Channel Independent Precoder for OFDM-Based Systems Over Fading Channels

Ortín, J. ; Garcia,P. (Universidad de Zaragoza) ; Gutiérrez,F. (Universidad de Zaragoza) ; Valdovinos,A. (Universidad de Zaragoza)

Resumen: In this paper we propose an independent channel precoder for orthogonal frequency division multiplexing (OFDM) systems over fading channels. The design of the precoder is based on the information redistribution of the input modulated symbols among the output precoded symbols. The proposed precoder decreases the variance of the instantaneous noise power at the receiver produced by the channel variability. The employment of an interleaver together with a precoding matrix whose size does not depend on the number of data carriers in an OFDM symbol allows different configurations of time-frequency diversity which can be easily adapted to the channel conditions. The precoder is evaluated with a modified Zero Forcing (ZF) equalizer whose maximum gain is constrained by means of a clipping factor. Thus, the clipping factor limits the noise power transfer in the receiver deprecoding block in low SNR conditions.

Idioma: Inglés

DOI: 10.1109/TBC.2009.2033403

Año: 2009

Publicado en: IEEE TRANSACTIONS ON BROADCASTING 55, 4 (2009), 818-825
ISSN: 0018-9316

Factor impacto JCR: 2.242 (2009)

Categ. JCR: TELECOMMUNICATIONS rank: 7 / 74 = 0.095 (2009) - Q1 - T1
Categ. JCR: ENGINEERING, ELECTRICAL & ELECTRONIC rank: 33 / 244 = 0.135 (2009) - Q1 - T1

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Teoría Señal y Comunicac. (Dpto. Ingeniería Electrón.Com.)
Área (Departamento): Área Ingeniería Telemática (Dpto. Ingeniería Electrón.Com.)