Optimal Pilot Symbol Power Allocation in LTE

Šimko, Michal; Pendl, Stefan; Schwarz, Štefan; Wang, Qi; Ikuno, Josep Colom; Rupp, Markus

doi:10.1109/vetecf.2011.6092929

Cited by 23 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [1], the authors derived the optimal power distribution between pilot and data symbols for time-invariant channels under imperfect channel knowledge. The optimal distribution of power turned out to be independent of the SNR and channel realizations.…”

Section: Related Studymentioning

confidence: 99%

“…Note that due to Equation (8), it can be shown [1] that the MSE of the LS channel estimator at the pilot symbol positions is identical to the noise power σ 2 n for time-invariant channels. In the case of time-variant channels, we have to consider also the ICI power.…”

Section: Ls Channel Estimationmentioning

confidence: 99%

“…It is the same as in [1], only the constant c e has a different value due to the distinct performance of the channel estimators. Let us focus on the termd in Equation (44).…”

Section: Power Allocationmentioning

confidence: 99%

“…Some standards, e.g., LTE, allow to assign different power levels to the data and pilot subcarriers, which makes room for system optimization. A power increase at the pilot subcarriers results in a more reliable channel estimate [1] which implies higher throughput; however, the power available for the data subcarriers is decreased given a constant sum power constraint. Therefore, it is necessary to find an optimal power allocation between the pilot and data subcarriers which delivers a maximized system performance.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimal pilot symbol power allocation under time-variant channels

Šimko¹,

Wang²,

Rupp³

2012

J Wireless Com Network

Self Cite

View full text Add to dashboard Cite

Nowadays, most wireless communication systems employ coherent demodulation on the receiver side. Under this circumstance, part of the available transmission resource is reserved and utilized for channel estimation, referred to as pilot symbols. In recent standards, for example long-term evolution (LTE), a certain adjustment is allowed for the power radiated on the pilot symbols. This additional degree of freedom creates space for a further optimization of the system performance. In this article, we consider an orthogonal frequency division multiplexing system and investigate how to distribute the available power between data symbols and pilot symbols under transmissions over time-variant channels so that the overall throughput is maximized. We choose the post-equalization signal-to-interference and noise ratio as the cost function and solve the problem analytically. Simulation results obtained by the Vienna LTE simulator are consistent with the analytical results. With an optimal power distribution between data and pilot symbols, a throughput increase of around 10% can be achieved compared to a system with evenly distributed power between data and pilot symbols.

show abstract

Section: Related Studymentioning

confidence: 99%

Section: Ls Channel Estimationmentioning

confidence: 99%

“…It is the same as in [1], only the constant c e has a different value due to the distinct performance of the channel estimators. Let us focus on the termd in Equation (44).…”

Section: Power Allocationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimal pilot symbol power allocation under time-variant channels

Šimko¹,

Wang²,

Rupp³

2012

J Wireless Com Network

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the following, we extend Equation (8) to a N R × N T Multiple-Input Multiple-Output (MIMO) case. The transfer functions A (m,q) and B (m,q) from Transmitter (TX) q to Receiver (RX) m are constructed using the corresponding channel coefficients h (m,q) n .…”

Section: System Modelmentioning

confidence: 99%

Performance analysis of LTE downlink under Symbol Timing Offset

Wang¹,

Šimko²,

Rupp³

2012

2012 International ITG Workshop on Smart Antennas (WSA)

Self Cite

View full text Add to dashboard Cite

In this paper, we evaluate the performance of a standardized OFDM system, namely Long Term Evolution (LTE) downlink, with imperfect symbol timing. A closed form expression of the post-equalization Signal to Interference and Noise Ratio (SINR) is derived and compared with results obtained from a standard compliant simulator. Also, we analyzed the channel estimation performance when Symbol Timing Offset (STO) occurs. This work reveals the impact of imperfect synchronization on the link performance. It also allows an accurate and realistic modeling of the physical layer behavior, which can be applied to reproduce results from time-consuming link level simulations.

show abstract

Optimal Pilot Pattern for Downlink Transmissions

Šimko

2016

The Vienna LTE-Advanced Simulators

View full text Add to dashboard Cite

Optimal Pilot Symbol Power Allocation in LTE

Cited by 23 publications

References 10 publications

Optimal pilot symbol power allocation under time-variant channels

Optimal pilot symbol power allocation under time-variant channels

Performance analysis of LTE downlink under Symbol Timing Offset

Optimal Pilot Pattern for Downlink Transmissions

Contact Info

Product

Resources

About