P. Frenger, P. Orten, T. Ottosson and A. Svensson, "Rate compatible convolutional codes for multichannel systems," Tech. Rep. 19, Dep. of Information Theory, Chalmers University of Technology, Sweden, Sept. 1997. C  Home/Search   Document Not in Database   Summary   Related Articles   Check

....CRC bits were found as the shortest one which fulfil this requirement. A 6 bit zero tail is appended to the error detection code for hybrid ARQ schemes to form the resultant sequence . The convolutional encoder uses a (3, 1, 6) mother code with generator polynomials (133, 165, 171) given in octal [13]. The puncturing matrix is a matrix with period 2.The puncturing position is specified relative to the previous lower code rate and the additional puncturing position by the row and column number in the puncturing matrix. Then the positions (2,2) 2,1) 3,2) and (3,1) correspond to the code ....

P. Frenger, P. Orten, T. Ottosson and A. Svensson, "Rate compatible convolutional codes for multichannel systems," Tech. Rep. 19, Dep. of Information Theory, Chalmers University of Technology, Sweden, Sept. 1997. C

....way should be used. With the present technology it is possible to implement Viterbi decoders for constraint lengths up to at least 10. For example, the North American CDMA standard (IS 95) uses constraint length 9 codes [20, p. 114] Frenger, Orten, Ottosson and Svensson have therefore in [12,13] presented new codes with longer constraint lengths, wider range of code rates and high resolution of code rates. The RCPC coding scheme is considered to be a strong candidate for both the TDMA and CDMA based modes in the personal communication system currently being studied within the European ....

....ARQ scheme for bad channel conditions. In [15] some new hybrid schemes based on RCPC codes are proposed and compare with previously studied schemes. Four hybrid type II ARQ schemes (schemes 2 5) are compared to a simple ARQ scheme (scheme 1) The type II schemes use RCPC encoders (can be found in [13]) based on a rate 1=3 constraint length 7 parent code and a puncturing period of p = 2. The possible code rates are 1, 2=3, 1=2, 2=5, and 1=3. The channel block length is L p which in simulations and analysis were assumed to be either 64 or 256 bits. More details on the ARQ schemes may be found in ....

P. Frenger, P. Orten, T. Ottosson, and A. Svensson, "Rate compatible convolutional codes for multichannel systems," Tech. Rep. 19, Department of Information Theory, Chalmers University of Technology, Sweden, Sept. 1997.

....thus also a limited range of code rates) Furthermore, because only codes with constraint lengths 7 or lower have been found, these codes are of limited applicability in cellular systems, where constraint lengths of at least 9 are expected. Frenger, Orten, Ottosson, and Svensson have therefore in [8,9] presented new codes with longer constraint lengths, wider range of code rates and high resolution of code rates. The RCPC coding scheme is considered to be a strong candidate for both the TDMA and CDMA based modes in the personal communication system currently being studied within the European ....

....ARQ scheme for bad channel conditions. In [11] some new hybrid schemes based on RCPC codes are proposed and compare with previously studied schemes. Four hybrid type II ARQ schemes (schemes 2 5) are compared to a simple ARQ scheme (scheme 1) The type II schemes use RCPC encoders (can be found in [9]) based on a rate 1=3 constraint length 7 parent code and a puncturing period of p = 2. The possible code rates are 1, 2=3, 1=2, 2=5, and 1=3. The channel block length is L p which in simulations and analysis were assumed to be either 64 or 256 bits. More details on the ARQ schemes may be found in ....

P. Frenger, P. Orten, T. Ottosson, and A. Svensson, "Rate compatible convolutional codes for multichannel systems," Tech. Rep. 19, Department of Information Theory, Chalmers University of Technology, Sweden, Sept. 1997.

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