Combined Effect of Transmit Diversity and Frequency Hopping for DFT-Precoded OFDMA in Uplink Frequency-Selective Fading Channels

Deng, Lianjun; Kawamura, Teruo; Taoka, Hidekazu; Sawahashi, Mamoru

doi:10.1109/vetecs.2011.5956765

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…T FB is set to 0 or 8 msec. For comparison, the performance with STBC without intra-subframe FH and that for STBC employing intra-subframe FH and decision-feedback channel estimation (DFCE), which we proposed in [11], are given in the figure. In the DFCE, an accurate channel impulse response is estimated using a soft-symbol replica based on LLR at the Max-Log-MAP decoder output in addition to the RS. DFCE is applied to precoding Tx diversity as well for fair comparison.…”

Section: A Tracking Performance Of CL Type Transmit Diversity With Pmentioning

confidence: 99%

Effect of Intra-Subframe Frequency Hopping on Closed-Loop Type Transmit Diversity with Precoding for Uplink DFT-Precoded OFDMA

Deng

Kawamura²,

Taoka³

et al. 2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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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 precoding vector selection between 2 slots where a 1-msec subframe comprises 2 slots among the reduced precoding codebooks, and common precoding vector selection between 2 slots. We investigate the effect of intra-subframe FH on the CL type transmit diversity with precoding in terms of the block error rate (BLER) performance while maintaining the same number of feedback bits required for notification of the selected precoding vector as that for CL type precoding based transmit diversity without FH. Computer simulation results show that CL type transmit diversity with precoding using intra-subframe FH is very effective in reducing the required average received signal-to-noise power ratio (SNR) when the fading maximum Doppler frequency, f D , is higher than approximately 50 Hz both for 2-and 4-antenna transmission in the uplink DFT-precoded OFDMA.

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Section: A Tracking Performance Of CL Type Transmit Diversity With Pmentioning

confidence: 99%

Effect of Intra-Subframe Frequency Hopping on Closed-Loop Type Transmit Diversity with Precoding for Uplink DFT-Precoded OFDMA

Deng

Kawamura²,

Taoka³

et al. 2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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“…Accordingly, OL transmit diversity is not adopted in the LTE-Advanced uplink. We proposed the application of decision-feedback channel estimation (DFCE) and intra-subframe frequency hopping (FH) to space-time block code (STBC) or SFBC to mitigate the performance loss due to channel estimation error particularly in correlated channels [10]. As aforementioned, the maximum number of antennas supported in the LTE-Advanced user equipment (UE) is eight.…”

Section: Introductionmentioning

confidence: 99%

Investigation on transmit and receiver diversity gains considering channel estimation error for uplink DFT-precoded OFDMA

Deng

Kawamura

Taoka

et al. 2011

2011 International Conference on Wireless Communications and Signal Processing (WCSP)

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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 Discrete Fourier Transform (DFT)-precoded Orthogonal Frequency Division Multiple Access (OFDMA) using a frequency domain equalizer (FDE). Therefore, this paper investigates the gains of transmit diversity and receiver diversity considering channel estimation error for uplink DFT-precoded OFDMA. More specifically, we clarify the gains from open-loop (OL) transmit diversity using space-time block code (STBC) based coding and closed-loop (CL) transmit diversity with codebook based precoding at a set of user equipment (UE) assuming receiver diversity with the maximum of 12 antennas at a base station (BS) based on link-level computer simulations. Then, we clarify the numbers of transmit and receiver diversity branches, which provide distinct gains in terms of the BLER improvement.

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Combined Effect of Transmit Diversity and Frequency Hopping for DFT-Precoded OFDMA in Uplink Frequency-Selective Fading Channels

Cited by 2 publications

References 7 publications

Effect of Intra-Subframe Frequency Hopping on Closed-Loop Type Transmit Diversity with Precoding for Uplink DFT-Precoded OFDMA

Effect of Intra-Subframe Frequency Hopping on Closed-Loop Type Transmit Diversity with Precoding for Uplink DFT-Precoded OFDMA

Investigation on transmit and receiver diversity gains considering channel estimation error for uplink DFT-precoded OFDMA

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