Direct-conversion receiver for HiperLAN2

Jian Gu

doi:10.1117/12.447392

2 November 2001 Direct-conversion receiver for HiperLAN2

Jian Gu

Proceedings Volume 4529, Enabling Technologies for 3G and Beyond; (2001) https://doi.org/10.1117/12.447392
Event: ITCom 2001: International Symposium on the Convergence of IT and Communications, 2001, Denver, CO, United States

Abstract

A direct conversion receiver is presented for HiperLAN2 system that uses Orthogonal Frequency Division Multiplexing (OFDM) as its modulation scheme with data rate up to 54 Mbits/second. The direct conversion scheme converts the RF signal directly into a complex low-pass equivalent signal represented by in- phase (I) and quadrature (Q) components or so called I-Q base- band signal without any Intermediate Frequency (IF) stages and expensive Surface-Acoustic-Wave (SAW) filters. However, for a direct conversion receiver there are many key issues to be solved. One of the most important issues is so-called I-Q imbalance caused by the mismatch between I channel and Q channel of the quadrature demodulator. The I-Q imbalance may include gain and group delay difference between the I channel and the Q channel at any frequency within the low-pass signal bandwidth. With the patent-pending IQ-Balancing^TM technology and other proprietary technologies of 4D Connect, inc., the adverse effects of I-Q imbalance on the receiver performance can be removed. Fixed-point simulation results for sensitivity performance and interference performance are presented. Performance comparisons when severe I-Q imbalance is present are also given.

Citation Download Citation

Jian Gu "Direct-conversion receiver for HiperLAN2", Proc. SPIE 4529, Enabling Technologies for 3G and Beyond, (2 November 2001); https://doi.org/10.1117/12.447392

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