NASA Technical Reports Server (NTRS) 19970041041: Concatenated Coding Using Trellis-Coded Modulation - Info and Reading Options
By NASA Technical Reports Server (NTRS)
"NASA Technical Reports Server (NTRS) 19970041041: Concatenated Coding Using Trellis-Coded Modulation" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 19970041041: Concatenated Coding Using Trellis-Coded Modulation” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19970041041: Concatenated Coding Using Trellis-Coded Modulation
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
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- Internet Archive ID: NASA_NTRS_Archive_19970041041
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"NASA Technical Reports Server (NTRS) 19970041041: Concatenated Coding Using Trellis-Coded Modulation" Description:
The Internet Archive:
In the late seventies and early eighties a technique known as Trellis Coded Modulation (TCM) was developed for providing spectrally efficient error correction coding. Instead of adding redundant information in the form of parity bits, redundancy is added at the modulation stage thereby increasing bandwidth efficiency. A digital communications system can be designed to use bandwidth-efficient multilevel/phase modulation such as Amplitude Shift Keying (ASK), Phase Shift Keying (PSK), Differential Phase Shift Keying (DPSK) or Quadrature Amplitude Modulation (QAM). Performance gain can be achieved by increasing the number of signals over the corresponding uncoded system to compensate for the redundancy introduced by the code. A considerable amount of research and development has been devoted toward developing good TCM codes for severely bandlimited applications. More recently, the use of TCM for satellite and deep space communications applications has received increased attention. This report describes the general approach of using a concatenated coding scheme that features TCM and RS coding. Results have indicated that substantial (6-10 dB) performance gains can be achieved with this approach with comparatively little bandwidth expansion. Since all of the bandwidth expansion is due to the RS code we see that TCM based concatenated coding results in roughly 10-50% bandwidth expansion compared to 70-150% expansion for similar concatenated scheme which use convolution code. We stress that combined coding and modulation optimization is important for achieving performance gains while maintaining spectral efficiency.
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