Assistant Professor, Dept. of ECE, JNNCE, Shivamogga, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – CDMA is a type of channel access method in which users using the same channel will use the same frequency band and also can access the channel at the same time. Using CDMA, mo...

The next generation wireless communications systems require higher data rates transmission in order to meet the higher demand of quality services. Research in wireless digital communications techniques have been expending very rapidly in the last few decades, resulting more reliable wireless communication systems that operate at higher spectral efficiency. Since there have been an increased in ...

Code Division Multiple Access (CDMA) is a spread spectrum technique that uses neither frequency channels nor time slots. With CDMA, the narrow band message (typically digitized voice data) is multiplied by a large bandwidth signal that is a pseudo random noise code (PN code). All users in a CDMA system use the same frequency band and transmit simultaneously. The transmitted signal is recovered ...

MC-CDMA (MultiCarrier Code Division Multiple Access), currently regarded as a promising multiple access scheme for broadband communications, is known to combine the advantages of an OFDM-based (Orthogonal Frequency Division Multiplexing), CP-assisted (Cyclic Prefix) block transmission with those of CDMA systems. Recently, it was recognized that DS-CDMA (Direct Sequence) implementations can also...

This paper discusses the application of different algorithm transformation techniques in Code Division Multiple Access receivers (CDMA). This is achieved by looking at some of the computational blocks that constitute the CDMA receivers. We focus on the Look-Ahead, Relaxed Look-ahead and Strength Reduction algorithm transformation techniques and demonstrate how CDMA receivers could benefit when ...

The crop model data assimilation approach has been acknowledged as an effective tool for monitoring growth and estimating yield. However, the choice of assimilated variables mismatch in scale between remotely sensed observations model-simulated state have various effects on performance yield estimation. This study aims to examine accuracy estimation through joint leaf area index (LAI) soil mois...

In this paper, the near-far resistance of the minimum mean square error (MMSE) detector is derived for the multicarrier direct sequence code division multiple access (MC-DS-CDMA) communication systems. It is shown that MC-DS-CDMA has better performance on near-far resistance than that of DS-CDMA.

This report examines optical CDMA communication techniques with optical orthogonal codes. Simulations that show the desired properties of theses codes and their use in optical CDMA are reported. Based on the simulations, we investigate the properties of optical CDMA. Proba bility of error is also evaluated.

it is shown in [1] that the optimal downlink radio resource allocation for non-realtime traffic in cellular cdma/tdma networks can be mapped to a multi-dimensional multiple-choice knapsack problem (mmkp) which is np-hard. in this correspondence we propose a heuristic algorithm with polynomial time complexity for this problem. numerical results indicate significant computational performance impr...