For Orthogonal Frequency Division Multiple Access (OFDMA) system module, there is a need for an efficient alterable point FFT processor. Therefore, it is meaningful to design a FFT processor for which input data points could be alterable. In this paper the variable input FFT processor is designed to meet the requirements of OFDMA system. For this, in this paper we select the 2D Fourier transfor...

The signal structure performance of a direct sequence spread spectrum (DSSS) code division multiple access (CDMA) frequency division multiple access (FDMA) pseudolite indoor communication and localization (geolocation) system is presented and discussed in this paper. The signal structure of a DSSSFCDMA (or C-CDMA) pseudolite indoor geolocation system appears to elegantly solve the near-far prob...

Personal Communications Services (PCS) require low-power radio technologies. One such transceiver architecture employing frequency-hopped spread spectrum techniques is described. Low power and robustness are two keys to a wireless personal communications device. A frequency-hopped code-division multiple access (CDMA) scheme is chosen over other multiple access methods because it provides an inh...

Currently we see a multitude of emerging ideas that aim to provide information and higher level services for mobile users Starting with simple voice communications and information browsing they reach towards multi component services like personal travel assistance comprising wireless communication information technology and navigation Provocatively we could argue that the latter ones are likely...

0163-6804/98/$10.00 © 1998 IEEE avelength-division multiplexing (WDM) as a system concept goes back to the early 1970s. At that time, however, it usually only implied the use of two wavelengths, generally one in each of the 1300 nm and 1550 nm windows to enable full duplex transmission. Furthermore, the development of point-to-point links was the main thrust of WDM research throughout the 1970s...

A crucial open problem inS large-scale quantum networks is how to efficiently transmit quantum data among many pairs of users via a common data-transmission medium. We propose a solution by developing a quantum code division multiple access (q-CDMA) approach in which quantum information is chaotically encoded to spread its spectral content, and then decoded via chaos synchronization to separate...

In rate division multiple access (RDMA), transmission interval between pulses of each user, also referred as user period, is made different so that pulses transmitted by other users can be interleaved within that interval. To reduce collision probability in such scheme, each node requires to generate relative prime from which the user period is computed. We present a novel scheme to generate un...

Long-Term Evolution (LTE) systems will employ single carrier frequency division multiple access (SC-FDMA) for the uplink. Similar to the Orthogonal frequency-division multiple access (OFDMA) technology, SC-FDMA is sensitive to frequency offsets leading to intercarrier interference (ICI). In this paper, we propose a Kalman filter-based approach in order to mitigate ICI under high Doppler spread ...

In next generation wireless network, significantly higher rate data services of close to 1Gpbs are expected. The wireless channels for such a broadband data transmission become severe frequency-selective. Frequency-domain equalisation (FDE) technique may play an important role for broadband data transmission using multi-carrier (MC)and direct-sequence code division multiple access (DS-CDMA). Th...

The optical code division multiple access (optical CDMA) systems is a versatile multiple access technique as compared to time division multiple access (TDMA) and wavelength division multiple access (WDMA). In optical CDMA, the users are assigned unique codes whereas the WDMA and TDMA systems users are assigned different wavelengths or time slots so as to distinguish the data recovered at the re...