Full-Duplex Communications and Networks by Song Lingyang & Wichman Risto & Li Yonghui & Han Zhu

Author:Song, Lingyang & Wichman, Risto & Li, Yonghui & Han, Zhu
Language: eng
Format: epub
Publisher: Cambridge University Press
Published: 2017-02-27T16:00:00+00:00

Figure 5.3 Average sum-rate versus BS transmit power with different SI attenuations (τ) under a small cell scenario ([300] Reproduced with permission from John Wiley and Sons.)

Based on the above observations, we can conclude that without both appropriate user-pairing and optimized power allocation, FD transmissions may be worse than HD transmissions in an OFDMA multi-user cellular system. To gain further insights into the system performance, we plot the percentage of sum-rate for the Dual-SPCA algorithm, relative to the HD-SUS approach in Fig. 5.4. The results show that when SI attenuation is low (80 dB), Dual-SPCA has a little gain compared with HD-SUS. This is because SI causes strong interference to the UL transmissions and FD transmissions cannot work effectively. When SI attenuation increases from 90 dB to 120 dB, we can observe a steep rise in the gain. The Dual-SPCA algorithm can provide substantial sum-rate improvements over HD-SUS. When SI attenuation is beyond 130 dB, the gain becomes flat but less than 100%. In this case, the FD system’s achievable rate will be mainly limited by noise instead of SI. If there were no IUI, FD transmissions can almost double the average sum-rates of HD transmissions. However, due to the effect of IUI, FD cannot achieve the double rate of HD systems.

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