Abstract
Differential spatial modulation (DSM) is able to transmit additional data bits without increasing the number of radio-frequency chains and power consumption and also avoids pilot overhead. In this paper, we propose two new schemes of DSM to improve the original DSM. One is an increased-rate scheme that transmits one additional data bit per two blocks. The bit mapping and maximum-likelihood detection is particularly designed. The goal of the second scheme is to increase the diversity of DSM. By properly designing block coded modulation and complex antenna-index matrices, the proposed scheme can achieve the desired diversity order. Compared with the existing schemes with the same constellation of the transmitted signals, the proposed scheme achieves higher transmission rates.
Highlights
Various multi-antenna techniques have been proposed for increasing transmission rates of wireless communications
differential spatial modulation (SM) (DSM) is a special case of differential space-time modulation (DSTM) [13], [14]
In [18] and [19], we indicated that differential encoding can be performed by looking up a table
Summary
Various multi-antenna techniques have been proposed for increasing transmission rates of wireless communications. In [7], we proposed a systematic design of complex-valued antenna-index matrices to avoid the unbounded constellation size. One scheme is increased-rate DSM which transmits one additional data bit per two blocks. DSM using repeated symbols was proposed in [6], and various coded DSM schemes were designed in [9]- [12]. Author et al.: Preparation of Papers for IEEE TRANSACTIONS and JOURNALS we propose a different method to increase the diversity of DSM. CN (0, σ2) denotes the zero-mean, σ2-variance, complex Gaussian distribution
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