1. INTRODUCTION Due to the recent popularity of mobile phones and broadband wireless LANs, broadband wireless systems employing Orthogonal Frequency Division Multiplexing (OFDM) signals were introduced to combat the effects of multi-path fading in indoor wireless LAN systems. Moreover, Multiple Input Multiple Output (MIMO) is incorporated into these broadband wireless systems using OFDM signals...

High-speed wireless communication systems have attracted much attention in recent years. To achieve a high-speed wireless communication system that utilizes an ultra-wide-frequency band, a broadband antenna is required. However, it is difficult to obtain an antenna that has uniform characteristics in a broad frequency band. Moreover, propagation characteristics are distorted in a multi-path env...

We investigate the performance of uncoded uplink transmissions in a broadband code division multiple access (CDMA) system using a tapped delay line (TDL) antenna array. First, the weights of a TDL antenna array are derived for broadband CDMA. Using these weights, we perform simulations to demonstration how TDL antenna arrays can help reduce multi-access interference (MAI), allow the use of spre...

In this paper, an UWB-MIMO antenna with frequency selective surface (FSS) decoupling structure is proposed. To realize antenna system miniaturization and integration, silicon material is applied as substrate. The proposed antenna becomes a very compact construction with dimension of 38.2 × 26.6 × 0.4 mm. The proposed broadband FSS unit consists of four split rectangles and one I-shaped strip. T...

Broadband wireless channels, where high data rates are transmitted, are extremely dispersive in nature. A fundamental challenge in the design of equalizers for the broadband case lies in reducing complexity. Broadband finite impulse response (FIR) beamformers employ a space-time antenna array which reduces the multipath delay spread to narrowband levels. Adaptive frequency-domain equalizers tha...

Patch antenna with double notches and triangular tapered feeding line has been investigated. It is observed that broadband matched double-notched patch antenna is suitable for tri-band operations from simulation and experimental results. It shows a measured return loss well below –10 dB in all three-frequency bands of operation. It has also been observed that the double notched conventional rec...