Group-Based LED Selection for Generalized Spatial Modulation in Visible Light Communication

Visible light communication (VLC) systems have attracted considerable attention in recent years. However, it still faces the challenges of user mobility and random device orientation, which will result in unreliable connection and performance degradation. In this letter, we propose a group-based LED selection aided generalized spatial modulation (GLS-GSM) scheme to tackle this issue by preventing some poor LEDs from communication. Firstly, the LEDs are divided into several equal-sized groups. Then, each group conducts Euclidean distance-based LED selection (ED-LS) and spatial modulation (SM) independently. Moreover, an ED-based grouping criterion is exploited to search for an optimal grouping strategy. The bit error rate (BER) performance of the proposed scheme is evaluated for sitting and walking activities. Numerical simulation results demonstrate the effectiveness of the proposed method.