Abstract
We investigate space shift keying, which is a simple form of spatial modulation. The bit error rate performance of line-of-sight (LOS) multiple-input and multiple-output (MIMO) was obtained in the literature with orthogonal subchannels for indoor millimeter-wave (mmWave) communications. It is essential to impose a rigid restriction on the distance between the transmitter and the receiver and antenna spacing to maintain orthogonal subchannels. However, in wireless communications, it is not viable to meet the strict distance requirements since user equipment is portable. We propose asymptotic orthogonal space shift keying with mobile stations. The asymptotic orthogonal space shift keying approaches orthogonal subchannels for a large number of transmitter and receiver antennas in correlated subchannels. This result is valuable for future wireless MIMO communications in mmWave frequencies. The massive MIMO renders the subchannel correlation symmetrical so that they can cancel each other. The example correlation model is employed for a numerical illustration. The proposed performance analysis is based on a large number of miniaturized antennas available in mmWave frequencies.
Highlights
Transmissions with millimeter-wave have been used for very high throughput wireless local area networks (WLAN) and personal area network (PAN) systems in unlicensed 60 GHz bands
We show that space shift keying (SSK) technique can achieve the performance of Orthogonal space shift keying (OSSK) asymptotically in correlated channels as the number of antennas increases
In this paper we show that the equivalent performance can be achieved without any restriction on the distance with massive multiple-input and multiple-output (MIMO) in moderately correlated channels
Summary
Transmissions with millimeter-wave (mmWave) have been used for very high throughput wireless local area networks (WLAN) and personal area network (PAN) systems in unlicensed 60 GHz bands. Orthogonal space shift keying (OSSK) was proposed in a LOS MIMO with parallel uniform linear antenna arrays for indoor mmWave communications. We show that SSK technique can achieve the performance of OSSK asymptotically in correlated channels as the number of antennas increases. We call this modulation technique asymptotic orthogonal space shift keying (AOSSK). The contribution of this paper is to show that space shift keying provides orthogonal subchannels asymptotically as the number of antennas increases in a massive MIMO without imposing a rigid restriction on the distance between the transmitter and receiver, and antenna spacing.
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