Sum rate maximization for multi-cell downlink OFDMA with subcarrier pair-based opportunistic DF relaying

Jin, Zhiwen; Wang, Tao; Wei, Jibo; Vandendorpe, Luc

doi:10.1186/1687-1499-2014-24

Cited by 2 publications

(2 citation statements)

References 41 publications

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“…Let

h_{sd, i}

h_{sr, i}

and

h_{rd, i}

be the channel coefficients of

normalS false\to normalD

normalS false\to normalR

and

normalR false\to normalD

links on subcarrier i , respectively. It's called a subcarrier pair ( i , j ) if subcarrier i in the first phase matches with subcarrier j in the second phase [14]. The destination uses the maximum ratio combining technique to combine signals from the source and the relay and the achievable rate in relay mode for our improved DF protocol is given by

\begin{matrix} right left right left right left right left right left right left0.278em 2em 0.278em 2em 0.278em 2em 0.278em 2em 0.278em 2em 0.278em3pt \\ r_{i, j} & = \frac{1}{2} \min [\ln (1 + p_{s, i} a_{i}), \\ \ln (1 + p_{s, i} c_{i} + {()(, \sqrt{p_{s, j} c_{j}} + \sqrt{p_{r, j} b_{j}})}^{2})] \end{matrix}

For the sake of brevity,

a_{i} = {|h_{sr, i}|}^{2} / N_{0}

b_{j} = {|h_{rd, j}|}^{2} / N_{0}

and

c_{i} = {|h_{sd, i}|}^{2} / N_{0}

, where

N_{0}

is noise variance.…”

Section: System Modelmentioning

confidence: 99%

Resource allocation for OFDM‐based improved DF relaying

2017

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“…Let

h_{sd, i}

h_{sr, i}

and

h_{rd, i}

be the channel coefficients of

normalS false\to normalD

normalS false\to normalR

and

normalR false\to normalD

\begin{matrix} right left right left right left right left right left right left0.278em 2em 0.278em 2em 0.278em 2em 0.278em 2em 0.278em 2em 0.278em3pt \\ r_{i, j} & = \frac{1}{2} \min [\ln (1 + p_{s, i} a_{i}), \\ \ln (1 + p_{s, i} c_{i} + {()(, \sqrt{p_{s, j} c_{j}} + \sqrt{p_{r, j} b_{j}})}^{2})] \end{matrix}

For the sake of brevity,

a_{i} = {|h_{sr, i}|}^{2} / N_{0}

b_{j} = {|h_{rd, j}|}^{2} / N_{0}

and

c_{i} = {|h_{sd, i}|}^{2} / N_{0}

, where

N_{0}

is noise variance.…”

Section: System Modelmentioning

confidence: 99%

Resource allocation for OFDM‐based improved DF relaying

2017

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“…However, if the denominator can be approximated by a monomial, then the objective function satisfies the GP standard form. Condensation rule is adopted to perform the approximation process. The steps of condensation rule are as follows: Input a posynomial

g (x) = \sum_{i} u_{i} (x)

to be approximated and an initial value x 0 ; Evaluate g ( x 0 ); Compute the weight for each term of the posynomial:

α_{i} = \frac{u_{i} (x_{0})}{g (x_{0})};

Condense g ( x ) into a monomial

\overset{g}{true} (x)

\tilde{g} (x) = \prod_{i} {(\frac{u_{i} (x)}{α_{i}})}^{α_{i}};

Get the condensed monomial

\overset{g}{true} (x)

. …”

Section: Power Allocation Schemementioning

confidence: 99%

Increasing secret key capacity of OFDM systems: a geometric program approach

Cheng

Zhou

et al. 2016

Concurrency and Computation

Self Cite

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Extracting secret keys from the common randomness of wireless channels has attracted prominent attention recently. Orthogonal frequency-division multiplexing (OFDM) systems can provide extra randomness in view of the use of multiple subchannels. So far, the secret key capacity of OFDM systems is still an open issue. In this paper, the secret key capacity of OFDM systems based on the subchannel state information is analyzed, and an expression of the secret key capacity is derived under the assumption that the subchannels are independent. To increase the secret key capacity, a power allocation scheme based on geometric program is proposed. Furthermore, an underlying propagation protocol is designed to realize the power allocation scheme. Performance simulations show that the proposed scheme achieves greater secret key capacity in comparison with equal power allocation scheme, especially at low signal-to-noise ratio region. Besides, the secret key bits mismatch rate during the secret key generation based on the power allocated subchannels is decreased.

show abstract

Sum rate maximization for multi-cell downlink OFDMA with subcarrier pair-based opportunistic DF relaying

Cited by 2 publications

References 41 publications

Resource allocation for OFDM‐based improved DF relaying

Resource allocation for OFDM‐based improved DF relaying

Increasing secret key capacity of OFDM systems: a geometric program approach

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