This is a non-refereed presentation that examines the use of comb filters in GNSS receivers, reviewing some of the discussion recently presented in [1]. Because the GPS L1 C/A code signal has a spectrum made up of lines regularly spaced at 1kHz intervals, the use of comb filters, which have regularly spaced passor stop-bands, would on the face of it seem a logical step. It is shown, however, th...

Source code repositories are designed to store a huge amount of source code. They also collect indirectly information useful to analyze the development process. Usually, the last set of data is not used at all due to the lack of specialized tools to collect and analyze such data. This paper presents the early stages of a tool designed to perform acquisition and analysis of data stored in source...

Abstract—Code synchronization is a critical step for fast and reliable code search in directsequence spread-spectrum (DS-SS) system. In this paper, we propose a novel differentially coherent (DC) detection scheme for rapid code acquisition over a fast Rayleigh fading mobile radio channel with frequency offset, and compare the performance with the conventional I-Q noncoherent detection scheme. N...

Powerful advantages of programmable logic controller (PLC) dominate process industries. Scan time PLC increases with the number inputs, rungs added in ladder diagram (LD). Researchers have identified and proved that field gate array (FPGA) is more suitable than for high speed applications. executes instructions represented through LD. programmers are not familiar FPGA programming. But, does sup...

This paper presents two different code acquisition schemes for sectorized multi-antenna CDMA systems in downlink mode. The so called ”separated code optimization” (SCO) decomposes a two dimensional spreading code into its time and space component and treats each part separately. The SCO maximizes the signal to interference and noise ratio at each receiver. In contrast, the ”joint code optimizat...

Mobile code computation is a new paradigm for structuring distributed systems. Mobile programs migrate from remote sites to a host, and interact with the resources and facilities local to that host. This new mode of distributed computation promises great opportunities for electronic commerce, mobile computing, and information harvesting. There has been a general consensus that security is the k...

The long PN code in a Binary Offset Carrier (BOC) modulated signal has a higher rate than the GPS C/A code, which makes the acquisition process in the new global navigation satellite system (GNSS) much more complex. To achieve a fast acquisition of the GNSS signal with a reduced number of correlators and low computational complexity, a two-stage deterministic compressed (DS) GNSS acquisition te...

In this paper, using the locally optimum (LO) test statistic, a joint decision rule of two correct cells is derived for nonselective Rayleigh fading channels. Then, we propose a new acquisition scheme based on the joint decision rule. The mean acquisition time performance of the proposed acquisition scheme is analyzed and compared with that of a conventional acquisition scheme in which only one...