In this paper, we consider the use of sequential decoding methods to reduce the complexity of the channel decoder for turbo coded magnetic recording channels. The partial response equalized magnetic recording channel is suitably precoded to give a recursive structure for the channel trellis. The soft-in/soft-out Twin Stack decoding technique is then used to decode this recursive trellis. Simulation results show that the performance of the proposed decoding technique is within 0.6 dB for a PR4 channel and within 1.1 dB for a EPR4 channel in comparison to the BCJR decoder, while the complexity of the decoder decreases by a factor 1/(Number of channel states).
We present an integrated telemetry data link and network architecture system solution, developed by Mayflower for the Air Force, AFFTC, Edwards AFB, CA, based on third generation UMTS cellular standards. The data link, called COTS Affordable Data Link System (CADLS), accommodates high mobility user applications typical of tactical fighter aircraft. The data network, called Telemetry/TSPI Data Network (TDN), uses enhancements such as a multi-tiered network protocol structure to provide flexible IP-based transport, work with multiple air interface protocols, accommodate test platform mobility, and integrate seamlessly with unified infrastructure such as Test and Training Enabling Architecture (TENA). The end-to-end CADLS/TDN datalink network system, described in this paper, is a 2-way, asymmetric IP-based wireless network system, and as such it is a potential candidate technology to support the DoD CETIP integrated Network Enhanced Telemetry (iNET) project. The integrated CADLS/TDN system is at an advanced stage of prototype development. We present the integrated CADLS/TDN system architecture, its features and capabilities, and the laboratory prototype developed under the Air Force program.
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