多抽頭延遲設(shè)置與幅相誤差對(duì)全雙工射頻自干擾消除的影響
doi: 10.11999/JEIT141275
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61471108, U1035002/L05, 61001087, 61101034, 61271164, 61301154)，新一代寬帶無(wú)線移動(dòng)通信網(wǎng)國(guó)家科技重大專項(xiàng)(2014ZX03003001-002, 2012ZX03003010-003, 2011ZX03001-006- 01)和863計(jì)劃項(xiàng)目(2014AA01A704)資助課題
Impact of Delay Setting, Amplitude and Phase Errors on Multi-tap Self-interference Cancellation in Full-duplex System
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摘要: 對(duì)于多徑自干擾信道場(chǎng)景下同時(shí)同頻全雙工(CCFD)無(wú)線通信系統(tǒng)，考慮射頻域多抽頭自干擾抵消技術(shù)，現(xiàn)有研究多集中于實(shí)驗(yàn)驗(yàn)證，缺少抽頭個(gè)數(shù)與延遲設(shè)置、幅度和相位等參數(shù)對(duì)自干擾抵消性能的影響分析，不利于工程參數(shù)的選取。針對(duì)此問(wèn)題，在已知抽頭個(gè)數(shù)和延遲設(shè)置的情況下，該文給出各個(gè)抽頭幅度和相位的求解方法，并推導(dǎo)了幅度和相位誤差對(duì)自干擾抵消性能影響的理論表達(dá)式。分析與仿真表明，對(duì)于特定抽頭個(gè)數(shù)，當(dāng)最大抽頭延遲小于自干擾信號(hào)主徑延遲時(shí)，自干擾抵消值隨著最大抽頭延遲的增加而增加，而當(dāng)最大抽頭延遲大于約兩倍自干擾信號(hào)主徑延遲時(shí)，自干擾抵消值隨著最大抽頭延遲的增加而減少；對(duì)于特定抽頭延遲范圍，當(dāng)抽頭個(gè)數(shù)增加或自干擾信號(hào)帶寬減少時(shí)，自干擾抵消值隨之變大；對(duì)于特定的延遲設(shè)置，隨著幅度或相位誤差的增加，自干擾抵消值越來(lái)越小。Abstract: In the context of multi-tap self-interference cancellation in the multipath channel in the Co-time Co- frequency Full Duplex (CCFD) system, the current studies focus on the experimental verification technologies in the RF-domain self-interference cancellation. The lack of performance analysis of multi-tap settings, amplitude, and phase on the self-interference is not conducive to the selection of engineering parameters. In the conditions of particular tap number and delay, this study gives the derivations for amplitude and phase of each tap, and also the influence of amplitude and phase error on the self-interference cancellation. Both the analysis and simulation show that firstly, for a specific number of taps, when the max tap delay is less than the delay of the main path of self-interference, the self-interference cancellation value is increased with the increase of the max tap delay, while the max tap delay is about two times larger than the delay of the main path of self-interference, the self-interference cancellation value decreases with the increasing of the max tap delay; secondly, for the particular tap delay coverage, when the tap number is increased or the bandwidth of self-interference signal is reduced, the self-interference cancellation value increases; thirdly, for the specific the tap number and delay setting, with the increase of amplitude or phase error, the self-interference cancellation value is more and more small.
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