Adaptive Feedback Scheme on K-Cell MISO Interfering Broadcast Channel with Limited Feedback

Lee, Namyoon; Shin, Wonjae

doi:10.1109/twc.2010.112310.100543

Cited by 62 publications

(109 citation statements)

References 12 publications

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“…For the simulations, the parameters are chosen as N t = 4, R = 1 km, and α = 3.7. The performance results of the proposed bit partitioning schemes are compared with the performance of equal sharing PZF (PZF-EQ), MRC beamforming, and the bit partitioning algorithm in [12]. The PZF-EQ beamforming shares the quantized bits among serving and interfering BSs equally and always performs ICI, while MRC beamforming allocates all bits to quantize CQI of the serving BS and does not perform ICI.…”

Section: Performance Resultsmentioning

confidence: 99%

“…The adaptive bit partitioning for delayed limited feedback channels has been presented by allocating more bits to quantize stronger channels with smaller delays and fewer bits to weaker channels with larger delays in [11]. Adaptive feedback schemes for coordinated zero forcing have been investigated by minimizing expected quantization error to maintain optimal multiplexing gain in [12]. Limited feedback schemes with channel quantization for cooperative multicell processing (CoMP) have been examined in [13] including CoMP channel reconstruction, CoMP codebook generation, and per-cell codeword selection.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive limited feedback links for cooperative multi-antenna multicell networks

Özbek

Ruyet

2014

J Wireless Com Network

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The overall performance of cooperative networks is quite sensitive to channel state information (CSI) of serving and interfering base stations (BSs) and affected strongly by quality of limited feedback links. In this paper, we propose two adaptive limited feedback strategies for intercell interference cancelation in multi-antenna multicell networks. The first proposed strategy is developed to improve average multicell capacity assuming a fixed rate feedback link. This algorithm is based on adaptation of the number of bits to quantize CSI of serving and interfering BSs according to transmitter power and location of the user in its own cell. The second proposed strategy is designed in a way to increase average capacity of cell-edge users assuming an adaptive rate feedback link. This algorithm is based on the idea of allocating more bits to quantize CSI of users at cell-edge regions while allocating less bits for users near the serving BS. We illustrate performance of the proposed feedback links for downlink cooperative multi-antenna multicell networks in wireless channels.

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Section: Performance Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive limited feedback links for cooperative multi-antenna multicell networks

Özbek

Ruyet

2014

J Wireless Com Network

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“…Consider a cluster of N b BSs each equipped with N t antennas to cooperatively serve K single antenna users in each cell with CoMP-CB [6].…”

Section: Signal Modelmentioning

confidence: 99%

“…The relation between the perfect CDI and quantized CDI can be modeled as [9] [8], whose value depends on the employed codebooks, which is intractable for analysis. We therefore consider a quantization cell approximation method used in [9], whose average CDI quantization distortion is As in most limited-feedback literature [6,8,19], we consider the zero-forcing beamforming (ZFBF) at the BSs which is low complexity but suboptimal and consider full multiplexing, i.e., N t = N b K, due to its analytic tractability. Extra transmit antennas at the BSs, i.e., N t > N b K, do not necessarily provide higher EE for limited-feedback systems.…”

Section: Limited-feedback Transmission Modelmentioning

confidence: 99%

“…Consequently, we can find that (27) tends to allocate more bits to the cell with larger QoS requirement. By contrast, the bit allocation algorithm for improving SE proposed in [5,6] only exploits the receive powers in the desired and interfering channels but does not consider the different QoS requirements, and thus cannot be applied in this work. , which is a sum of K items coming from the ICI of K users served by the th BS.…”

Section: Proposition 2 the Minimum Total Transmit Power In (22) Satimentioning

confidence: 99%

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Joint power and feedback bit allocation for energy- efficient design in limited-feedback coordinated beamforming systems

Fang

Yang

2015

J Wireless Com Network

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Energy efficiency (EE) has become an important design goal for future cellular systems. In this paper, we study the EE problem for limited-feedback coordinated beamforming systems providing real-time services with constant date rate. To maximize the EE, we jointly optimize the transmit power among users and the feedback bits of each user to quantize the desired and interfering channel directions, subject to the constraints of outage probability and number of feedback bits. An iterative optimization algorithm is proposed for alternating power and bit allocation by employing Yates' framework. To further reduce the computational complexity, a suboptimal algorithm is proposed in closed form by decoupling the problem into subproblems under asymptotical analysis. Simulation results show that the suboptimal algorithm performs closely to the iterative optimization algorithm under high-quantization resolution. Moreover, the proposed two algorithms provide substantial EE gain over existing schemes with equal power and bit allocation, and the EE depends on the target data rate and outage probability of each user as well as the circuit power consumption at the base stations.

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Performance analysis of adaptive limited feedback coordinated zero‐forcing multicell systems in time‐varying channels: A practical approach

Balaji

Mallick

2017

Int J Communication

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In this paper, coordinated limited feedback zero-forcing beamforming multicell system in time-varying channel is studied. In time-varying channels, the actual rate loss arising from error in channel quantization of both interuser and intercell inferences is quantified in this work. Using the actual degradation of rate loss, a limited feedback bit allocation is proposed to reduce interuser and intercell interference simultaneously with feedback update period as one of the parameters. Furthermore, the scaling law of bits required to maintain a constant rate loss is formulated in varying channel conditions for a given feedback update period. Simulation results demonstrated the practical feedback requirement in multicell systems in the presence of both intercell and interuser interference over conventional schemes to maintain a constant rate offset. The key finding from the proposed feedback allocation is that practically much higher allocation of feedback bits and feedback scaling are required in time-varying channels to reduce throughput degradation.

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Adaptive Feedback Scheme on K-Cell MISO Interfering Broadcast Channel with Limited Feedback

Cited by 62 publications

References 12 publications

Adaptive limited feedback links for cooperative multi-antenna multicell networks

Adaptive limited feedback links for cooperative multi-antenna multicell networks

Joint power and feedback bit allocation for energy- efficient design in limited-feedback coordinated beamforming systems

Performance analysis of adaptive limited feedback coordinated zero‐forcing multicell systems in time‐varying channels: A practical approach

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