Adaptive Modulation with Diversity Combining Based on Output-Threshold MRC

Ko, Young-Chai; Yang, Hong-Chuan; Eom, Seung-Sik; Alouini, Mohamed‐Slim

doi:10.1109/twc.2007.060090

Cited by 47 publications

(31 citation statements)

References 13 publications

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“…In case that multiple users scheduling is needed in the region of high γ, the system needs to select the number of scheduled users carefully by considering a system capacity requirement and a channel status. In the region of low γ, the ASE of the scheduled users with conventional adaptive modulation [10,[14][15][16][17][18][19] is decreasing and finally becomes zero due to the discrete nature of adaptive modulation. Note that the SINRs of the scheduled users is decreasing and finally saturated as K s increases (but these values are almost constant although these values are changing) and almost of these values are very small compared with the minimum threshold of a conventional adaptive modulation.…”

Section: Numerical Examplesmentioning

confidence: 99%

Impact of Interference on the Performance of Selection Based Parallel Multiuser Scheduling

Nam

Yang

Alouini

et al. 2012

IEEE Trans. Wireless Commun.

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In this paper, we investigate the impact of interference on the performance of selection based parallel multiuser scheduling. In conventional parallel multiuser scheduling schemes, every scheduled user is interfering with every other scheduled user. This is a factor which limits the capacity and performance of multiuser systems and the level of interference becomes substantial as the number of scheduled users increases. Based on the above motivation, we investigate the trade-off between the throughput and the number of scheduled users. The major difficulty in the total average sum rate capacity and the average spectral efficiency (ASE) analysis resides in the determination of the statistics of the Signal to Interference plus Noise Ration (SINR) of the scheduled user. Fortunately, we could derive the accurate statistical characterization of the SINR of the scheduled user. With these accurate statistical analysis, we derive the total average sum rate capacity and the average spectral efficiency based on the SINR. Based on the ASE and the total average sum rate capacity analysis, we investigate the trade-off between the throughput and the number of scheduled users. Hence, based on these results, the system should carefully select the appropriate number of scheduled users to maximize the overall throughput while maintaining an acceptable quality of service given certain channel conditions.

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Section: Numerical Examplesmentioning

confidence: 99%

Impact of Interference on the Performance of Selection Based Parallel Multiuser Scheduling

Nam

Yang

Alouini

et al. 2012

IEEE Trans. Wireless Commun.

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“…and Λሺxሻ ൌ ൜ 0, x 0; 1/2, x ൏ 0, (8) Finally, noting that due to Rayleigh fading, the instantaneous SNR, γ ୱ , of the feedback channel is a random variable, we can obtain the mode transition probability, q n,j , by averaging over its distribution as…”

Section: Feedback Error and Its Quantificationmentioning

confidence: 99%

“…First, we consider adaptive modulation and diversity combining (AMDC) schemes in [7], [8]. With this scheme, the receiver jointly decides the proper modulation mode and diversity combiner structure based on the channel quality and the target error rate requirement.…”

Section: Application To Amdc Schemementioning

confidence: 99%

Feedback Error Quantification in Adaptive Modulation over Fading Channels

Choi¹

2011

Journal of information and communication convergence engineerin

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Abstract-In this work, we consider imperfectness of feedback channels in the adaptive transmission scheme which was previously studied with an assumption of errorfree feedback channels. New method of mapping the modulation index into the feedback channel symbols and quantifying feedback error over fading channels are proposed. The presented method and results are expected to offer valuable tools for the system designer to efficiently implement adaptive diversity schemes to compensate for the performance degradation due to feedback error.

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“…Yang et al [11] combined adaptive modulation with Generalized Selective Combining (GSC) under the terminology of joint adaptive modulation and diversity combining. This work was then carried on in [12,13]. Aniba and Aissa [9] discussed adaptive modulation in conjunction with packet combining and truncated ARQ for transmission over MIMO Nakagami fading channels.…”

Section: Introductionmentioning

confidence: 99%

Maximum Throughput Adaptive Rate Transmission scheme for multihop diversity aided multihop links

Dong

Yang

Zuo

et al. 2014

2014 IEEE International Conference on Communications (ICC)

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Abstract-In multihop diversity aided multihop links, the number of bits transmitted in each Time Slot (TS) is affected by both the Channel Quality (CQ) and the Buffer Fullness (BF), when adaptive modulation is employed. We assume that every node has buffers for temporarily storing its received packets for further transmission at instances of good CQ. For the sake of improving the throughput, a Maximum Throughput Adaptive Rate Transmission (MTART) scheme was proposed, where the specific hop having the capability of transmitting the highest number of bits (packets) will be activated. If more than one hops are capable of transmitting the same number of bits, the particular hop having the highest CQ (reliability) is activated. We demonstrate that the MTART scheme has 8 dB gain at the Outage Probability (OP) of 10 −3 and has 3 dB gain in terms of the throughput attained in comparison to the conventional adaptive modulation aided scheme.

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Adaptive Modulation with Diversity Combining Based on Output-Threshold MRC

Cited by 47 publications

References 13 publications

Impact of Interference on the Performance of Selection Based Parallel Multiuser Scheduling

Impact of Interference on the Performance of Selection Based Parallel Multiuser Scheduling

Feedback Error Quantification in Adaptive Modulation over Fading Channels

Maximum Throughput Adaptive Rate Transmission scheme for multihop diversity aided multihop links

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