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: Efficient and Robust Detection of GFSK Signals under Dispersive Channel, Modulation Index, and Carrier Frequency Offset Conditions | EURASIP Journal on Applied Signal Processing 2005 16 2719-2729 2005 Hindawi Publishing Corporation Efficient and Robust Detection of GFSK Signals under Dispersive Channel Modulation Index and Carrier Frequency Offset Conditions Charles Tibenderana Communications Research Group School of Electronics and Computer Science University of Southampton SO17 1BJ UK Email ct02r@ Stephan Weiss Communications Research Group School of Electronics and Computer Science University of Southampton SO17 1BJ UK Email sw1@ Received 30 March 2004 Revised 5 October 2004 Gaussian frequency shift keying is the modulation scheme specified for Bluetooth. Signal adversities typical in Bluetooth networks include AWGN multipath propagation carrier frequency and modulation index offsets. In our effort to realise a robust but efficient Bluetooth receiver we adopt a high-performance matched-filter-based detector which is near optimal in AWGN but requires a prohibitively costly filter bank for processing of K bits worth of the received signal. However through filtering over a single bit period and performing phase propagation of intermediate results over successive single-bit stages we eliminate redundancy involved in providing the matched filter outputs and reduce its complexity by up to 90 for K 9 . The constant modulus signal characteristic and the potential for carrier frequency offsets make the constant modulus algorithm CMA suitable for channel equalisation and we demonstrate its effectiveness in this paper. We also introduce a stochastic gradient-based algorithm for carrier frequency offset correction and show that the relative rotation between successive intermediate filter outputs enables us to detect and correct offsets in modulation index. Keywords and phrases Gaussian frequency shift keying Bluetooth constant modulus algorithm carrier frequency offset correction modulation index offset correction. 1. INTRODUCTION Gaussian frequency shift keying GFSK is a .
