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Efficient and Robust Detection of GFSK Signals under Dispersive Channel, Modulation Index Offset, and Carrier Frequency Offset Conditions

Efficient and Robust Detection of GFSK Signals under Dispersive Channel, Modulation Index Offset, and Carrier Frequency Offset Conditions
Efficient and Robust Detection of GFSK Signals under Dispersive Channel, Modulation Index Offset, and Carrier Frequency Offset Conditions
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 K bits worth of the received signal. However, through filtering over a singe 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.
1110-8657
2719-2729
Tibenderana, C
0aab6572-9b72-4324-8f81-c392470930a5
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Stewart, R W
c819965d-70b4-4689-8206-e6e444dcbf8e
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hoffman, M W
64ae7f46-bbce-4707-bc75-0b536a770451
Tibenderana, C
0aab6572-9b72-4324-8f81-c392470930a5
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Stewart, R W
c819965d-70b4-4689-8206-e6e444dcbf8e
Weiss, S
a1716781-351d-41d2-8d67-3e3d34f16476
Hoffman, M W
64ae7f46-bbce-4707-bc75-0b536a770451

Tibenderana, C and Weiss, S , Stewart, R W, Weiss, S and Hoffman, M W (eds.) (2005) Efficient and Robust Detection of GFSK Signals under Dispersive Channel, Modulation Index Offset, and Carrier Frequency Offset Conditions. EURASIP Journal of Applied Signal Processing, 2005 (16), 2719-2729.

Record type: Article

Abstract

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 K bits worth of the received signal. However, through filtering over a singe 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.

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Published date: December 2005
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 261258
URI: http://eprints.soton.ac.uk/id/eprint/261258
ISSN: 1110-8657
PURE UUID: 103e827d-b940-4341-893d-8da808cfd1d6

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Date deposited: 23 Sep 2005
Last modified: 14 Mar 2024 06:50

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Contributors

Author: C Tibenderana
Author: S Weiss
Editor: R W Stewart
Editor: S Weiss
Editor: M W Hoffman

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