A turbo-coded burst-by-burst adaptive wide-band speech transceiver

Abstract

Abstract-Turbo-coded burst-by-burst adaptive orthogonal frequency division multiplex (AOFDM) wide-band speech transceivers are proposed. A constant throughput adaptive OFDM transceiver was designed and benchmarked against a time-variant rate scheme. The proposed joint adaptation of source-codec, channel-codec, and modulation regime results in attractive, robust, high-quality audio systems, capable of conveying near-unimpaired wide-band audio signals over fading dispersive channels for signal-to-noise ratios (SNR) in excess of about 5 dB.

Combined turbo coding and hierarchical QAM for unequal error protection of H.264 coded video

“…This is achieved without compromising the increase in s HP , and provides a decodable service over a range of channel SNRs greater than that possible with turbo coding alone. The performance over a fading channel (a COST 207 model with four paths [16]) is shown in Fig. 8.…”

H.264 Layered Coded Video over Wireless Networks: Channel Coding and Modulation Constraints

“…The unequal-error-protected transmission of data-partitioned and SNR-scalable coded video have been simulated in a Gaussian channel as well as in a fading environment (COST 207 model [11]) with a constant total channel rate of ch = 100 kbps. For forward error correction we employed turbo codes with generators G1 = 5 and G2 = 7 and a Log-MAP algorithm with three iterations in the decoder.…”

Near-Instantaneously Adaptive HSDPA-Style OFDM Versus MC-CDMA Transceivers for WIFI, WIMAX, and Next-Generation Cellular Systems

“…By contrast, although capable of providing frequency domain diversity with the aid of averaging the channel qualities of several subcarriers, MC-CDMA is less amenable to frequency domain adaptation, than to time domain adaptation. In order to contribute towards the next-generation system studies, the aim of the rest of this contribution is to compare the performances of space-time as well as turbo coded adaptive OFDM and MC-CDMA modems [218], [220], [221]. Fig.…”