在MIMO系統中，使用時空調變(spatial modulation, SM)的方法雖然能解決載波間干擾(inter-carrier interference, ICI)的問題，但由於每次傳送只會啟動一根天線，導致信息量太低。在現有的方法中，廣義時空調變(generalized spatial modulation, GSM)，其調變過程中每次會啟動固定數量的天線(兩根以上)，這方法非常有效地解決信息量不足的缺失，並大大增加傳送效率。
但GSM也存在明顯的問題，那就是不容易設計啟動天線的總數量。若啟動天線總數設定的太大就會造成ICI問題，導致增加偵測估計的錯誤次數；若啟動天線總數設定的太少則會信息量太低，嚴重影響傳送效率。
為解決這問題，本篇論文基於New Block-Based Spatial Modulation提出了特別的方法，使用啟動方塊時空調變(active-block spatial modulation, ABSM)，這方法有個特色，那就是在每個時間點所啟動的天線數量是不固定的，這不但避免了ICI的問題，也降低了錯誤率，還提升了資料傳輸率，巧妙平衡了許多缺失。

In the MIMO system, although the method of using spatial modulation (SM) can solve the problem of inter-carrier interference (ICI). But unfortunately, because only one antenna is activated for transmission, the data rate is too low. In the existing method, generalized spatial modulation (GSM), a fixed number of antennas (two or more) are activated for each time slot in the modulation process. This method is very effective in solving the problem of too little data rate and greatly increases the transmission efficiency.
However, GSM also has the obvious problem that it is not easy to design the total number of activated antennas. If the total number of activated antennas is set too large, it will cause ICI problems. It leads to an increase in the number of errors in detection estimation. If the total number of activated antennas is set too low, the date rate will be too low. This can seriously affect the efficiency of the transmission.
To solve this problem, the paper proposes a special approach based on New Block-Based Spatial Modulation, that is, active-block spatial modulation (ABSM). This method has a feature that the number of antennas activated in each time slot is not fixed. It not only avoids the ICI problem, but also reduces the error probability. It also improves the data rate and cleverly balances many shortcomings.

[1] R. Y. Mesleh et al., “Spatial modulation,” IEEE Trans. Veh. Technol., vol. 57, no. 4, pp. 2228–2241, Jul. 2008.
[2] J. M. Luna-Rivera et al., “Constellation design for spatial modulation,” Procedia Technol., vol. 7, pp. 71–78, 2013.
[3] M. Di Renzo et al., “Spatial modulation for generalized MIMO: Challenges, opportunities, and implementation,” Proc. IEEE, vol. 102, no. 1, pp. 56–103, Jan. 2014.
[4] D. A. Basnayaka and H. Haas, “Spatial modulation for massive MIMO,” in Proc. IEEE ICC, Jun. 2015, pp. 1945–1950.
[5] Shyam Gadhai, A. K. Sah, A. K. Singh, Rohit Budhiraja, A. K. Chaturvedi, “New Block-Based Spatial Modulation,” IEEE Commun Lett Vol. 22, no. 10, Oct. 2018, pp. 2016–2019