On the outage and diversity-multiplexing tradeoff of broadcast channels with 1-bit feedback

Niu, Bo; Haimovich, Alexander M.

doi:10.1109/icassp.2010.5496000

Cited by 2 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Φ(t) ≡ t −∞ dx(2π) −1/2 exp(−x 2 /2). Therefore, plugging (35) in (11), we easily obtain the limit we set out to prove.…”

Section: Discussionmentioning

confidence: 99%

“…The results above are achieved with a short-term average power allocation assumption, and the base station transmits with the same power to the chosen user regardless the feedback bits (P 1 = P 0 = P ). Inspired by [26]- [28], where the DMT of a point-to-point communication with limited feedback CSI and long-term power allocation is discussed, we investigate the outage performance for a 1-bit feedback scheme with long-term average power allocation in this section, and analyze how power allocation improves the DMT in the multiuser scenario [35]. By long-term average power allocation, different power P 1 or P 0 is adaptively allocated to the chosen user during each of the fading blocks, according to the CSI feedback bits from all users.…”

Section: Outage Performance Of the 1-bit Feedback Schemementioning

confidence: 99%

See 1 more Smart Citation

Ergodic and Outage Performance of Fading Broadcast Channels with 1-Bit Feedback

Niu¹,

Simeone²,

Somekh³

et al. 2010

Preprint

Self Cite

View full text Add to dashboard Cite

In this paper, the ergodic sum-rate and outage probability of a downlink single-antenna channel with K users are analyzed in the presence of Rayleigh flat fading, where limited channel state information (CSI) feedback is assumed. Specifically, only 1-bit feedback per fading block per user is available at the base station. We first study the ergodic sumrate of the 1-bit feedback scheme, and consider the impact of feedback delay on the system. A closed-form expression for the achievable ergodic sum-rate is presented as a function of the fading temporal correlation coefficient. It is proved that the sumrate scales as log log K, which is the same scaling law achieved by the optimal non-delayed full CSI feedback scheme. The sumrate degradation due to outdated CSI is also evaluated in the asymptotic regimes of either large K or low SNR. The outage performance of the 1-bit feedback scheme for both instantaneous and outdated feedback is then investigated. Expressions for the outage probabilities are derived, along with the corresponding diversity-multiplexing tradeoffs (DMT). It is shown that with instantaneous feedback, a power allocation based on the feedback bits enables to double the DMT compared to the case with shortterm power constraint in which a dynamic power allocation is not allowed. But, with outdated feedback, the advantage of power allocation is lost, and the DMT reverts to that achievable with no CSI feedback. Nevertheless, for finite SNR, improvement in terms of outage probability can still be obtained.

show abstract

“…where Φ(t) ≡ t −∞ dx(2π) −1/2 exp(−x 2 /2). Therefore, plugging (35) in (11), we easily obtain the limit we set out to prove.…”

Section: Discussionmentioning

confidence: 99%

Section: Outage Performance Of the 1-bit Feedback Schemementioning

confidence: 99%