High Frequency Band Dispersed Tone Power Line Communication Modem for Networked Appliances

Kubota,; Сузуки,; Kawakami,; Ogaki,

doi:10.1109/icce.2006.1598360

Cited by 1 publication

(1 citation statement)

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“…Recent advances of digital signal processing (DSP) technique have accelerated the popularity of the OFDM. The technique has a lot of tolerances to frequency selective fading and multipath interference; therefore it has been adapted to numerous international standards for wired and wireless communication systems such as very-high-bit-rate digital subscriber line (VDSL) [ 3 ], power line communication (PLC) [ 4 ], wireless local area network (WLAN) [ 5 ], and ultrawideband (UWB) [ 6 ]. It is also attracting a lot of interest in visible light communication (VLC) and optical wireless communications [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Optimized Scheduling Technique of Null Subcarriers for Peak Power Control in 3GPP LTE Downlink

Cho

Park

2014

The Scientific World Journal

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Orthogonal frequency division multiple access (OFDMA) is a key multiple access technique for the long term evolution (LTE) downlink. However, high peak-to-average power ratio (PAPR) can cause the degradation of power efficiency. The well-known PAPR reduction technique, dummy sequence insertion (DSI), can be a realistic solution because of its structural simplicity. However, the large usage of subcarriers for the dummy sequences may decrease the transmitted data rate in the DSI scheme. In this paper, a novel DSI scheme is applied to the LTE system. Firstly, we obtain the null subcarriers in single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems, respectively; then, optimized dummy sequences are inserted into the obtained null subcarrier. Simulation results show that Walsh-Hadamard transform (WHT) sequence is the best for the dummy sequence and the ratio of 16 to 20 for the WHT and randomly generated sequences has the maximum PAPR reduction performance. The number of near optimal iteration is derived to prevent exhausted iterations. It is also shown that there is no bit error rate (BER) degradation with the proposed technique in LTE downlink system.

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