Universidade Federal de Juiz de Fora Engenharia Elétrica Programa de Pós-Graduação em Engenharia Elétrica Mateus de Lima Filomeno Cooperative Communication for Broadband PLC and PLC/Wireless Systems: Achievable Data Rate Analyses Juiz de Fora

This dissertation aims to discuss hybrid and non-hybrid cooperative communications applied to in-home broadband data communication systems. In this sense, the two-stage single-relay channel model is investigated for in-home broadband power line communication systems. This cooperative channel model consists of the concatenation of two single-relay channels, covering data communication links with up to two hops. Moreover, a hybrid power line/wireless single-relay channel model is analyzed for broadband data communication systems, considering one-hop links. Ergodic achievable data rate expressions are derived for both hybrid and non-hybrid cooperative channel models in order to compare them. Due to channel and noise characteristics of electric power grids, numerical results are based on a data set constituted by power line channel estimates and additive noise measurements covering the frequency band from 1.7 up to 100 MHz and different relay positions. For wireless channels, the HIPERLAN/2 model with the same bandwidth is used, but at a central frequency of 5 GHz, while the additive noise is considered to be Gaussian white. Regarding only power line communication systems, it is shown that the two-stage single-relay channel model is the best option when the source-to-destination link is severely degraded (e.g., high signal attenuation due to the long distance between source and destination nodes and/or high-power noise presence). When the channel degradation is not severe, the two-hop channel model is more appropriate. Concerning hybrid systems, it is observed that, when the relay is halfway between source and destination nodes, the hybrid single-relay channel model presents the best performance in terms of ergodic achievable data rate, while the hybrid one-hop channel model yields the best results for other cases. Key-words: cooperative communication, hybrid communication, power line communication, wireless communication, ergodic achievable data rate. LIST OF FIGURES Figure 1 – Two-stage single-relay channel model during one symbol time duration. 17 Figure 2 – Adopted configurations from the 2S-SRC model. 18 Figure 3 – Adopted hybrid channel models. 25 Figure 4 – PSD of an additive noise measurement in SD, SR, and RD channels. 33 Figure 5 – β1 × β2 plane used to organize the data set in the four cases . 34 Figure 6 – AF protocol and GSD = −80 dB: Ergodic achievable data rate gain vs total transmission power. 37 Figure 7 – DF protocol and GSD = −80 dB: Ergodic achievable data rate gain vs total transmission power. 39 Figure 8 – AF protocol and ρB/ρE × GSD. 41 Figure 9 – DF protocol and ρB/ρE × GSD. 42 Figure 10 – Without combination: Ergodic achievable data rate gain vs total transmission power. 45 Figure 11 – With combination: Ergodic achievable data rate gain vs total transmission power. 46 Figure 12 – Magnitude of average PLC CFRs. 60 Figure 13 – Magnitude of average wireless CFRs . 61 LIST OF TABLES Table 1 – Decision matrices for MRC in the first and second time slots. 55 Table 2 – Decision matrices for MRC in the third and fourth time slots. 58 Table 3 – Specification of the 18-path HIPERLAN/2 for typical office environments. 59 ACRONYMS 2S-SRC two-stage single-relay channel AWGN additive white Gaussian noise AF amplify-and-forward CFR channel frequency response CIR channel impulse responses CSI channel state information DF decode-and-forward DFT discrete Fourier transform HIPERLAN high-performance radio local area network HS-OFDM hermitian-symmetric orthogonal frequency-division multiplexing HSRC hybrid single-relay channel HOHC hybrid one-hop channel LGRC linear Gaussian relay channel LTI linear time-invariant MIMO multiple-input multiple-output MRC maximum ratio combining N-CGRC N -block circular Gaussian relay channel PLC power line communication PSD power spectral density SNR signal-to-noise ratio SRC single-relay channel TDMA time-division multiple access