2012 # Combined channel estimation and PAPR reduction technique for MIMO–OFDM systems with null subcarriers

**Abstract:** In this article, we address the challenges regarding the provision of channel state information as well as reducing peak-to-average power ratio (PAPR) of a multiple input multiple output orthogonal frequency multiplexing (MIMO-OFDM) system. The mean squared error (MSE) of the channel estimate is adopted as the optimization criterion to design pilot symbols for channel estimation in MIMO-OFDM systems with null subcarriers. We design the placement and power distribution to the pilot symbols for multiple transmit…

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“…To facilitate the development of the FITRA [15], in order to minimize the largest magnitude of all antennas' signals, (12) can be restated in Lagrangian form as min x λkxk 1 þ ky À Hxk 2 2 ;…”

confidence: 99%

“…To facilitate the development of the FITRA [15], in order to minimize the largest magnitude of all antennas' signals, (12) can be restated in Lagrangian form as min x λkxk 1 þ ky À Hxk 2 2 ;…”

confidence: 99%

“…To frame the PAPR reduction as a sparse signal-recovery problem, the equality constraint in (12) can be relaxed to the following form…”

confidence: 99%

“…Differently 2 Wireless Communications and Mobile Computing from the 3rd order polynomial-based pilot allocation, the 5th order polynomial-based pilot allocation performed well with both the OFDM block sizes, 512 and 1024. In [13], the 5th order polynomial-based pilot allocation was also applied to MIMO-OFDM systems. However, the 5th order polynomial-based pilot allocation requires more complicated implementation than the 3rd order polynomial-based pilot allocation because the 5th order polynomial-based pilot allocation applies exhaustive search of two parameters by using two fractional unit resolutions.…”

confidence: 99%

“…The averaged MSEs in terms of a / when p = /16 and SNR = 20 dB in the cases of (a) = 2048 and (b) = 4096. The 푘 / 푘 results as shown in(13) with respect to the 16 smallest eigenvalues of (1/ p )D 퐻 p D p when = 2048, a = 1884, and p = 128.…”

mentioning

confidence: 99%

“…Combination of TR and clipping methods have also been proposed in [17]. Recently, a combined channel estimation and PAPR reduction technique was proposed by [18] in which phase information of the pilot, together with TR, were used to mitigate PAPR of the information-bearing signal for MIMO-OFDM system with null subcarriers. An overview of previous proposed PAPR reduction techniques are given in [19], [20].…”

confidence: 99%