**Acknowledgments**

This work has been funded in part by the Spanish Research Administration (TEC2009-14059-C03-02), by the Canary Government (SolSubC200801000306) and the Plan E (Spanish Economy and Employment Stimulation Plan).

## **Author details**

20 Will-be-set-by-IN-TECH

**Figure 10.** Performance comparison of multi-user LS detection based on imaging reception for two

networks, but further research still needs to be carried out.

Plan E (Spanish Economy and Employment Stimulation Plan).

In this chapter, the employment of multi-user LS detection in conjunction with angle-diversity receivers and OFDM modulation technique for wireless optical communication has been evaluated. The MIMO optical channel model, which can be determined by using Monte Carlo-based ray-tracing algorithms, has been described in detail. This algorithm allows us to determine LOS and multiple-bounce reflection contributions to the received optical power at the photodetector, which enables a more accurate analysis of the proposed system performance. The multi-user detector, which is based on the linear combining of the incoming signals at its receiving branches, is shown to have a performance very close to that of the optimum ML detector. Additionally, it has been observed that strategies to find the truly significant receiving branches, during the data retrieving for a specific user, can be applied to reduce the complexity of the demodulation problem while maintaining and, even improving, the system performance. The results have also shown that aggregate high data rates can be obtained for indoor wireless optical communications at practical signal-to-noise ratios. Finally, the proposed multi-user OFDM system has been assessed for a visible-light communication scenario, where imaging reception is assumed. The preliminary results show that the previous scheme is an attractive candidate for developing high-capacity VLC

This work has been funded in part by the Spanish Research Administration (TEC2009-14059-C03-02), by the Canary Government (SolSubC200801000306) and the

positions of the detector array

**Acknowledgments**

**7. Conclusions**

Oswaldo González *Dept. Fundamental and Experimental Physics, Electronics and Systems University of La Laguna, Spain*

### **8. References**

