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This work presents a cellular receiver capable of receiving three simultaneous channels with an aggregate bandwidth of 60 MHz, enabling a 300 Mbps downlink rate. The receiver has 16 RF LNA ports covering the cellular bands within the 572–2700 MHz frequency range. It supports LTE-advanced Rel-12 Cat6, HSPA+ Rel-11, TD-SCDMA Rel-9, and GSM/EDGE Rel-9. The 40 nm CMOS receiver consumes 13.7 mA and 17...
This work presents a cellular transceiver capable of transmitting two simultaneous channels with an aggregate bandwidth of up to 40 MHz, supporting a 100 Mbps uplink rate. The transmitter has 8 RF output ports covering the cellular transmit bands within the 572–2100 MHz frequency range. It can support TX LTE-advanced Rel-12 Cat7, HSPA+ Rel-11, TDSCDMA Rel-9, and GSM/EDGE Rel-9. The 40 nm CMOS transmitter...
In this paper, we first introduce a simple procedure for aligning interference directions in an M??N user MIMO X channel. The scheme is then modified for an M??2 user X channel in which each user is equipped with M + 1 antennas. Next we investigate the degrees of freedom (DOF) for a single antenna X channel in slow fading environments with the help of a simple relay. The relay stores all the received...
The performance of an OFDM communication system is severely affected by two types of frequency offsets. One is the difference between the frequency of the local oscillator (LO) and the received signal carrier frequency. The other is the frequency offset in the clocks of DAC's and ADC's. The frequency offset in the receiver LO is usually acquired at the beginning of each packet and later tracked in...
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