A decision-directed spread-spectrum RAKE receiver for fast-fading mobile channels

Author

Povey, Gordon J R ; Grant, Peter M. ; Pringle, R.D.

Author_Institution

Dept. of Electr. Eng., Edinburgh Univ., UK

Volume

45

Issue

3

fYear

1996

fDate

8/1/1996 12:00:00 AM

Firstpage

491

Lastpage

502

Abstract

The operation of a decision-directed RAKE receiver is described that has the advantage of not requiring any bandwidth overhead for training bits. The performance is illustrated using bit error rate (BER) graphs and burst error length cumulative distribution functions (CDFs) obtained from Monte Carlo simulations. The receiver simulated operates over a fast-fading (100-Hz Doppler) mobile channel at a bit rate of 4.8 kbit/s using a 900-MHz carrier. It is shown that the receiver is not greatly affected by error propagation. However, the incurred lag on the channel impulse response estimate is the major limitation mechanism, and the resulting irreducible BER is quantified for various numbers of taps in our receiver design. The RAKE receiver performance is examined and compared using maximal-ratio, equal-gain, and differential phase combining techniques

Keywords

error statistics; fading; land mobile radio; radio receivers; spread spectrum communication; transient analysis; transient response; 100 Hz; 4.8 kbit/s; 900 MHz; BER graphs; Monte Carlo simulations; RAKE receiver; UHF; bit error rate; bit rate; burst error length; carrier; channel impulse response estimate; cumulative distribution functions; decision-directed spread-spectrum; differential phase combining; equal-gain combining; error propagation; fast-fading mobile channels; irreducible BER; maximal-ratio combining; receiver design; receiver performance; taps; Bit error rate; Bit rate; Diversity reception; Fading; Multiaccess communication; Multipath channels; RAKE receivers; RF signals; Spread spectrum communication; Vehicles;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.533765

Filename

533765