Results 71 to 80 of about 184,562 (108)

Flexible blocks for high throughput serially concatenated convolutional codes

Proceedings of the 17th ACM Great Lakes symposium on VLSI, 2007
Modern communication systems aim to integrate different services including telephony, multimedia applications and data transfer. This integration imposes to design flexible systems, able to support different frame duration and data-rates. In this paper we present several blocks employed in serially concatenated convolutional codes and we detail some ...
MARTINA, MAURIZIO, MASERA, Guido
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Serially concatenated convolutional coding for an optical PPM/CDMA system

The 6th International Conference on Advanced Communication Technology, 2004., 2004
In this paper, performance of on optical PPM/CDMA system with SCCC is analyzed and simulated. It is assumed that optical channel is on intensity modulated (IM) channel and direct-detection scheme is employed to defect the received optical signal. The modulation scheme used is pulse-position-modulation (PPM). The performance is evaluated in terms of bit
Jin Young Kim, Joo Chan Kim
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Performance of serial concatenated convolutional codes for data transmission in UMTS

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363), 2003
Serial concatenated convolutional coding with iterative decoding is examined for data transmission over the downlink of a W-CDMA system employing BPSK modulation and coherent RAKE receiver. Performance of serial concatenated convolutional coding is studied in a frequency selective Rayleigh fading channel.
Nguyen Vu Luu, R.M.A.P. Rajatheva, K. Makelainen   +2 more
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Serial concatenation schemes for space-time and recursive convolutional codes

The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring., 2004
Serial concatenation scheme with a space-time trellis code as the outer code and recursive convolutional codes as the inner code are compared. A new encoding/decoding structure characterized by the inner encoding by a single recursive convolutional code and the combined decoding of simultaneous symbols from multiple antennas is proposed, which gives a ...
Yong-Jo Ko, Jung-Im Kim
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Iterative decoding of serially concatenated convolutional codes applying the SOVA

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 2002
In numerous researches, the soft output Viterbi algorithm (SOVA) has been used for the iterative decoding of a parallel concatenated convolutional code (PCCC) instead of the maximum a posteriori (MAP) decoding algorithm having a suboptimal bounds to the maximum likelihood (ML) performance.
Suk-Hyun Yoon, Chang-Con Kang, Hayoung Yang   +2 more
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On Permutor Designs Based on Cycles for Serially Concatenated Convolutional Codes

IEEE Transactions on Communications, 2004
A new permutor design for serially concatenated convolutional codes is presented. It is based on the construction of a permutation matrix without short cycles of special types. For such a permutor, we give a lower bound on the minimum distance of the overall code that is significantly larger than that achievable with first-order separation (spreading ...
K.Sh. Zigangirov, Dmitri Truhachev, A. Huebner   +2 more
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Serially concatenated continuous phase modulation with ring convolutional codes

International Symposium onInformation Theory, 2004. ISIT 2004. Proceedings., 2004
Serially concatenated continuous phase modulation (SCCPM) systems with ring convolutional codes (CC) are investigated. Both EXIT chart and union bound techniques are used to compare with the simulation results and are used as analysis tools. The latter is for the first time generalized to a nonbinary interleaver for a serially concatenated system ...
T.R. Aulin, Ming Xiao
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On the Design of S-type Permutors for Double Serially Concatenated Convolutional Codes

2006 IEEE Information Theory Workshop, 2006
In this paper the impact of S-type permutors, i.e., permutors that provide a non-trivial separation, on the minimum distance of double serially concatenated convolutional codes is considered. A joint design of the outer and inner permutor is presented on the basis of a newly introduced permutor parameter - the so-called symbol span.
A. Huebner, Daniel J. Costello
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On parallel and serial concatenated convolutional codes over GF(4)

The 8th International Conference on Communication Systems, 2002. ICCS 2002., 2003
We compare the asymptotic performance of parallel concatenated codes (PCCs) and serial concatenated codes (SCCs) over GF(4). We construct such codes using optimal nonbinary convolutional codes where optimality is in the sense of achieving the largest minimum distance for a fixed number of encoder states.
A. Ghrayeb, T. Abualrub
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CTH08-3: Reconfigurable Analog Decoder for a Serially Concatenated Convolutional Code

IEEE Globecom 2006, 2006
In this paper, the design of a fully analog iterative decoder for a serially concatenated convolutional code is presented. The decoder is reconfigurable in both block length and code rate. An interleaver size up to 2400 bit is considered. The decoder core implements a single SISO working on a window of the whole code trellis.
A. GRAELL I. AMAT, D. VOGRIG, S. BENEDETTO, MONTORSI, Guido, A. NEVIANI, A. GEROSA   +5 more
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