Inter-carrier interference-free Alamouti-coded OFDM for cooperative systems with frequency offsets in non-selective fading environments

Choi, Kwonhue

doi:10.1049/iet-com.2011.0131

Cited by 15 publications

(19 citation statements)

References 20 publications

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“…Moreover, we could see that the equivalent channel gain in every subcarrier is only quantised by 4 bit, the performance gap between RAPFQF + PRSA (4 bit quantisation) and ORA with full feedback is very small. Table 1 [1,3,1,3] in all cases. Therefore, RAPFQF + PRSA could satisfy the constraint condition of the proportional fair very well.…”

Section: Simulation Resultsmentioning

confidence: 96%

“…Fig. 9 depicts the relationship between the average throughput Moreover, the proportional fairness weights for mobile users are [1,3,1,3]. In Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Therefore, the resource allocation technology of wireless network becomes the hot research field to alleviate the contradiction. Because orthogonal frequency division multiplexing access (OFDMA) has distinct advantages, it becomes a promising technique for the next generation of wireless communication systems and provides flexible freedoms for resource allocation [1][2][3]. In this work, we study the resource allocation problem for multiuser OFDMA system.…”

Section: Introductionmentioning

confidence: 99%

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Proportional fairness resource allocation scheme based on quantised feedback for multiuser orthogonal frequency division multiplexing system

Yang

et al. 2014

IET Communications

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This work addresses the resource allocation problem with the proportional fair constraint condition based on quantised feedback for multiuser orthogonal frequency division multiplexing access system. The resource allocation problem is converted as an optimisation problem with maximising the lower bound of the total average throughput and this formulation provides the low complexity of solving the above resource allocation problem. Tailored for the above optimisation problem, the authors design the codebook of equivalent channel quantisation threshold and the codebook of power and rate according to the equal probability quantiser and the Lagrange multiplier method, respectively. Further, they develop a suboptimal algorithm based on the stochastic approximate method. The proposed algorithm not only satisfies the constraint condition of the proportional fair very well, but also reduces the feedback overhead of the resource allocation result greatly. Moreover, the average throughput of the proposed algorithm is very close to that of the optimal resource allocation algorithm with full feedback when the equivalent channel gain in every subcarrier is quantised by 4 bit.

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Section: Simulation Resultsmentioning

confidence: 96%

“…Fig. 9 depicts the relationship between the average throughput Moreover, the proportional fairness weights for mobile users are [1,3,1,3]. In Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Proportional fairness resource allocation scheme based on quantised feedback for multiuser orthogonal frequency division multiplexing system

Yang

et al. 2014

IET Communications

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“…We consider the distributed antenna system that is composed of two TX antennas and one RX antenna. In each TX antenna, OFDM-modulated signals are transmitted with N total subcarriers, as in [1][2][3][4][5][6]. Let the variable x b,l denote the lth data symbol of the bth subblock and the variables X b,k denote the Alamouti-coded symbols at the kth subcarrier of bth subblock of TX antennas A and B, respectively.…”

Section: The System Model and The Ofdm Symbol Structure Of Fadac-ofdmmentioning

confidence: 99%

“…One of the main challenging issues in this area is to mitigate self-interference due to the carrier frequency offset (CFO) between the distributed transmit antennas [1][2][3][4][5][6][7][8]. Very recently in [4], the so-called FADAC-OFDM (frequency-asynchronous distributed Alamouti-coded OFDM) has been proposed and shown to outperform the other existing approaches in [3][4][5]. In contrast to the conventional distributed Alamouti-coded OFDM, FADAC-OFDM is free from ICI (intercarrier interference) terms from the near subcarriers due to its ICI self-cancelation property only by simple Alamouti-decoding process.…”

Section: Introductionmentioning

confidence: 99%

Iterative detection for frequency-asynchronous distributed Alamouti-coded (FADAC) OFDM

Kim

Choi

2017

J Wireless Com Network

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We propose a near intercarrier interference (ICI)-free and very low complexity iterative detector for frequency-asynchronous distributed Alamouti-coded (FADAC) orthogonal frequency division multiplexing (OFDM). In the previous cancelation schemes, the entire subcarrier signals from one transmit (TX) antenna are estimated and canceled in the received signal from the other TX antenna and vice versa. However, the reliability of the estimated symbols are revealed to significantly vary across the subcarriers and thus, the poorly estimated symbols lead to the incorrect cancelation. Motivated from this, we first propose a scheme which does not cancel the interfering subcarrier(s) at the half band edges which undergo very high interference in FADAC-OFDM. For further improvement, we propose a so-called selective scheme which instantly measures the reliability of the detected symbols at each iteration and then exclude the unreliable symbols in the estimated interference generation. Moreover, the proposed scheme has a drastically reduced complexity by converting the cancelation process from the subcarrier domain to the time domain. In accordance with the analysis on the considered reliability measures, the numerical results show that the proposed scheme achieves the near ICI-free level only within three or four iterations for wide ranges of SNR, frequency offset, and delay spread.

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Semi‐analytic selection of sub‐carrier allocation schemes in uplink orthogonal frequency division multiple access

Choi

2013

IET Communications

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Inter-carrier interference-free Alamouti-coded OFDM for cooperative systems with frequency offsets in non-selective fading environments

Cited by 15 publications

References 20 publications

Proportional fairness resource allocation scheme based on quantised feedback for multiuser orthogonal frequency division multiplexing system

Proportional fairness resource allocation scheme based on quantised feedback for multiuser orthogonal frequency division multiplexing system

Iterative detection for frequency-asynchronous distributed Alamouti-coded (FADAC) OFDM

Semi‐analytic selection of sub‐carrier allocation schemes in uplink orthogonal frequency division multiple access

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