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This paper proposes a parallel double Gray mapping scheme that is suited to circular quadrature amplitude modulation (QAM) constellations using partial channel coding associated with collaborative decoding. Using the proposed scheme, We compare the bit error rate (BER) performance of circular 1024QAM and 2048QAM schemes to that of rectangular 1024QAM and cross 2048QAM schemes, respectively. Computer...
This paper compares the block error rate (BLER) performance of open-loop (OL) transmit diversity schemes with four antennas in the uplink for discrete Fourier transform (DFT)-precoded orthogonal frequency division multiple access (OFDMA). One candidate is a quasi-orthogonal (QO) - space-time block code (STBC) in which four-branch minimum mean-square error combining (MMSEC) is achieved at the cost...
This paper proposes using iterative decision-feedback channel estimation (DFCE) in a turbo soft interference canceller (SIC) for a quasi-orthogonal (QO) - space-time block code (STBC) with four antennas in discrete Fourier transform (DFT)-precoded orthogonal frequency division multiple access (OFDMA). In the proposed method, channel estimation (CE) is updated at each turbo SIC iteration loop by using...
Transmit diversity associated with receiver diversity is very effective in improving the bit error rate or block error rate (BLER) performance as a Rank-1 transmission scheme. However, it is not easy to rely on theoretical analysis to analyze transmit and receiver diversity gains considering channel coding, frequency diversity through a wider transmission bandwidth, and channel estimation error in...
This paper proposes applying intra-subframe frequency hopping (FH) to closed-loop (CL) type transmit diversity using codebook based precoding for a shared channel carrying user traffic data in the uplink discrete Fourier transform (DFT)-precoded Orthogonal Frequency Division Multiple Access (OFDMA). In the paper, we present two types of precoding schemes associated with intra-subframe FH: individual...
This paper proposes a combination of open-loop (OL) transmit diversity and intra-subframe frequency hopping (FH) for a shared channel carrying user traffic data and investigates the potential performance of the combination compared to closed-loop (CL) transmit diversity for uplink discrete Fourier transform (DFT)-precoded OFDMA in frequency-selective fading channels. We apply FH to OL transmit diversity...
This paper presents performance comparisons based on the block error rate (BLER) of open-loop transmit diversity schemes considering a cubic metric (CM) for discrete Fourier transform (DFT)-Precoded orthogonal frequency division multiple access (OFDMA) in uplink frequency-selective fading channels. The open-loop transmit diversity schemes assumed in the paper are space-time block code (STBC), space-frequency...
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