TITLE:
A Receiver Structure for Frequency-Flat Time-Varying Rayleigh Channels and Performance Analysis
AUTHORS:
Xiaofei Shao, Harry Leib
KEYWORDS:
Receiver Structure, Time-Varying Rayleigh Channels, Filter Banks, Fast Haar Transform
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.9 No.10,
September
28,
2016
ABSTRACT: This paper proposes a wavelet based
receiver structure for frequency-flat time-varying Rayleigh channels,
consisting of a receiver front-end followed by a Maximum A-Posteriori (MAP)
detector. Discretization of the received continuous time signal using filter
banks is an essential stage in the front-end part, where the Fast Haar
Transform (FHT) is used to reduce complexity. Analysis of our receiver over
slow-fading channels shows that it is optimal for certain modulation schemes.
By comparison with literature, it is shown that over such channels our receiver
can achieve optimal performance for Time-Orthogonal modulation. Computed and
Monte-Carlo simulated performance results over fast time-varying Rayleigh
fading channels show that with Minimum Shift Keying (MSK), our receiver using
four basis functions (filters) lowers the error floor by more than one order of
magnitude with respect to other techniques of comparable complexity. Orthogonal
Frequency Shift Keying (FSK) can achieve the same performance as Time-Orthogonal
modulation for the slow-fading case, but suffers some degradation over
fast-fading channels where it exhibits an error floor. Compared to MSK,
however, Orthogonal FSK provides better performance.