2011/11/16 by Saif Khan Mohammed, Erik G. Larsson, Mohammed, Saif Khan +1 · 1 citation
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Techniques #FOS: Computer and information sciences #Full-Duplex Wireless Communications #Information Theory (cs.IT) #Wireless Communication Networks Research
paper · pdf · doi:10.48550/arxiv.1111.3752
openalex publication_date 2011/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Large antenna arrays at the base station (BS) has recently been shown to\nachieve remarkable intra-cell interference suppression at low complexity.\nHowever, building large arrays in practice, would require the use of\npower-efficient RF amplifiers, which generally have poor linearity\ncharacteristics and hence would require the use of input signals with a very\nsmall peak-to-average power ratio (PAPR). In this paper, we consider the\nsingle-user Multiple-Input Single-Output (MISO) downlink channel for the case\nwhere the BS antennas are constrained to transmit signals having constant\nenvelope (CE). We show that, with per-antenna CE transmission the effective\nchannel seen by the receiver is a SISO AWGN channel with its input constrained\nto lie in a doughnut-shaped region. For single-path direct-line-of-sight (DLOS)\nand general i.i.d. fading channels, analysis of the effective doughnut channel\nshows that under a per-antenna CE input constraint, i) compared to an\naverage-only total transmit power constrained MISO channel, the extra total\ntransmit power required to achieve a desired information rate is small and\nbounded, ii) with N base station antennas an O(N) array power gain is\nachievable, and iii) for a desired information rate, using power-efficient\namplifiers with CE inputs would require significantly less total transmit power\nwhen compared to using highly linear (power-inefficient) amplifiers with high\nPAPR inputs.\n