A system and method for wireless communication between a plurality of subscriber units and a base station, the base station communicating information signals from an originating source to a destination subscriber unit over a channel at an assigned one of a plurality of frequencies using repetitive time frames, each said time frame comprising a sequence of time slots. The channel is defined as having the same one or more time slots from the sequence of time slots in one or more of the time frames. The base station includes a central processing unit capable of assigning a duration of time for the information signals being sent to the destination subscriber unit. The duration equals the duration of one or more time slots in the same frame. The central processing unit maintains a memory of which time slots of each time frame have been assigned and provides the time slot assignment, and therefore channel assignment, by consulting said memory. The system includes a multiplexer for multiplexing the information signals onto the assigned channel; and a transmitter for transmitting the information signals to the destination subscriber unit using the assigned channel.

Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels

Since the early 1970s, for power-limited applications, the convolutional code constraint length K=7 and rate 1/2, optimum in the sense of maximum free distance and minimum number of bit errors caused by remerging paths at the free distance, has become the de facto standard for coded digital communication. This was reinforced when punctured versions of this code became the standard for rate 3/4 and 7/8 codes for moderately bandlimited channels. Methods are described for using the same K=7, rate 1/2 convolutional code with signal phase constellations of 8-PSK and 160PSK and quadrature amplitude constellations of 16-QASK, 64-QASK, and 256-QASK to achieve, respectively, 2 and 3, and 2, 4, and 6 b/s/Hz bandwidth efficiencies while providing power efficiency that in most cases is virtually equivalent to that of the best Ungerboeck codes for constraint length 7 or 64 states. This pragmatic approach to all coding applications permits the use of a single basic coder and decoder to achieve respectable coding (power) gains for bandwidth efficiencies from 1 b/s/Hz to 6 b/s/Hz. >

A pragmatic approach to trellis-coded modulation

A 2L-dimensional multiple phase-shift keyed (L*MPSK) signal set is obtained by forming the Cartesian product of L two-dimensional MPSK signal sets. A systematic approach to partitioning L*MPSK signal sets that is based on block coding is used. An encoder system approach is developed. It incorporates the design of a differential precoder, a systematic convolutional encoder, and a signal set mapper. Trellis-coded L*4PSK, L*8PSK, and L*16PSK modulation schemes are found for 1 >

https://ink.library.smu.edu.sg/cgi/viewcontent.cgi?article=1094&context=sis_research

Trellis-coded multidimensional phase modulation

https://www.dtc.umn.edu/s/resources/gg-se.pdf

A bibliography on nonlinear system identification

The evolution of high rate data services within future wireless networks will call for new RF access technologies to enable substantial increases in overall system spectral efficiency at an acceptably low cost to the user. Space-Time Coding (STC) is an antenna array processing technology currently simulating considerable Interest across the wireless industry. The invention provides a space-time coding apparatus having an input, a trellis encoder, a modulator, a demultiplexer, and a set of signal outputs wherein the input is operable to receive a stream of data. This allows de-multiplexing to take place after coding and modulation has been performed. The trellis encoder comprises a convolutional encoder operable to sequentially group data to provide coded bits to provide QPSK symbols. By the selection of convolutional encoder rates and/or modulation alphabets STCs of any desired dimensionality may be produced including multi-dimensional codes.

Space-time coding and channel estimation scheme, arrangement and method

Convolutional coding coupled with 16-PSK modulation is investigated for bandwidth efficient transmission. Rate 3/4, small memory codes are found which are optimized in the free-distance sense on the Gaussian channel. These codes provide up to 4.8 dB of coding gain with 32 states over uncoded 8-PSK, a scheme having the same spectral efficiency as the codes described. The performance is compared with earlier findings of Ungerboeck and some recent results on R = 2/3 coded 8-PSK. In addition, we present results of a channel transmission study to assess the performance of the four-state code on the band-limited nonlinear channel, and find that performance of the coded scheme degrades comparably with uncoded 8-PSK, i.e., coding gain is roughly preserved.

Rate 3/4 Convolutional Coding of 16-PSK: Code Design and Performance Study

The use of 16-QAM on bandlimited nonlinear satellite channels, in uncoded and trellis-coded form, for bandwidth efficient modulation (ideally 4 bps/Hz) is discussed To avoid severe degradation due to AM/AM and AM/PM distortion, or to avoid the need for large back-off, predistorting the 16-QAM constellation at the modulator is considered Performance for varying back-off settings for uncoded and coded 16-QAM is simulated, and it is found that the four-state trellis code has a coding gain of about 8 dB, larger than expected based on linear channel analysis, while the 16-state code gains only marginally beyond this

16-QAM and trellis-coded 16-QAM on nonlinear channels

More than luck: ideas Australia needs now is a collection of ideas for citizens who want real change and a to-do list for politicians looking to base public policies on the kind of future Australia needs. Editors Mark Davis and Miriam Lyons showcase practical steps we can take to share this country's good luck amongst all Australians - now and in the future.

More than Luck

Saturday’s political earthquake demonstrates Australians do not like the way their political system
is working. This is a critical message. Community distrust and cynicism are bad for the major
parties and bad for public policy. Australia faces many big challenges – a three speed economy,
a second round of the resources boom, skills shortages, infrastructure deficits, climate change,
refugees, indigenous recognition, to name only a few. But the past election campaign did nothing
to crystallise choices or to build an informed public opinion on any of these issues.

A blueprint for Australian democracy: this moment and the renewal of parliament, government and elections

In this draft discussion paper Emma Dawson and Miriam Lyons outline the basic principles that should underpin our public broadcasting policy, and toss around a few ideas on how to equip the ABC and SBS to meet the needs of Australian citizens.

Miriam Lyons

Papers

Rate 3/4 Convolutional Coding of 16-PSK: Code Design and Performance Study

16-QAM and trellis-coded 16-QAM on nonlinear channels

More than Luck

A blueprint for Australian democracy: this moment and the renewal of parliament, government and elections

Australia's public broadcasters: discussion paper