Performance comparison of spread ALOHA and CDMA wireless systems

Wireless multiple access technology has grown over several decades, with new protocols being developed. Spread ALOHA has become one of the advanced techniques promising several advantages over existing conventional and spread spectrum based wireless systems. With spread ALOHA the wireless system becomes simpler, operationally flexible, higher in bandwidth and may accommodate high number of users [Dennis et al., 1997]. In this paper the performance, in terms of throughput and time delay, of spread ALOHA system as compared with code-division-multiple-access (CDMA) is analysed and evaluated in the presence of noise and interference. Mathematical expressions are derived to estimate probability of error, throughput and time delay to compare both wireless systems.

[1]  James S. Lehnert,et al.  Packet throughput in slotted ALOHA DS/SSMA radio systems with random signature sequences , 1992, IEEE Trans. Commun..

[2]  James S. Lehnert,et al.  Bit-to-bit error dependence in slotted DS/SSMA packet systems with random signature sequences , 1989, IEEE Trans. Commun..

[3]  Bijan Jabbari,et al.  Spreading codes for direct sequence CDMA and wideband CDMA cellular networks , 1998, IEEE Commun. Mag..

[4]  E. H. Dinan.  Spreading Code for Direct Sequence CDMA and Wideband CDMA Cellular Networks , 1998 .

[5]  Michael B. Pursley,et al.  Error Probabilities for Binary Direct-Sequence Spread-Spectrum Communications with Random Signature Sequences , 1987, IEEE Trans. Commun..

[6]  Jack M. Holtzman,et al.  A simple, accurate method to calculate spread-spectrum multiple-access error probabilities , 1992, IEEE Trans. Commun..

[7]  H. Achi,et al.  Performance analysis for spread ALOHA wireless systems , 2003, International Conference on Communication Technology Proceedings, 2003. ICCT 2003..

[8]  James S. Lehnert,et al.  Performance comparison of a slotted ALOHA DS/SSMA network and a multichannel narrow-band slotted ALOHA network , 1998, IEEE Trans. Commun..

[9]  Robert K. Morrow.  Accurate CDMA BER calculations with low computational complexity , 1998, IEEE Trans. Commun..

[10]  Dipankar Raychaudhuri,et al.  Performance Analysis of Random Access Packet-Switched Code Division Multiple Access Systems , 1981, IEEE Trans. Commun..

[11]  M. Pursley,et al.  Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication - Part II: Code Sequence Analysis , 1977, IEEE Transactions on Communications.