Performance analysis of a time diversity ARQ in land mobile radio

Adachi, Fumiyuki; Ito, Sayuri; Ohno, K.

doi:10.1109/26.20086

Cited by 23 publications

(8 citation statements)

References 12 publications

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“…Finally, the total probability of error for the truncated type-II hybrid ARQ scheme with is (13) where we have used the upper bounding defined in (8). We can clearly see that the reliability of the truncated ARQ schemes does not depend on the quality of the feedback channel: the noisy feedback only increases the average number of transmissions but does not affect the error probabilities.…”

Section: Reliabilitymentioning

confidence: 97%

“…A truncated type-II hybrid ARQ scheme using block codes and only one retransmission was studied in [12] over an ideally interleaved Nakagami fading channel. In [13], a time-diversity ARQ scheme (pure ARQ with packet combining) employing a limited number of transmissions was analyzed. The numerical results were presented for MSK over a block fading channel.…”

Section: Introductionmentioning

confidence: 99%

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Performance of truncated type-II hybrid ARQ schemes with noisy feedback over block fading channels

Malkamaki

Leib

2000

IEEE Trans. Commun.

152

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This paper considers truncated type-II hybrid automatic repeat-request (ARQ) schemes with noisy feedback over block fading channels. With these ARQ techniques, the number of retransmissions is limited, and, similar to forward error correction (FEC), error-free delivery of data packets cannot be guaranteed. Bounds on the average number of transmissions, the average coding rate as well as the reliability of the schemes are derived using random coding techniques, and the performance is compared with FEC. The random coding bounds reveal the achievable performance with block codes and maximum-likelihood soft-decision decoding. Union upper bounds and simulation results show that over block fading channels, these bounds can be closely approached with simple terminated convolutional codes and soft-decision Viterbi decoding. Truncated type-II hybrid ARQ and the corresponding FEC schemes have the same probability of packet erasure; however, the truncated ARQ schemes offer a trade-off between the average coding rate and the probability of undetected error. Truncated ARQ schemes have significantly higher average coding rates than FEC at high and medium signal-to-noise ratio even with noisy feedback. Truncated ARQ can be viewed as adaptive FEC that adapts to the instantaneous channel conditions. Index Terms-Block fading channel, error control, noisy feedback, random coding bound, truncated ARQ, union bound.

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Section: Reliabilitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Performance of truncated type-II hybrid ARQ schemes with noisy feedback over block fading channels

Malkamaki

Leib

2000

IEEE Trans. Commun.

152

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“…HARQ has been extensively studied in the literature, for instance in [5]- [8]. However, to our knowledge, none of these has addressed the issue of non-ideal channel estimation.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of HARQ in WiMAX Networks Considering Imperfect Channel Estimation

Dias¹,

Leite²,

Amorim

et al. 2010

Anais De VII International Telecommunications Symposium

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Hybrid Automatic Repeat Query (HARQ) is an error correction technique that has become an integral part of most current broadband wireless standards such as IEEE 802.16 and 3GPP-LTE (Long Term Evolution). Although extensive studies have been made on the performance of HARQ, they usually assume perfect channel state information at the receiver. This paper addresses the performance of incremental redundancy HARQ under the specifications of the physical layer of the WiMAX standard considering imperfect channel state information, such as the one obtained by channel estimation. Several combinations of modulation, channel code rates and information block size are considered, and a realistic physical channel model used for standardization is used throughout the simulations to evaluate the performance of HARQ. Results show that the link throughput can be severely degraded, specifically at low values of signal-to-noise ratio, and HARQ performance may be too optimistic if channel estimation is ignored.

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“…Combined use of present and previously received packets forms a lower rate code. Code combing [9] or time diversity (TD) combining [10] is also utilized. The computer simulated performance of spread type-II hybrid RCPT ARQ in a four-path (L=4) frequency selective Rayleigh channel is plotted in Fig.…”

Section: Ds-cdma Approachmentioning

confidence: 99%