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- Fredrik Hekland, PÃ¥l Anders Floor, Tor A. Ramstad
- IEEE Transactions on Communications
- 2009

This paper deals with lossy joint source-channel coding for transmitting memoryless sources over AWGN channels. The scheme is based on the geometrical interpretation of communication by Kotel'nikovâ€¦ (More)

- Fredrik Hekland, Geir E. Ã˜ien, Tor A. Ramstad
- Data Compression Conference
- 2005

The Archimedes' spiral can be used as a 2:1 bandwidth reducing mapping in a joint source-channel coding (JSCC) system. The combined point of two iid Gaussian sources (the source space) is mapped, orâ€¦ (More)

- Arild Fuldseth, Tor A. Ramstad
- ICASSP
- 1997

Two methods for transmission of a continuous amplitude source signal over a continuous amplitude channel with a power constraint are proposed. For both methods, bandwidth reduction is achieved byâ€¦ (More)

- Sven Ole Aase, Tor A. Ramstad
- IEEE Trans. Image Processing
- 1995

This paper investigates the energy compaction capabilities of nonunitary filter banks in subband coding. It is shown that nonunitary filter banks have larger coding gain than unitary filter banksâ€¦ (More)

- Emrah Akyol, Kumar Viswanatha, Kenneth Rose, Tor A. Ramstad
- IEEE Transactions on Information Theory
- 2014

This paper studies the zero-delay source-channel coding problem, and specifically the problem of obtaining the vector transformations that optimally map between the m-dimensional source space andâ€¦ (More)

- Emrah Akyol, Kenneth Rose, Tor A. Ramstad
- 2010 Data Compression Conference
- 2010

This paper focuses on optimal analog mappings for zero-delay, distributed source-channel coding. The objective is to obtain the optimal vector trans- formations that map between m-dimensional sourceâ€¦ (More)

- Tor A. Ramstad
- 9th European Signal Processing Conferenceâ€¦
- 1998

In this article fractional rate sampling frequency change is considered. A general theory based on combined analog and digital interpolators is presented, a generalized Farrow structure isâ€¦ (More)

- Emrah Akyol, Kenneth Rose, Tor A. Ramstad
- 2010 IEEE Information Theory Workshop onâ€¦
- 2010

What is the optimal source-channel communication system for a given finite block length? The problem of obtaining the vector transformations that optimally map between the m-dimensional source spaceâ€¦ (More)

- PÃ¥l Anders Floor, Anna N. Kim, Tor A. Ramstad, Ilangko Balasingham, Niklas Wernersson, Mikael Skoglund
- IEEE Transactions on Communications
- 2012

In this paper, delay-free, low complexity, joint source-channel coding (JSCC) for transmission of two correlated Gaussian memoryless sources over a Gaussian Multiple Access Channel (GMAC) isâ€¦ (More)

- John M. Lervik, Tor A. Ramstad
- ICASSP
- 1996

A mixture distribution model is introduced to characterize the source statistics in a frequency domain image coder. More speciically, a Gaussian mixture distribution is shown to be a good statisticalâ€¦ (More)