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— Cyclic Delay Diversity (CDD) is a simple approach to introduce spatial diversity to an Orthogonal Frequency Division Multiplexing (OFDM) based transmission scheme that itself has no built-in diversity. It also can be regarded as a Space-Time Code (STC). But in contrast to that there is no additional effort in the receiver necessary, since the different(More)
In this paper we address the extrinsic information transfer functions of inner decoders for a serially concatenated coding scheme. For the case of an AWGN channel, we give a universal proof for the fact that only inner encoders yielding an infinite output weight for a weight-one input sequence, such as recursive convolutional encoders, lead to perfect(More)
—Cyclic Delay Diversity (CDD) is a simple approach to increase the frequency selectivity of the channel as seen by the receiver in an Orthogonal Frequency Division Multiplexing (OFDM) based transmission scheme. The reason for this is that CDD inserts virtual echos. Due to the virtual multipath components carriers experience different channels if the antenna(More)
In this paper we introduce a new coding scheme - so-called laminated turbo codes. It is characterized by a block-convolutional structure that enables us to combine the advantages of a convolutional encoder memory and a block-oriented decoding method. We show that this block-convolutional structure is superior in terms of its error correction capability(More)
In this paper, a new class of codes is presented that features a block-convolutional structure-namely, laminated turbo codes. It allows combining the advantages of both a convolutional encoder memory and a block permutor, thus allowing a block-oriented decoding method. Structural properties of laminated turbo codes are analyzed and upper and lower bounds on(More)
is a simple multiple transmit antenna approach to increase the frequency selectivity of the channel seen at a single antenna receiver. This is due to the insertion of virtual echos caused by the antenna specific cyclic delays in the time domain at the transmitter. On each antenna a shifted version of the signal is sent, with these shifts being performed in(More)