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A frequency-agile single-chip QAM modulator with beamformingdiversity

机译：具有波束成形多样性的频率捷变单芯片QAM调制器

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摘要

Architecture and circuit design techniques for VLSI implementationnof a single-chip quadrature amplitude modulation (QAM) modulator withnfrequency agility and antenna beamforming characteristics are presented.nIn order to achieve reliable wireless communication modem function, thensingle chip all-digital QAM modulator implements various features,nincluding high data rates with bandwidth efficiency, flexibility,nmeeting a wide variety of user throughput requirements with variable andnwidth and data rates in a multi-user system, and robustness,nincorporating diversity and redundancy techniques to guarantee robustncommunication for various operating environments. The modulatorncomponents consist of several digital processing building blocks,nincluding various finite-impulse-response (FIR) filters, an innovativenvariable interpolation filter, a four-channel frequency translator withnquadrature mixer for antenna beamforming diversity, a quadrature directndigital frequency synthesizer (QDDFS), a numerically controllednoscillator (NCO), a QAM formatter, a pseudorandom noise (PN) generator,nan x/sinx filter, and a microcontroller interface. An optimizednarchitecture and chip implementation for the variable modulator isnderived and evaluated which will support symbol rates from 6 kBaud ton8.75 MBaud continuously and digitally flexible IF frequencies up to 70nMHz with four-channel antenna beamforming function
机译：提出了具有频率捷变和天线波束成形特性的单芯片正交调幅（QAM）调制器的VLSI实现的体系结构和电路设计技术。为了实现可靠的无线通信调制解调器功能，单芯片全数字QAM调制器实现了多种功能，包括具有带宽效率，灵活性的高数据速率，满足多用户系统中可变的带宽和数据速率的各种用户吞吐量要求，以及健壮性，融合多样性和冗余技术以确保在各种操作环境下的健壮通信。调制器组件包括几个数字处理构件，包括各种有限脉冲响应（FIR）滤波器，创新的可变插值滤波器，带有用于天线波束形成分集的正交混频器的四通道频率转换器，正交直接数字频率合成器（QDDFS），数控振荡器（NCO），QAM格式器，伪随机噪声（PN）发生器，nan x / sinx滤波器和微控制器接口。推导并评估了可变调制器的优化体系结构和芯片实现，它将支持6 kBaud ton8.75 MBaud的符号率和具有四通道天线波束形成功能的高达70nMHz的数字灵活IF频率。

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