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Article overview
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Generalized Space and Frequency Index Modulation | | T. Datta
; H. S. Eshwaraiah
; A. Chockalingam
; | | Date: |
27 Jun 2015 | | Abstract: | Unlike in conventional modulation where information bits are conveyed only
through symbols from modulation alphabets defined in the complex plane (e.g.,
quadrature amplitude modulation (QAM), phase shift keying (PSK)), in index
modulation (IM), additional information bits are conveyed through indices of
certain transmit entities that get involved in the transmission. Transmit
antennas in multi-antenna systems and subcarriers in multi-carrier systems are
examples of such transmit entities that can be used to convey additional
information bits through indexing. In this paper, we introduce {em generalized
space and frequency index modulation}, where the indices of active transmit
antennas and subcarriers convey information bits. We first introduce index
modulation in the spatial domain, referred to as generalized spatial index
modulation (GSIM). For GSIM, where bits are indexed only in the spatial domain,
we derive the expression for achievable rate as well as easy-to-compute upper
and lower bounds on this rate. We show that the achievable rate in GSIM can be
more than that in spatial multiplexing, and analytically establish the
condition under which this can happen. It is noted that GSIM achieves this
higher rate using fewer transmit radio frequency (RF) chains compared to
spatial multiplexing. We also propose a Gibbs sampling based detection
algorithm for GSIM and show that GSIM can achieve better bit error rate (BER)
performance than spatial multiplexing. For generalized space-frequency index
modulation (GSFIM), where bits are encoded through indexing in both active
antennas as well as subcarriers, we derive the achievable rate expression.
Numerical results show that GSFIM can achieve higher rates compared to
conventional MIMO-OFDM. Also, BER results show the potential for GSFIM
performing better than MIMO-OFDM. | | Source: | arXiv, 1506.8291 | | Services: | Forum | Review | PDF | Favorites | |
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