Channel estimation assisted by postixed pseudo-noise sequences padded with null samples for mobile OFDM communications

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8 Scopus citations

Abstract

A channel estimation (CE) technique that uses a postfixed pseudo-random sequence padded with zeros is investigated in this paper to extend pseudo-random-postfix orthogonalfrequencydivision-multiplexing (PRP-OFDM) communications onto mobile applications. The proposed technique takes advantage of pseudonoise (PN) sequences periodically inserted after each OFDM block within the original guard interval (GI) in conventional zero-padded OFDM (ZP-OFDM) or within the original cyclic prefix (CP) in conventional CP-OFDM. This allows accurate estimation of the channel impulse response (CIR). In addition, the proposed technique takes advantage of the null samples padded after the PN sequences for reducing inter-symbol interference (ISI) occurring with the CEs and the information detection in the conventional PRP-OFDM. The proposed technique successfully applies either (1) a least-squares (LS) CE with assistance from decision-directed (DD) data or (2) approximate LS (ALS) CE method onto PRP-OFDM-like communications for the purpose of improving CE performance on rapid time-varying channels. Computer simulations show that the proposed technique can achieve lower error probabilities in mobile environments.

Original languageEnglish
Title of host publicationWCNC 2008 - IEEE Wireless Communications and Networking Conference, Conference Proceedings
Pages846-851
Number of pages6
StatePublished - 2008
EventIEEE Wireless Communications and Networking Conference, WCNC 2008 - Las Vegas, NV, United States
Duration: 31 Mar 20083 Apr 2008

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
ISSN (Print)1525-3511

Conference

ConferenceIEEE Wireless Communications and Networking Conference, WCNC 2008
Country/TerritoryUnited States
CityLas Vegas, NV
Period31/03/083/04/08

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