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When signal-to-noise ratio (SNR) is low, the performance of unitary space-time modulation (USTM) is unsatisfactory. A novel scheme employing unitary space-time symbol-based turbo code (UST-SB-TC) can greatly reduce the time delay but its MAP decoding algorithm may cause the system instability. As we know, Log-MAP algorithm needs exponential processing and Max-Log-MAP would inevitably result in performance...
Unitary space-time modulation (USTM) is ideally suited for time independent rapid fading channels because it can work well without channel state information (CSI). In reality the fading coefficients are always correlated, in which condition differential unitary space-time modulation (DUSTM) was proposed. However, it also meets with the too high bit error rate (BER) problem when the signal-to-noise...
Unitary space-time (UST) symbol-based turbo code has recently been proposed which can reduce the system complexity and calculation amount compared with bit-wise concatenation scheme. However, the corresponding maximum a posteriori (MAP) decoding algorithm still makes hardware unbearable and later its simplified versions, max-log-MAP and log-MAP algorithms, appeared. In this paper, we propose a multi-ary...
UST symbol-based turbo code has recently been proposed which can reduce the system complexity and calculation amount compared with bit-wise concatenation scheme. However, the corresponding MAP decoding algorithm still makes hardware unbearable and later its simplified versions, Max-Log-MAP and Log-MAP algorithms, appeared. In this paper, we propose a multiary SOVA decoding algorithm for UST symbol-based...
Recently, a novel scheme employing unitary space-time symbol based turbo code (USTSBTC) has been proposed that can greatly reduce the system complexity while maintaining a fairly well performance compared with the bit wise processing version. However, as we know, an intrinsic pitfall of MAP decoding algorithm for turbo code is its too large amount storage requirement. We propose a sliding window for...
An intrinsic pitfall of unitary space-time modulation is that its performance is unsatisfactory at low signal-to-noise ratio. Concatenating it with turbo code is a possible solution, however, bit wise processing results in unacceptable calculation mount. A novel scheme employing unitary space-time symbol base turbo code can greatly reduce the time delay but its MAP decoding algorithm may lead to system...
We propose a scheme of utilizing unitary space-time symbol based nonbinary turbo code (USTSBTC) for wireless communication systems with multiple antennas over extremely fast Rayleigh block fading channels, where no channel state information (CSI) is available. We give an effective way of applying USTSBTC as an alternative to the original unitary space-time modulation and present an effective unitary...
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