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Papers by Norman Secord
Information Theory and Applications, 1994
... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research... more ... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research Institute Telecommunications Research Institute of Ontario February 1994 T. Aaron Gulliver Norman ... XI Throughput increase of ALOHA-based systems with multiuser sequence... ...
Wcnc 1999 Ieee Wireless Communications and Networking Conference, Feb 1, 1999
[Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE, 1992
ABSTRACT
The influence of the lowpass filter at the front end of a digital group demodulator on the number... more The influence of the lowpass filter at the front end of a digital group demodulator on the number of usable satellite communication channels is discussed. A Monte Carlo simulation study was undertaken using a raised cosine filter as the lowpass filter response. The group demodulator was designed to accommodate 16 channels of quadrature phase shift keying data with a channel spacing equal to twice the symbol rate. In particular, it is shown that the proper design of this lowpass filter can provide several additional channels. The effects of fading and shadowing on the performance of a signal that is group demodulated are also discussed. The results indicate that the inter-channel interference that is present due to the close channel spacing of the signals combines with the fading to produce a severely distorted signal. This indicates that new receiver structures and the introduction of coding will be required to combat the fading, shadowing, and inter-channel interference for land mo...
IEEE Transactions on Vehicular Technology, 1993
ABSTRACT
IEEE Transactions on Information Theory, 1989
IEEE Transactions on Vehicular Technology, 1991
The authors describe computer models for Rayleigh, Rician, log-normal, and land-mobile-satellite ... more The authors describe computer models for Rayleigh, Rician, log-normal, and land-mobile-satellite fading channels. All computer models for the fading channels are based on the manipulation of a white Gaussian random process. This process is approximated by a sum of sinusoids with random phase angle. These models compare very well with analytical models in terms of their probability distribution of envelope and phase of the fading signal. For the land mobile satellite fading channel, results of level crossing rate and average fade duration are given. These results show that the computer models can provide a good coarse estimate of the time statistic of the faded signal. Also, for the land-mobile-satellite fading channel, the results show that a 3-pole Butterworth shaping filter should be used with the model. An example of the application of the land-mobile-satellite fading-channel model to predict the performance of a differential phase-shift keying signal is described.
IEEE Transactions on Vehicular Technology, 1991
Applicable Algebra in Engineering, Communication and Computing, 1999
The atomic vectors of a finitely generated vector space C over a field F are characterized for C ... more The atomic vectors of a finitely generated vector space C over a field F are characterized for C a subspace of the product vector space ? = ∏i =1n ?i over F. For finite fields, the minimal trellis diagram for mixed-codes is determined, and this provides the L-section minimal trellis diagram for linear codes. As an example, an extremely simple yet comprehensive analysis of the trellis structure of Reed-Muller codes is given. In particular, a trellis oriented generator matrix for the 2l -section minimal trellis diagram of a Reed-Muller code is presented.
The trellis complexity of a linear block code C over a field F is presented for C a subspace of t... more The trellis complexity of a linear block code C over a field F is presented for C a subspace of the vector space V=∏ i=1 n V i over F, where V i (1≤i≤n) is a vector space over F. A generator matrix for the Reed-Muller codes is presented which is in trellis oriented form for the minimal L-section trellis diagram.
... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research... more ... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research Institute Telecommunications Research Institute of Ontario February 1994 T. Aaron Gulliver Norman ... XI Throughput increase of ALOHA-based systems with multiuser sequence... ...
Information Theory and Applications, 1994
... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research... more ... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research Institute Telecommunications Research Institute of Ontario February 1994 T. Aaron Gulliver Norman ... XI Throughput increase of ALOHA-based systems with multiuser sequence... ...
Wcnc 1999 Ieee Wireless Communications and Networking Conference, Feb 1, 1999
[Conference Record] GLOBECOM '92 - Communications for Global Users: IEEE, 1992
ABSTRACT
The influence of the lowpass filter at the front end of a digital group demodulator on the number... more The influence of the lowpass filter at the front end of a digital group demodulator on the number of usable satellite communication channels is discussed. A Monte Carlo simulation study was undertaken using a raised cosine filter as the lowpass filter response. The group demodulator was designed to accommodate 16 channels of quadrature phase shift keying data with a channel spacing equal to twice the symbol rate. In particular, it is shown that the proper design of this lowpass filter can provide several additional channels. The effects of fading and shadowing on the performance of a signal that is group demodulated are also discussed. The results indicate that the inter-channel interference that is present due to the close channel spacing of the signals combines with the fading to produce a severely distorted signal. This indicates that new receiver structures and the introduction of coding will be required to combat the fading, shadowing, and inter-channel interference for land mo...
IEEE Transactions on Vehicular Technology, 1993
ABSTRACT
IEEE Transactions on Information Theory, 1989
IEEE Transactions on Vehicular Technology, 1991
The authors describe computer models for Rayleigh, Rician, log-normal, and land-mobile-satellite ... more The authors describe computer models for Rayleigh, Rician, log-normal, and land-mobile-satellite fading channels. All computer models for the fading channels are based on the manipulation of a white Gaussian random process. This process is approximated by a sum of sinusoids with random phase angle. These models compare very well with analytical models in terms of their probability distribution of envelope and phase of the fading signal. For the land mobile satellite fading channel, results of level crossing rate and average fade duration are given. These results show that the computer models can provide a good coarse estimate of the time statistic of the faded signal. Also, for the land-mobile-satellite fading channel, the results show that a 3-pole Butterworth shaping filter should be used with the model. An example of the application of the land-mobile-satellite fading-channel model to predict the performance of a differential phase-shift keying signal is described.
IEEE Transactions on Vehicular Technology, 1991
Applicable Algebra in Engineering, Communication and Computing, 1999
The atomic vectors of a finitely generated vector space C over a field F are characterized for C ... more The atomic vectors of a finitely generated vector space C over a field F are characterized for C a subspace of the product vector space ? = ∏i =1n ?i over F. For finite fields, the minimal trellis diagram for mixed-codes is determined, and this provides the L-section minimal trellis diagram for linear codes. As an example, an extremely simple yet comprehensive analysis of the trellis structure of Reed-Muller codes is given. In particular, a trellis oriented generator matrix for the 2l -section minimal trellis diagram of a Reed-Muller code is presented.
The trellis complexity of a linear block code C over a field F is presented for C a subspace of t... more The trellis complexity of a linear block code C over a field F is presented for C a subspace of the vector space V=∏ i=1 n V i over F, where V i (1≤i≤n) is a vector space over F. A generator matrix for the Reed-Muller codes is presented which is in trellis oriented form for the minimal L-section trellis diagram.
... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research... more ... Carleton University -IEEE Information Theory Society -IEEE Region 7 -Ottawa Carleton Research Institute Telecommunications Research Institute of Ontario February 1994 T. Aaron Gulliver Norman ... XI Throughput increase of ALOHA-based systems with multiuser sequence... ...