Recently, a digital communication receiver, called a third-generation receiver, has been developed. This receiver takes samples of the direct-sequence spread signal at a nonzero intermediate frequency (IF) instead of the zero IF (baseband), and quantizes the samples by employing a 1-b analog-to-digital (A/D) converter at the receiver front end. These 1-b samples are digitally processed for pseu...

A space-time processing scheme is proposed for TDMA based cellular/PCS communications that cancels co-channel interference while simultaneously equalizing the desired signal. This is achieved through processing of a training signal designed from a PN code. At the receiver, the symbol waveform is built up above the noise and interference through correlation with a sampled waveform designed to ex...

Different pseudo-random or pseudo-noise (PN) as well as orthogonal sequences that can be used as spreading codes for code division multiple access (CDMA) cellular networks or can be used for encrypting speech signals to reduce the residual intelligence are investigated. We briefly review the theoretical background for direct sequence CDMA systems and describe the main characteristics of the max...

Sangjo Park et al. 13 We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depre...

| In order to successfully demodulate a digitally modulated signal, the receiver must rst synchronize its os-cillators and clocks to the received signal. If direct-sequence spread-spectrum modulation is used, then it is also necessary to synchronize to the code sequence that was used to produce the spectral spreading. Methods used to achieve coarse synchronization to the code sequence, also cal...

Direct GPS P (Y)-code acquisition is necessary when GPS C/A code signal is denied. Since the acquisition process is a two-dimensional search in time domain and frequency domain, a successful correlator design with a local P-code generator as reference is very important. As a new programmable technology, FPGA is a good choice for digital system prototyping and design. Especially Xilinx Virtex ch...

Code division multiple access (CDMA) uses spread spectrum technology where each user is assigned a unique code and allows multiple users to be multiplexed over the same physical channel. The spread spectrum is used in the commercial applications such as mobile handsets, internet, and satellite applications. KeywordsSSMA, DDS, DS-CDMA, PN code.

Low-area matched filter and correlator designs are explored in this thesis, for ADC resolutions of 1and 2-bits. Correlators are used extensively in spread-spectrum communication technologies, where they serve as a means of detecting a known pseudo-random sequence (PN code). The correlator designs presented here are intended for direct-sequence spread spectrum (DSSS) radio, where the data to be ...

This paper is concerned with the acquisition of structures involving Proper Names (PN) and Kinship Terms (KT). Building on ideas from Radford (1990) and Pine & Martindale (1996), and based on data on the acquisition of structures involving PNs and KTs in Modern Greek (MG), I will argue that the acquisition of the functional projection DP does not take place in an all or nothing fashion, but rat...

In delay eyeblink conditioning (EBC) a neutral conditioned stimulus (CS; tone) is repeatedly paired with a mildly aversive unconditioned stimulus (US; periorbital electrical shock). Over training, subjects learn to produce an anticipatory eyeblink conditioned response (CR) during the CS, prior to US onset. While cerebellar synaptic plasticity is necessary for successful EBC, the amygdala is pro...