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Career Interests
- Adaptive Signal Processing
- Computer Programming
- Digital Signal Processing
- DSP Hardware Programming
- Optical Communications Design Services
- Speech Coding
- Speech Recognition
- Systems modelling
- Wireless Communication Systems
Recent work
IceFyre Semiconductor Inc.
- IEEE802.11a 5.2GHz WLAN system-on-a-chip design.
- System level design, architecture, PAPR reduction
algorithms for OFDM.
- Analog specifications, digital receiver, tracking and
acquisition algorithms.
- IEEE802.11 b/g system design.
Government of Canada.
- Analog signal processing and conditioning.
- Speech compression algorithms (SPEEX and Adaptive Multirate
Wideband).
- Multi-microphone beam steering algorithms.
- Speech enhancement algorithms.
Valert Inc.
- 115.2kbps ASK communiction system at 916.5MHz.
SiGEM Inc.
- TMS320C54x DSP algorithm for GPS carrier/data recovery.
SOMA Networks Inc.
- Cellular capacity analysis for adaptive rate FWA system.
Conexant Systems Inc.
- "Blue-tooth" radio architecture design. 2.4GHz ISM band.
1Mbps and 20Mbps short-range FHSS GMSK.
- System level design, architecture, complex filtering,
RSSI,AGC DC compensation algorithms.
- Complex PLL, Binary FSK and quadricorrelator detection
for Gaussian FSK.
- NEC WCDMA frequency planning and radio architecture
system level design.
- 3G PCS standard architecture development using
synthesizer and ADC techniques.
Square Peg Communications Inc.
- Inmarsat GDU up and downconverter synthesizer card
design. Ultra small form factor. Dual PLL, 70MHz interface.
- L-band down converter for in-flight services phone/data
communications.
- IPDS up/downconverter support, including Rx and Tx
multi-pole elliptical filter design.
- Aeronautical GDU up and down converter design,
breadboard, debug, including double conversion architecture,
synthesizers, VCO's. -96dBc/Hz @ 3KHz offset.
- "Safety Turtle" design migration to EU frequencies, 433
MHz.
JDS Uniphase Inc.
- OC192 (10Gbps) ultra small form factor transceiver
design.
- FEC analysis for 10.7Gbps transmissions.
- OC48 (2.488Gbps) differential Transimpedance amplifier
and main-amplifier re-design.
- DPSK 128kbps optical supervisory channel design and
implementation, BER < 1e-6.
- BFSK 33kbps optical supervisory channel design and
implementation, BER < 1e-6.
- Bit Error Rate tester for OC3/12/48 and Gigabit Ethernet.
Sedona Networks (formerly NetPoint Inc)
- VoIP Network Simulator for lost and delayed frames.
- Delivery of twoTiger 549/PC development systems including
Code Composer, TI C Compiler and Assembly Language Tools.
- Direct Link PCM interface, double-buffered Codec-to-SLIC-to-Phoneset
interface.
DRS Flight Systems
- Aircraft Health Usage Monitoring System (HUMS): Design,
development and integation of low and high accuracy Analog
Data Acquisition (ADA) Cards with analog front end, P
controlled A/D sampling, TMS320C31 embedded S/W (written in C)
and DSP processing, 2-pole and 4-pole IIR filtering, FFT,
interprocessor communication, Quicklogic FPGA for address
decoding and wait-state generator, SRAM, FLASH memory, DPRAM
with H/W semaphores. White Mountain development platform,
CodeWright, GO-DSP Code Composer Debugger.
DREO CRC Shirley's Bay, Ottawa
- Classification of radar doppler signals using recurrent
and non-recurrent radial basis functions, feed-forward neural
networks and K-nearest neighbours algorithm. Algorithms
written in Matlab and C.
- Assist in preparation of report summarizing results.
07/95 to 10/96 Consultant, SPAR Applied Systems Group,
Kanata
- 406 MHz phase locked ELT debug and revision. Packet
transmission, PSK, BCH forward error correction, Alterra FPGA.
Education
Ph.D. [Systems and Computer Engineering]
Carleton
University. Thesis: Nonlinear Adaptive Filtering with Application
to Acoustic Echo Cancellation.
M. Eng. [Electronics]
1988, with distinction.
Thesis: A SAW based Transversal Filter for Adaptive Time Domain
Equalization.
B. Eng. [Electronics]
1983, with distinction. Scholarships
NSERC 1992. Ontario Graduate Scholarship 1994
Publications
1) S. Rauhala, N. Birkett, J. Wight , “Performance Analysis of a
Frequency Offset Correction Method for an OFDM System” IASTED
International Conference on Wireless and Optical Communication
Banff, July, 2002 and Wireless 2002 Conference, Calgary.
2) Dr. Norm Filiol, Dr. Neil Birkett, Dr. James Cherry et al. "A
22mW Bluetooth RF transceiver with Direct RF Modulation and on-chip
filtering" ISSCC 2000 paper TP13.4.
3) A. N. Birkett, “Nonlinear Adaptive Filtering with Application
to Acoustic Echo Cancellation”, Ph.D. Thesis, Carleton University,
1997.
4) A.N. Birkett, R.A. Goubran, "Conjugate Gradient Reuse
Algorithm Using a Variable Step-Size Line Search", 1997 I.E.E.E.
International Symposium on Circuits and Systems, Hong Kong,
June 1997.
5) A.N. Birkett, R.A. Goubran, "Nonlinear adaptive filtering with
FIR synapses and adaptive activation functions", Proceedings
I.E.E.E. International Conference on Acoustics, Speech and
Signal Processing, Munich, April 1997.
6) N. Birkett, R. A. Goubran, "Nonlinear loudspeaker compensation
for handsfree acoustic echo cancellation", IEE Electronics
Letters, Vol. 32, No. 12, pp. 1063-1064, June 1996.
7) A.N. Birkett, R.A. Goubran, "Fast nonlinear adaptive filtering
using a partial conjugate gradient algorithm", Proceedings
I.E.E.E. International Conference on Acoustics, Speech and
Signal Processing, Atlanta Georgia, Vol 6, pp. 3542-3545, May
1996.
8) A.N. Birkett, R. A. Goubran, "Limitations of Handsfree
Acoustic Echo Cancellers due to Nonlinear Loudspeaker Distortion and
Enclosure Vibration Effects", in 1995 I.E.E.E. ASSP Workshop on
Appl. of Sig. Proc. to Aud. and Acoustics, New Paltz, New York,
Oct. 1995.
9) A.N. Birkett, R.A. Goubran, "Nonlinear echo cancellation using
a partial adaptive time delay neural network" Neural Networks for
Signal Processing V: Proceedings of the 1995 IEEE Workshop, pp.
249-258, Aug. 1995.
10) A.N. Birkett, R.A. Goubran, "Acoustic Echo Cancellation Using
NLMS-Neural Network Structures", Proceedings I.E.E.E.
International Conference on Acoustics, Speech and Signal Processing.
Detroit, Vol. 5, pp. 3035-3038, 1995.
11) A.N. Birkett, R.A. Goubran, "Acoustic echo cancellation for
handsfree telephony using neural networks" Neural Networks for
Signal Processing IV: Proceedings of the 1994 IEEE Workshop, pp.
249-258, Aug. 1994.
12) A. N. Birkett, “A SAW Based Transversal Filter for Adaptive
Time-Domain Equalization”, M. Eng. Thesis, 1988.
Patents
- SAW Device Tapped Delay Line and Equalizer, U.S.
Patent 5,051,709. Sept., 1991
- SAW Device Tapped Delay Line and Apparatus Using Same,
Canadian Patent 606,058. Nov. 1991.
- Complex Phase-Locked Loop Demodulator for Low-IF and Zero-IF
Radio Receivers, Patent CA2284948 April 4, 2001.
- Method and Apparatus for Dynamically Generating Multiple
Level Decision Thresholds of an M-ARY Coded Signal, Patent
CA2296209 July 7, 2001
- Complex Filtering/AGC Radio Receiver Architecture for
Low-IF or Zero-IF European Patent #
00974201.6-2411-CA0001297, June 19, 2002
- An M-ary PSK classifier for improved packet detection
capability. Patent application November 2002.
- A complex domain frequency offset circuit for OFDM. Patent
application January 2003.
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