Performance of low-complexity code acquisition for direct-sequence spread spectrum systems
نویسنده
چکیده
The authors consider a low-complexity technique for direct-sequence spread spectrum code acquisition. They present performance analysis in Rayleigh fading channels, and with carrier frequency offset in the receiver. They derive analytical expressions for acquisition probabilities, and use them to determine the mean and variance of the acquisition time. It is shown that acceptable performance can be achieved with significant reduction in hardware requirements, compared to conventional detectors. Simulations confirm the analytical results. Performance comparisons are presented under a range of scenarios including significant frequency offsets and fading channels.
منابع مشابه
Acquisition of Direct Sequence Spread Spectrum Acoustic Communication Signals
Acquisition of the code timing in DS/SS systems is addressed for time-varying frequency-selective underwater acoustic channels. Acquisition algorithm based on adaptive channel estimation and fitlering is proposed. The algorithm employs feedback of pre-cursor and post-cursor inter-chip interference to provide a channel estimate from which the code timing is acquired. The channel estimate is also...
متن کاملLow Complexity Long PN Code Acquisition Scheme for Spread Spectrum Systems
In this paper, a low complexity long pseudo noise (PN) code acquisition scheme is proposed for spread spectrum systems including global positioning system (GPS) and code division multiple access (CDMA) system. By using a phaseshift-network, the proposed scheme has less complexity than the conventional dual correlating sequential estimation scheme. From the analytic and numerical results, it is ...
متن کاملA Novel Multi-user Detection Approach on Fluctuations of Autocorrelation Estimators in Non-Cooperative Communication
Recently, blind multi-user detection has become an important topic in code division multiple access (CDMA) systems. Direct-Sequence Spread Spectrum (DSSS) signals are well-known due to their low probability of detection, and secure communication. In this article, the problem of blind multi-user detection is studied in variable processing gain direct-sequence code division multiple access (VPG D...
متن کاملMathematical modeling and performance analysis for a two-stage acquisition scheme for direct-sequence spread-spectrum CDMA
The problem of acquisition of synchronism is considered for direct-sequence spread-spectrum (DS/SS) code-division multiple-access (CDMA) systems. For large systems with large timing uncertainties, it has been shown recently that acquisition in the presence of multiple-access interference may impose a significant limitation on capacity. This leads us to consider a system in which timing uncertai...
متن کاملA Low Complexity Ds/cdma Acquisition Technique for Large Frequency Offsets
This paper discusses a code acquisition technique, for use in spread-spectrum communication system with large frequency offsets, where the frequency offset is similar to the symbol rate. This is the situation typically in satellite communications systems. The technique uses a very efficient method of performing the correlation where the frequency and time space can be searched with very little ...
متن کامل