Skip to main content
SpringerLink
Log in

A New Construction of Signature Waveforms for Multi-rate Multi-cell QS-CDMA Systems

  • Published:
Wireless Personal Communications Aims and scope Submit manuscript

Abstract

In this paper, we propose a new construction of signature waveform sets based on Generalized Loosely Synchronization (GLS) sets and different chip waveforms. The new signature sets are applied into the multi-rate multi-cell quasi-synchronous CDMA (QS-CDMA) system where each cell is assigned with a GLS set; different users in the same cell are assigned with different GLS sequences in the same GLS set; user’s different streams are assigned with the same GLS sequence but different chip waveforms. According to the properties of GLS sets, the inter-cell interference (ICI) and the multi-user interference (MUI) in the same cell can be reduced significantly. The interferences among different streams of the same user are handled by an optimal (or suboptimal) multi-stream detector(s), notice that the multi-stream detector mentioned here is also named as multi-user detector in other references. We compare the performance of the multi-rate multi-cell QS-CDMA system employing the proposed sets with that of multi-rate system employing well-known concatenated orthogonal/PN sets and that of single-rate system employing GLS sets. The results show that the multi-rate system employing the proposed sets can achieve significant interference reduction. Meanwhile the performance of multi-rate system is similar to that of single-rate system due to the inclusion of multi-user detection.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Pursley M.B. (1977) Performance evaluation for phase-coded spread-spectrum multiple-access communication-part I: system analysis. IEEE Transaction Communication, COM- 25(8): 795–799

    Article  MATH  Google Scholar 

  • Pursley M.B., Sarwate D.V. (1977) Performance evaluation for phase-coded spread-spectrum multiple-access communication-part II: code sequence analysis. IEEE Transaction Communication, COM- 25(8): 800–803

    Article  MATH  Google Scholar 

  • Tang X.H., Mow W.H. (2006) Design of spreading codes for quasi-synchronous cdma with intercell interference. IEEE Journal of Selected Areas Commmunication, 24(1): 84–93

    Article  Google Scholar 

  • Fan P.Z., Hao L. (2000) Generalized orthogonal sequences and their applications in synchronous CDMA systems. IEICE Transactions on Fundamentals E83-A(11): 1–16

    Google Scholar 

  • Fong M.H., Bhargava V.K., Wang Q. (1996) Concatenated orthogonal/PN spreading sequences and their application to cellular DS-CDMA system with integrated traffic. IEEE Journal of Selected Areas Commmunication, 15(3): 547–558

    Article  Google Scholar 

  • Amoroso F. (1980) The bandwidth of digital signals. IEEE Communication Magazine, 18: 13–24

    Article  Google Scholar 

  • Nguyen H.H., Shwedyk E. (2002) Bandwidth constrained signature waveforms and Walsh signal space receivers for synchronous CDMA systems. IEEE Transactions Commununication, 50: 1137–1149

    Article  Google Scholar 

  • Nguyen, H. H., & Shwedyk, E. (2000). Lower bound on the total squared correlation of the bandwidth constrained, time-limited signal sets. In Proceedings on IEEE International Symposium on Information Theory, Sorrento, Italy, p. 378.

  • Cheng, R. S., & Verdú, S. (1989). Optimal signal design for band-limited PAM synchronous multiple-access channels. In Proceedings on 23rd Conference Information Sciences and Systems (pp. 321–326). Baltimore, MD, March 1989.

  • Salmasi, A., & Gilhousen, K. S. (1991). On the system design aspects of code division multiple access(CDMA) applied to digital cellular and personal communications networks. In Proceedings on IEEE VTC (pp. 57–62). May 1991.

  • Fong, M. H., Wang, Q., & Bhargava, V. K. (1994). Concatenated orthogonal/PN codes for DS-CDMA systems in a multiuser and multipath fading environment. In Proceedings on IEEE Globecom (pp. 1642–1646). November 1994.

  • Proakis J.G. (1983) Digital communications. McGraw-Hill, New York

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. The Provincial Key Lab of Information Coding and Transmission, Institute of Mobile Communications, Southwest Jiaotong University, Chengdu, 610031, China

    Lifang Feng, Pingzhi Fan & Li Hao

  2. School of Engineering and Design, Brunel University, London, UB8 3PH, UK

    Kok-keong Loo

  3. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA

    Vahid Tarokh

Authors
  1. Lifang Feng
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Pingzhi Fan
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Li Hao
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Kok-keong Loo
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Vahid Tarokh
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Lifang Feng.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Feng, L., Fan, P., Hao, L. et al. A New Construction of Signature Waveforms for Multi-rate Multi-cell QS-CDMA Systems. Wireless Pers Commun 50, 493–507 (2009). https://doi.org/10.1007/s11277-008-9620-0

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11277-008-9620-0

Keywords

Search

Navigation