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MULTIPLE TRELLIS CODED ORTHOGONAL TRANSMIT SCHEME FOR MULTIPLE ANTENNA SYSTEMS
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作者 Lv Shujuan Wei Guo Zhu Jinkang 《Journal of Electronics(China)》 2006年第3期355-360,共6页
In this paper, a novel multiple trellis coded orthogonal transmit scheme is proposed to exploit transmit diversity in fading channels. In this scheme, a unique vector from a set of orthogonal vectors is assigned to ea... In this paper, a novel multiple trellis coded orthogonal transmit scheme is proposed to exploit transmit diversity in fading channels. In this scheme, a unique vector from a set of orthogonal vectors is assigned to each transmit antenna. Each of the output symbols from the multiple trellis encoder is multiplied with one of these orthogonal vectors and transmitted from corresponding transmit antennas. By correlating with corresponding orthogonal vectors, the receiver separates symbols transmitted from different transmit antennas. This scheme can be adopted in coherent/differential systems with any number of transmit antennas. It is shown that the proposed scheme encompasses the conventional trellis coded unitary space-time modulation based on the optimal cyclic group codes as a special case. We also propose two better designs over the conventional trellis coded unitary space-time modulation. The first design uses 8 Phase Shift Keying (8-PSK) constellations instead of 16 Phase Shift Keying (16-PSK) constellations in the conventional trellis coded unitary space-time modulation. As a result, the product distance of this new design is much larger than that of the conventional trellis coded unitary space-time modulation. The second design introduces constellations with multiple levels of amplitudes into the design of the multiple trellis coded orthogonal transmit scheme. For both designs, simulations show that multiple trellis coded orthogonal transmit schemes can achieve better performance than the conventional trellis coded unitarv space-time schemes. 展开更多
关键词 SPACE-TIME trellis Code modulation (TCM) Multiple TCM (MTCM) DIFFERENTIAL UNITARY
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PERFORMANCE ANALYSIS FOR THE RECEIVER WITH ISI
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作者 仰枫帆 毕光国 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1995年第2期212-217,共6页
In this paper we use trellis coded amplitude modulation (TC-AM) as models to analyze the receivers with intersymbol interference (ISI) under BPSK and π/4-QPSK modulations.Using the modified generating function and th... In this paper we use trellis coded amplitude modulation (TC-AM) as models to analyze the receivers with intersymbol interference (ISI) under BPSK and π/4-QPSK modulations.Using the modified generating function and the weight profile function of the TC-AM,the bit error probability for both cases is evaluated in the sense of maximum likelihood decoding.The numerical result is given. 展开更多
关键词 intersymbol interferences maximum-likelihood decoding generating functions weight profile functions trellis coded modulation
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Performance Research on Turbo TCM Schemes Using Different Set Partitioning Strategies for Fading Channels
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作者 罗骥 袁东风 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2005年第1期53-58,共6页
Two different set partitioning strategies used in Turbo TCM, UP (Ungerboeck Partitioning) and BP (Block Partitioning) are compared over Rayleigh fading channels. The performance of Turbo TCM with the two set parti... Two different set partitioning strategies used in Turbo TCM, UP (Ungerboeck Partitioning) and BP (Block Partitioning) are compared over Rayleigh fading channels. The performance of Turbo TCM with the two set partitioning strategies and different frame length over Rayleigh fading channels is evaluated. The simulation results of 8PSK and 8ASK modulation and some significant conclusions are also given in this paper. 展开更多
关键词 TURBO turbo trellis code modulation set partitioning Rayleigh fading channel
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Coded overlapped code division multiplexing system with Turbo product structure 被引量:1
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作者 ZHOU Su-hua FANG Li LI Dao-ben 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2010年第2期25-29,共5页
Coded overlapped code division multiplexing system with Turbo product structure (TPC-OVCDM) is introduced, and trellis coded modulation (TCM) code is employed as error correcting code for uncoded overlapped code d... Coded overlapped code division multiplexing system with Turbo product structure (TPC-OVCDM) is introduced, and trellis coded modulation (TCM) code is employed as error correcting code for uncoded overlapped code division multiplexing (OVCDM) system. In such a scheme, row code and column code are TCM and OVCDM spreading code, respectively. Data bits are only encoded directly by TCM and transformed into a matrix. Each column of this matrix is then permuted by symbol interleaver before being encoded by OVCDM spreading code. During iterative decoding process in the receiver, two constituent decoders use symbol by symbol BCJR algorithm in the log domain. The order of decoding two sub-codes is determined by the encoding order. The proportion of TCM coding and OVCDM coding affects system performance. For fixed coding structure and symbol interleaver, the performance of TPC-OVCDM systems of different proportions of additive white Gaussian noise (AWGN) channel have been simulated. The results show that TPC-OVCDM system of reasonable proportion can achieve significant coding gain, compared with uncoded OVCDM system under the condition of same spectral efficiency at bit error rate (BER) level of 10^-5. 展开更多
关键词 overlapped code division multiplexing trellis coded modulation TPC-OVCDM iterative decoding
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