接收端配備濾波器的分布式波束形成技術(shù)
doi: 10.11999/JEIT141382
基金項(xiàng)目:
國家自然科學(xué)基金(61171140)和東南大學(xué)移動(dòng)通信國家重點(diǎn)實(shí)驗(yàn)室開放研究基金(2011D06)資助課題
Distributed Beamforming with Receive Filter
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摘要: 基于頻率選擇性信道中由一個(gè)發(fā)射節(jié)點(diǎn)、一個(gè)目標(biāo)節(jié)點(diǎn)和多個(gè)中繼節(jié)點(diǎn)構(gòu)成的中繼網(wǎng)絡(luò)，該文提出一種新型的分布式波束形成技術(shù)。該技術(shù)除了在中繼節(jié)點(diǎn)上采用濾波而后轉(zhuǎn)發(fā)的中繼數(shù)據(jù)中轉(zhuǎn)策略之外，在接收節(jié)點(diǎn)也配備一個(gè)有限長響應(yīng)(Finite Impulse Response, FIR)濾波器，共同均衡發(fā)射節(jié)點(diǎn)與中繼節(jié)點(diǎn)以及中繼節(jié)點(diǎn)與接收節(jié)點(diǎn)之間的頻率選擇性信道。該文中，此兩種濾波器將得到聯(lián)合優(yōu)化以提高接收節(jié)點(diǎn)的服務(wù)質(zhì)量，并同時(shí)滿足中繼節(jié)點(diǎn)的發(fā)射功率限制。仿真結(jié)果表明，相較于放大而后轉(zhuǎn)發(fā)以及濾波而后轉(zhuǎn)發(fā)但無接收濾波器的波束形成器而言，所提波束形成技術(shù)極大地提高了頻率選擇性信道中中繼網(wǎng)絡(luò)的性能。
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關(guān)鍵詞:
- 中繼網(wǎng)絡(luò) /
- 分布式波束形成技術(shù) /
- 頻率選擇性信道 /
- 濾波而后轉(zhuǎn)發(fā)
Abstract: In this paper, a new distributed beamforming technique for relay networks in frequency selective channels is proposed. The relay network consists of one transmitter, multiple relays and one receiver. To equalize the transmitter-to-relay and relay-to-receiver frequency selective channels, a Finite Impulse Response (FIR) filter at the receiver is used in addition to employing Filter-and-Forward (FF) relaying strategy at the relays. The FIR filters at the relays and the receiver are designed jointly to maximize the receive quality-of-service subject to the constraint of total relay transmitted power. Simulation results demonstrate that the proposed beamforming technique outperforms both the amplify-and-forward based beamforming method and the FF based beamforming technique without receiver filtering in frequency selective fading environments. -
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