Fu Hongyi

Email Address
cwcfuhy@nus.edu.sg


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1999 - 20004
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Now showing 1 - 4 of 4
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    Generation of two correlated rayleigh fading signals with arbitrary powers
    (1999) Fang, L.; Bi, G.; Fu, H.; CENTRE FOR WIRELESS COMMUNICATIONS
    For diversity reception with correlated Rayleigh fading signals, it is necessary to conduct computer simulation to investigate the impact of correlation and power distribution of the received signals on the system performance. This paper presents a simple method for generation of correlated Rayleigh fading signals for computer simulation. Based on a transformation technique, two uncorrelated Rayleigh fading signals can be converted into two correlated Rayleigh fading signals with desired correlation coefficient and power distribution.
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    Performance of multi-beam CDMA-based LEO satellite systems in a rice-lognormal channel
    (1999-04) Fu, H.; Bi, G.; Arichandran, K.; CENTRE FOR WIRELESS COMMUNICATIONS
    The performance of multi-beam code-division multiple-access (CDMA)-based low earth orbit (LEO) systems with convolutional coding and soft decision Viterbi decoding is analyzed. The multiple access interference due to all visible interferers of the given satellite is taken into account. The results show that the interference coming from the users located outside the footprint but still seen by the given satellite has a nontrivial effect on the system capacity. The multiple access interference, though, can be reduced by increasing the elevation restraint of each satellite footprint. Estimates on this reduction are given.
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    Capacity enhancement with adaptive arrays in a CDMA-based LEO satellite system
    (2000) Fu, Hongyi; Bi, Guoan; Arichandran, K.; CENTRE FOR WIRELESS COMMUNICATIONS
    The capacity enhancement achieved by adaptive antenna arrays at the base station in a CDMA-based multi-beam LEO system is investigated. The system outage probability is evaluated based on a comprehensive analysis of multiple access interference which includes the effects of power control algorithm, the channel fading and shadowing, and the antenna characteristics. Because the statistically optimal beams can be formed by adaptive arrays, the severe multiple access interference in satellite CDMA can be significantly suppressed. The numerical results demonstrate that there is a substantial increase in the uplink capacity by employing adaptive arrays at the base station.
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    Publication
    Joint channel and frequency offset estimation in CDMA systems
    (2000) Fu, H.; Abed-Meraim, K.; CENTRE FOR WIRELESS COMMUNICATIONS
    The problem of frequency offset and channel estimation is essential for multiuser detectors in a DSCDMA system. An efficient algorithm for joint estimation of these parameters without using training sequences is proposed. The approach exploits ESPRIT algorithm by collecting two samples within each chip duration and constructing an approximate shift invariance structure. The high-resolution and noise-robust frequency offset estimation can therefore be achieved. Although the proposed algorithm is suboptimal relative to the maximum likelihood estimators, it provides the closed-form solutions and much less complexity in computation.