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This paper presents some results on MMSE turbo equalization applied to real sea water trials in the Atlantic ocean. High order modulations (8-PSK, 16-QAM and 32-QAM) have been tested. The channel data rate on the underwater acoustic channel is up to 20 kbps. The receiver includes timing recovery, equalization, interleaving and channel coding. The results which are evaluated in term of bit error rate...
This paper addresses bit-interleaving for low-density parity-check (LDPC) coded modulation in AWGN and Rayleigh channels. We present an interleaving scheme that accounts for the different bit reliabilities inherent to higher-order modulation and the unequal error protection (UEP) properties of irregular LDPC codes. Therefore, we analyze the UEP properties and introduce a metric indicating the influence...
In this paper we present a simple modification of a classical turbo code allowing for improved distance properties and rate adaptation. The proposed scheme suggests the insertion of pilot bits in the data sequence in such a manner that low weight codewords are eliminated or their weight multiplicity being reduced. In this way, pilots are utilized to increase the minimum distance of the code effectively...
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