Dynamic sub-channel allocation with adaptive beamforming for broadband OFDM wireless systems

Ya Han Pan, Khaled Ben Letaief, Zhigang Cao

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

Orthogonal frequency division multiplexing (OFDM) has been widely regarded as an effective modulation technique for mitigating the effectso f ISI in a frequency selective fading channel and for providing reliable high data rate transmission over wireless links. Adaptivea ntenna arrays at the base and mobile stations can achieve further increases in system's capacity and bandwidth efficiency, as well as in QoS improvement in conventional OFDM systems. The conventional adaptive antenna arrays based OFDM systems always use the sub-carriers characterized by the first largest eigenvalues to transmit the OFDM block symbols. In this paper and in contrast to previous work, we propose dynamic sub-channel allocation with adaptive beamforming for broadband OFDM wireless transmission systems. The proposed system adaptively selects the eigenvectors associated with the relatively large sub-channel eigenvalues to generate the beamforming weights at the mobile and base stations and then dynamically assigns the corresponding best sub-channels to transmit the OFDM block symbols. It is shown by simulation that, without adding much complexity, the proposed system can achieve a better performance than an adaptive antenna arrays based OFDM system without dynamic sub-channel allocation over multipath fading channels. Simulation results also reveal that the proposed system is not too sensitive to channel estimation errors.

Original languageEnglish
Pages711-715
Number of pages5
Publication statusPublished - 1 Dec 2002
EventGLOBECOM'02 - IEEE Global Telecommunications Conference - Taipei, Taiwan, Province of China
Duration: 17 Nov 200221 Nov 2002

Other

OtherGLOBECOM'02 - IEEE Global Telecommunications Conference
CountryTaiwan, Province of China
CityTaipei
Period17/11/0221/11/02

    Fingerprint

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

Cite this

Pan, Y. H., Ben Letaief, K., & Cao, Z. (2002). Dynamic sub-channel allocation with adaptive beamforming for broadband OFDM wireless systems. 711-715. Paper presented at GLOBECOM'02 - IEEE Global Telecommunications Conference, Taipei, Taiwan, Province of China.