Equal gain transmission in multiple-input multiple-output wireless systems

Love, David J.; Heath, Robert W.

doi:10.1109/tcomm.2003.814195

Cited by 330 publications

(159 citation statements)

References 23 publications

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“…The PAPR is commonly used as a physical performance indicator in wireless communication systems with pre-post equalisers. From one point of view, TR and PC can be seen as counterparts to the maximum ratio transmission/combining and EGT/combining techniques [21,27] which are well known in MISO systems and frequency domain equalisers. From another point of view, PC can be considered as an equaliser that is an intermediate choice between TR and zero forcing (ZF) [22,25].…”

Section: Principles Of Tr and Pcmentioning

confidence: 99%

“…For PC the frequency dependent phase of the system response is extracted, and the excitation signals are designed to have the opposite spectral phase. In this way, PC can be seen as an equal gain transmission (EGT) [21] which is implemented in the frequency domain. In equal gain transmitters, which are commonly used in multiple antenna systems, transmitted signals from different antennas are passed through appropriate phase filters to arrive coherently at the receiver.…”

Section: Introductionmentioning

confidence: 99%

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Phase compensation communication technique against time reversal for ultra‐wideband channels

Dezfooliyan¹,

Weiner²

2013

IET Communications

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Phase compensation (PC) prefiltering is experimentally investigated for multipath channels over the frequency band spanning 2-12 GHz, a topic which to the best of the authors knowledge has not been studied in the literature on ultrawideband (UWB) communications. The authors emphasis is to assess the capabilities of PC compared to time reversal (TR) prefilters over indoor UWB channels regarding multipath suppression, channel hardening, noise sensitivity and high-speed data transmission. Experiments were carried out for PC and TR prefilters in both line-of-sight (LOS) and non-LOS (NLOS) environments. The multipath compression effectiveness is characterised by computing the root-mean-square delay spread and peak-to-average power ratio for actual measured channels and for the IEEE 802.15.4(a) UWB model. The authors study suggests PC outperforms TR considerably in mitigating the multipath channel dispersion. Bit-error-rate (BER) curves have been simulated for data rates in the range of 125-4000 Mbps based on the measured channel responses. The BER simulations suggest that while the TR performance is prohibitively saturated by its residual intersymbol interference for data rates of 500 Mbps and above (especially in NLOS), PC can be used for high-speed data transmissions as fast as 2 Gbps in both LOS and NLOS environments.

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Section: Principles Of Tr and Pcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase compensation communication technique against time reversal for ultra‐wideband channels

Dezfooliyan¹,

Weiner²

2013

IET Communications

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“…Assume that perfect channel information of H and f is available at the receiver. The receiver applies the maximal ratio combining [2] w = Hf to x(k) and delivers output…”

Section: Codeword Selection Criterionmentioning

confidence: 99%

“…Codebooks based on vector quantisation, Lloyd algorithm [1], Grassmannian line packing [1], and discrete Fourier transform (DFT) [2,3] are reported. Additionally, since the MIMO technique is used together with the orthogonal frequency division multiplexing (OFDM) technique in practical communication systems, transmitted signals should not be with high peak to average power ratio (PAPR).…”

Section: Introductionmentioning

confidence: 99%

Fast codeword selection for limited feedback beamforming multiple‐input–multiple‐output systems using breadth‐first tree search

2013

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Codebooks with constant modulus entries are being considered for the limited feedback beamforming multiple-inputmultiple-output (MIMO) system to improve the power amplifier efficiency at the transmitter. Assume that one such codebook is known to both the transmitter and receiver. The receiver must determine a target codeword from this codebook and send its index back to the transmitter. A receiver can be implemented with low cost if fast codeword selection algorithm is executed. In this study, the authors utilise the properties possessed by three such codebooks and propose a novel tree search algorithm for fast codeword selection. Compared with two previously reported codeword selection algorithms, our algorithm is of fixed complexity and does find the target codeword. Furthermore, our algorithm for codeword selection is similar to the tree search for MIMO detection. These two similar tree search algorithms for both codeword selection and MIMO detection can be implemented by the same hardware architecture. A baseband receiver with small chip area for the dual-mode (the spatial multiplexing and beamforming transmission modes) MIMO system is possible.

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“…These practical problems should be considered for new transmit beamforming vectors design in MU-MIMO broadcast channels. In MIMO channels, equal gain precoding is substantially investigated in [9][10][11]. It not only overcomes the linearity problem of power amplifiers, but also reduces the feedback overhead, since only the phase information is feedbacked.…”

Section: Introductionmentioning

confidence: 99%