Iterative Detection and Decoding Algorithms for MIMO Systems in Block-Fading Channels Using LDPC Codes

作者：Uchoa Andre G D^*; Healy Cornelius T^*; de lamare Rodrigo C^*

来源：IEEE Transactions on Vehicular Technology, 2016, 65(4): 2735-2741.

DOI：10.1109/TVT.2015.2432099

• Block-fading channels
• iterative detection and decoding (IDD) schemes
• low-density parity-check (LDPC) codes
• multiple-input multiple-output (MIMO) systems

We propose iterative detection and decoding (IDD) algorithms with low-density parity-check (LDPC) codes for multiple-input multiple-output (MIMO) systems operating in block-fading and fast Rayleigh fading channels. Soft-input-soft-output minimum-mean-squareerror (MMSE) receivers with successive interference cancelation are considered. In particular, we devise a novel strategy to improve the bit error rate (BER) performance of IDD schemes, which takes into account the soft a posteriori output of the decoder in a block-fading channel when root-check LDPC codes are used. A MIMO IDD receiver with soft information processing that exploits the code structure and the behavior of the log-likelihood ratios is also developed. Moreover, we present a scheduling algorithm for decoding LDPC codes in block-fading channels. Simulations show that the proposed techniques result in significant gains in terms of BER for both block-fading and fast-fading channels.

• 出版日期2016-4