Does amplify-and-forward cooperative relay improve OFDM/OFDMA ergodic capacity

Wei Huangfu; Zhongshan Zhang; Dandan Zhang; Keping Long

doi:10.1109/CC.2014.6821740

Does amplify-and-forward cooperative relay improve OFDM/OFDMA ergodic capacity

Wei Huangfu, Zhongshan Zhang, Dandan Zhang, Keping Long

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The ergodic information rate for Orthogonal Frequency-Division Multiplexing/Orthogonal Frequency-Division Multiple Access with amplify-and-forward (AF) relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of a (the ratio of the power allocated to the source node and the total transmit power), implying that the maximum ergodic information rate can be obtained at ¿=1 (i.e., there is no cooperative relay). Furthermore, the proof of ¿cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel¿ is also provided in this letter.

Original language	English
Pages (from-to)	83-89
Number of pages	7
Journal	China Communications
Volume	11
Issue number	2
DOIs	https://doi.org/10.1109/CC.2014.6821740
Publication status	Published - Feb 2014
Externally published	Yes

Keywords

Orthogonal Frequency-Division Multiple Access (OFDMA)
Orthogonal Frequency-Division Multiplexing (OFDM)
amplify-and-forward (AF)
cooperation
ergodic information rate
frequency offset

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10.1109/CC.2014.6821740

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title = "Does amplify-and-forward cooperative relay improve OFDM/OFDMA ergodic capacity",

abstract = "The ergodic information rate for Orthogonal Frequency-Division Multiplexing/Orthogonal Frequency-Division Multiple Access with amplify-and-forward (AF) relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of a (the ratio of the power allocated to the source node and the total transmit power), implying that the maximum ergodic information rate can be obtained at ¿=1 (i.e., there is no cooperative relay). Furthermore, the proof of ¿cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel¿ is also provided in this letter.",

keywords = "Orthogonal Frequency-Division Multiple Access (OFDMA), Orthogonal Frequency-Division Multiplexing (OFDM), amplify-and-forward (AF), cooperation, ergodic information rate, frequency offset",

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year = "2014",

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doi = "10.1109/CC.2014.6821740",

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publisher = "China Institute of Communication",

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T1 - Does amplify-and-forward cooperative relay improve OFDM/OFDMA ergodic capacity

AU - Huangfu, Wei

AU - Zhang, Zhongshan

AU - Zhang, Dandan

AU - Long, Keping

PY - 2014/2

Y1 - 2014/2

N2 - The ergodic information rate for Orthogonal Frequency-Division Multiplexing/Orthogonal Frequency-Division Multiple Access with amplify-and-forward (AF) relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of a (the ratio of the power allocated to the source node and the total transmit power), implying that the maximum ergodic information rate can be obtained at ¿=1 (i.e., there is no cooperative relay). Furthermore, the proof of ¿cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel¿ is also provided in this letter.

AB - The ergodic information rate for Orthogonal Frequency-Division Multiplexing/Orthogonal Frequency-Division Multiple Access with amplify-and-forward (AF) relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of a (the ratio of the power allocated to the source node and the total transmit power), implying that the maximum ergodic information rate can be obtained at ¿=1 (i.e., there is no cooperative relay). Furthermore, the proof of ¿cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel¿ is also provided in this letter.

KW - Orthogonal Frequency-Division Multiple Access (OFDMA)

KW - Orthogonal Frequency-Division Multiplexing (OFDM)

KW - amplify-and-forward (AF)

KW - cooperation

KW - ergodic information rate

KW - frequency offset

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JO - China Communications

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ER -

Does amplify-and-forward cooperative relay improve OFDM/OFDMA ergodic capacity

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Keywords

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