving the transmission performance in a multi-path fading channel. Recently, transmit diversity has been attracting much attention since it can alleviate the complexity problem of the mobile terminals. Joint transmit diversity/receive diversity achieves a much improved transmission performance. In this paper, we propose a new space-time block ...

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...

In this paper, we analyze the asymptotic performance of multiple antenna channels where the transmitter has either perfect or finite bit channel state information. Using the diversitymultiplexing tradeoff to characterize the system performance, we demonstrate that channel feedback can fundamentally change the system behavior. Even one-bit of information can increase the diversity order of the s...

In this work, spatial diversity techniques in the area of multiple-input multiple-output (MIMO) diffusion-based molecular communications (DBMC) are investigated. For transmitterside spatial coding, Alamouti-type coding and repetition MIMO coding are proposed and analyzed. At the receiver-side, selection diversity, equal-gain combining, and maximum-ratio combining are studied as combining strate...