DocumentCode :
1132267
Title :
A residue number system based parallel communication scheme using orthogonal signaling. II. Multipath fading channels
Author :
Yang, Lie-Liang ; Hanzo, Lajos
Author_Institution :
Dept. of Electron. & Comput. Sci., Univ. of Southampton, UK
Volume :
51
Issue :
6
fYear :
2002
fDate :
11/1/2002 12:00:00 AM
Firstpage :
1547
Lastpage :
1559
Abstract :
For pt.I see ibid., vol.51, no.6, p.1534-46 (2002). A novel signaling scheme is presented, where a set of orthogonal signals is transmitted in parallel. The signals are selected according to the so-called residue number system (RNS). Hence the system is essentially a multiple code parallel communication scheme using high-modulation alphabets. It is demonstrated that the system performance can be substantially improved by exploiting a number of advantageous properties of the RNS arithmetic. The model treated in part I of this paper is extended here to account for the effects of the multipath Rayleigh fading channel when using noncoherent demodulation. Diversity reception techniques with equal gain combining (EGC) or selection combining (SC) are concerned. The related performance is evaluated for both nonredundant and redundant RNS-based orthogonal signaling. Interleaving and forward error-correction techniques are introduced for enhancing the system´s bit error rate (BER) performance. The concept of concatenated coding with a Reed-Solomon (RS) code as the outer code and a redundant RNS code as the inner code is presented, and the performance of the proposed concatenated code is evaluated. Expressions of the error probability for the above-mentioned scenarios are presented, and the associated BER performance is evaluated numerically with respect to specific system parameters. Without concatenated coding, coding gains up to 8.5 or 11 dB are achieved at a BER of 10-6 using the lowest reliability dropping technique of part I and one or two redundant moduli, respectively. The BER is substantially higher than that over the additive white Gaussian noise channel reported in part I. With the aid of RS coding, an additional 7.5-dB coding gain is achieved.
Keywords :
AWGN channels; Rayleigh channels; Reed-Solomon codes; code division multiple access; concatenated codes; digital radio; diversity reception; error statistics; forward error correction; interleaved codes; multipath channels; multiuser channels; residue number systems; telecommunication signalling; AWGN channel; BER performance; RNS based parallel communication; Reed-Solomon code; additive white Gaussian noise channel; bit error rate; code-division multiple access; coding gains; concatenated code; concatenated coding; diversity reception; equal gain combining; error probability; forward error-correction; high-modulation alphabets; inner code; interleaving; multipath Rayleigh fading channel; multipath fading channels; multiple code parallel communication; noncoherent demodulation; nonredundant RNS-based orthogonal signaling; orthogonal signaling; orthogonal signals; outer code; redundant RNS code; redundant RNS-based orthogonal signaling; redundant moduli; residue number system; selection combining; system parameters; system performance; Arithmetic; Bit error rate; Concatenated codes; Demodulation; Diversity reception; Error probability; Fading; Interleaved codes; Reed-Solomon codes; System performance;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2002.804849
Filename :
1175208
Link To Document :
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