Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Comparison of Antenna Array Systems Using OFDM for Software Radio via the SIBIC Model | EURASIP Journal on Applied Signal Processing 2005 16 2730-2738 2005 Hindawi Publishing Corporation Comparison of Antenna Array Systems Using OFDM for Software Radio via the SIBIC Model Khoi D. Le Department of Electrical Engineering University of Nebraska-Lincoln Lincoln NE 68588 USA School of Electrical and Computer Engineering University of Oklahoma Norman OK 73019 USA Email khoi@ Michael W. Hoffman Department of Electrical Engineering University of Nebraska-Lincoln Lincoln NE 68588 USA Email mhoffman1@ Robert D. Palmer School of Meteorology University of Oklahoma Norman OK 73019 USA Email rpalmer@ Received 31 January 2004 Revised 28 October 2004 This paper investigates the performance of two candidates for software radio WLAN reconfigurable OFDM modulation and antenna diversity in an indoor environment. The scenario considered is a 20 m X 10m X 3m room with two base units and one mobile unit. The two base units use omnidirectional antennas to transmit and the mobile unit uses either a single antenna with equalizer a fixed beamformer with equalizer or an adaptive beamformer with equalizer to receive. The modulation constellation of the data is QPSK and 16-QAM. The response of the channel at the mobile unit is simulated using a three-dimensional indoor WLAN propagation model that generates multipath components with realistic spatial and temporal correlation. An underlying assumption of the scenario is that existing antenna hardware is available and could be exploited if software processing resources are allocated. The results of the simulations indicate that schemes using more resources outperform simpler schemes in most cases. This implies that desired user performance could be used to dynamically assign software processing resources to the demands of a particular indoor WLAN channel if such resources are available. Keywords and phrases OFDM modulation multipath channel indoor radio stochastic channel model wireless LAN. 1. INTRODUCTION .
