TY - GEN
T1 - Trellis coded modulation using partially overlapped signal sets of non-equiprobable signaling
AU - Ariyoshi, M.
AU - Sasase, Iwao
PY - 1994/1/1
Y1 - 1994/1/1
N2 - In conventional trellis coded modulation (TCM), a higher-ary modulation scheme combining with a convolutional code is employed not to expand the transmitted bandwidth. This forces the system to be attended by signal constellation expansion and increasing the average signal power. As solutions to avoid signal constellation expansion, TCM systems using totally overlapped signal sets (TO-TCM and RU-TCM) were proposed. These schemes can realize a coded modulation system with no signal constellation expansion and achieve more coding gain than conventional TCM. However, a problem that the systems with totally overlapped signal sets might be catastrophic has been remained. The authors propose a novel TCM system using partially overlapped signal sets of nonequiprobable signaling (PO-TCM-NE). This scheme employs the partially overlapped signal constellation to control increasing signal points, and to avoid catastrophic error propagation. The nonequiprobable signaling is employed to reduce average signal power. Coding gain of proposed PO-TCM-NE is considerably improved; in consequence the average signal power is reduced much lower than other TCM systems with equiprobable signaling.
AB - In conventional trellis coded modulation (TCM), a higher-ary modulation scheme combining with a convolutional code is employed not to expand the transmitted bandwidth. This forces the system to be attended by signal constellation expansion and increasing the average signal power. As solutions to avoid signal constellation expansion, TCM systems using totally overlapped signal sets (TO-TCM and RU-TCM) were proposed. These schemes can realize a coded modulation system with no signal constellation expansion and achieve more coding gain than conventional TCM. However, a problem that the systems with totally overlapped signal sets might be catastrophic has been remained. The authors propose a novel TCM system using partially overlapped signal sets of nonequiprobable signaling (PO-TCM-NE). This scheme employs the partially overlapped signal constellation to control increasing signal points, and to avoid catastrophic error propagation. The nonequiprobable signaling is employed to reduce average signal power. Coding gain of proposed PO-TCM-NE is considerably improved; in consequence the average signal power is reduced much lower than other TCM systems with equiprobable signaling.
UR - http://www.scopus.com/inward/record.url?scp=85063396134&partnerID=8YFLogxK
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U2 - 10.1109/WNCMF.1994.529152
DO - 10.1109/WNCMF.1994.529152
M3 - Conference contribution
AN - SCOPUS:85063396134
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
SP - 558
EP - 562
BT - Wireless Networks - Catching the Mobile Future
A2 - Prasad, Ramjee
A2 - Arnbak, Jens C.
A2 - Weber, Jos H.
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 5th IEEE Intemational Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 1994
Y2 - 18 September 1994 through 22 September 1994
ER -