Multistage block-spreading for impulse radio multiple access through ISI channels

Liuqing Yang, Georgios B. Giannakis

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Transmitting digital information using ultra-short pulses, impulse radio (IR) has received increasing interest for multiple access (MA). When IRMA systems have to operate in dense multipath environments, the multiple user interference (MUI) and intersymbol interference (ISI) induced, adversely affect system capacity and performance. Analog IRMA utilizes pulse position modulation (PPM) and random time-hopping codes to mitigate ISI and suppress MUI statistically. We develop an all-digital IRMA scheme that relies on multistage block-spreading (MS-BS), and judiciously designed transceiver pairs to eliminate MUI deterministically, and regardless of ISI multipath effects. Our proposed MS-BS-IRMA system can accommodate a large number of users and is capable of providing different users with variable transmission rates, which is important for multimedia applications. Unlike conventional IRMA systems, MS-BS-IRMA exhibits no degradation in bit-error rate performance, as the number of users increases.

Original languageEnglish (US)
Pages (from-to)1767-1777
Number of pages11
JournalIEEE Journal on Selected Areas in Communications
Issue number9
StatePublished - Dec 2002

Bibliographical note

Funding Information:
Manuscript received January 10, 2002; revised July 30, 2002. This work was supported in part by the ARL/CTA under Grant DAAD19-01-2-011, and in part by a DARPA subcontract from General Dynamics. This paper was presented in part at the IEEE Conference on Ultra-Wideband Systems and Technologies, Baltimore, MD, May 20–23, 2002.


  • Block-spreading (BS)
  • Impulse radio (IR)
  • Multipath fading channels
  • Multiple access (MA)
  • Time-hopping (TH)
  • Ultra-wideband (UWB) systems
  • Wireless cellular systems

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