Title :
Packet combining systems based on the Viterbi decoder
Author :
Harvey, Bruce A. ; Wicker, Stephen B.
Author_Institution :
Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
Several packet combining schemes are presented for use in conjunction with the Viterbi decoder over stationary and time-varying channels. The first technique presented is an average diversity combiner. The averaged diversity combiner is then generalized to make use of packet weights either based on ideal channel state information or derived from side information generated by the Viterbi decoder. It is shown that the weighted diversity combiner using decoder side information performs almost as well as the system using ideal channel state information. All of the packet combining schemes discussed provide improved throughput and reliability performance relative to that provided by the standard type-I hybrid-ARQ (automatic-repeat-request) or FEC (forward error correction) systems. Performance bounds are derived for each of the combining schemes, and their tightness is verified through simulation results
Keywords :
decoding; packet radio networks; packet switching; Viterbi decoder; average diversity combiner; packet combining schemes; reliability; stationary channels; time-varying channels; weighted diversity combiner; Channel state information; Convolutional codes; Decoding; Diversity reception; Error correction; Interleaved codes; Protocols; Throughput; Time-varying channels; Viterbi algorithm;
Conference_Titel :
Military Communications Conference, 1992. MILCOM '92, Conference Record. Communications - Fusing Command, Control and Intelligence., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0585-X
DOI :
10.1109/MILCOM.1992.244130