Hybrid Digital–Analog Source–Channel Coding for Bandwidth Compression/Expansion

Bandwidth Extension with Hybrid Signal Extrapolation for Audio Coding

In this paper, we propose a blind method using hybrid signal extrapolation at the decoder to regenerate lost high-frequency components which are removed by encoders. At first, a decoded signal spectral resolution is enhanced by time domain linear predictive extrapolation and then the cut off frequency of each frame is estimated to avoid the spectrum gap between the end of original low frequency...

Hybrid digital-analog coding with bandwidth expansion for correlated Gaussian sources under Rayleigh fading

Consider communicating a correlated Gaussian source over a Rayleigh fading channel with no knowledge of the channel signal-to-noise ratio (CSNR) at the transmitter. In this case, a digital system cannot be optimal for a range of CSNRs. Analog transmission however is optimal at all CSNRs, if the source and channel are memoryless and bandwidth matched. This paper presents new hybrid digital-analo...

New Coding Techniques for Improved Bandwidth Utilization

Bandwidth Efficient Coding for Error Control

One of the dramatic developments in bandwidth-efficient communications over the past few years is the introduction and rapid applications of combined coding and bandwidth efficient modulation, known as coded modulation, for error control. Using coded modulation, reliable data transmission can be attained without compromising bandwidth efficiency. In this report, we present the basic concepts of...

New Bandwidth Efficient Parallel Concatenated Coding

We propose a new solution to parallel concatenation of trellis codes with multilevel amplitude/phase modulations and a suitable iterative decoding structure. Examples are given for throughputs 2 bits/see/Hz with 8PSK and 16QAM signal constellations. For parallel concate* Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Techno...