Andere Kunden interessierten sich auch für
![CMOS Single Chip Fast Frequency Hopping Synthesizers for Wireless Multi-Gigahertz Applications]( "CMOS Single Chip Fast Frequency Hopping Synthesizers for Wireless Multi-Gigahertz Applications")
CMOS Single Chip Fast Frequency Hopping Synthesizers for Wireless Multi-Gigahertz Applications74,99 €![RF System Design of Transceivers for Wireless Communications]( "RF System Design of Transceivers for Wireless Communications")
RF System Design of Transceivers for Wireless Communications142,99 €![Baseband Analog Circuits for Software Defined Radio]( "Baseband Analog Circuits for Software Defined Radio")
Baseband Analog Circuits for Software Defined Radio83,99 €![RF Power Amplifiers for Mobile Communications]( "RF Power Amplifiers for Mobile Communications")
RF Power Amplifiers for Mobile Communications103,99 €![RF System Design of Transceivers for Wireless Communications]( "RF System Design of Transceivers for Wireless Communications")
RF System Design of Transceivers for Wireless Communications132,99 €![Enhanced Radio Access Technologies for Next Generation Mobile Communication]( "Enhanced Radio Access Technologies for Next Generation Mobile Communication")
Enhanced Radio Access Technologies for Next Generation Mobile Communication74,99 €![Enhanced Radio Access Technologies for Next Generation Mobile Communication]( "Enhanced Radio Access Technologies for Next Generation Mobile Communication")
Enhanced Radio Access Technologies for Next Generation Mobile Communication74,99 €
In the market of wireless communication, high data-rate transmission and high spectral efficiency have been the trend. The IEEE 802.11 a/g standards working at 5GHz/2.4GHz ISM bands can support data rate up to 54Mbits/s using OFDM modulation. The newly proposed 802.11n technology now uses 64-QAM to achieve higher spectral efficiency. The DVB and many other systems will also use QAM for its data transmission.
The cost of achieving this higher spectral efficiency using higher order QAM is that the transmitter and receiver requires a higher signal to noise ratio (SNR) with the same level of error rate performance (relative to a baseline BPSK, QPSK and other systems). One of the dominant vectors on SNR degradation is I/Q image rejection (I/Q gains and phases imbalance).
There are a lot of factors that degrade the matching of gains and phases between I/Q signals: the instinct layout mismatch, the random mismatch of the devices, the different temperatures over the I/Qsignal paths. IQ Calibration Techniques For CMOS Radio Transceivers describes a fully-analog compensation technique without baseband circuitry to control the calibration process. This book will use an 802.11g transceiver design as an example to give a detailed description on the I/Q gains and phases imbalance auto-calibration mechanism.
The cost of achieving this higher spectral efficiency using higher order QAM is that the transmitter and receiver requires a higher signal to noise ratio (SNR) with the same level of error rate performance (relative to a baseline BPSK, QPSK and other systems). One of the dominant vectors on SNR degradation is I/Q image rejection (I/Q gains and phases imbalance).
There are a lot of factors that degrade the matching of gains and phases between I/Q signals: the instinct layout mismatch, the random mismatch of the devices, the different temperatures over the I/Qsignal paths. IQ Calibration Techniques For CMOS Radio Transceivers describes a fully-analog compensation technique without baseband circuitry to control the calibration process. This book will use an 802.11g transceiver design as an example to give a detailed description on the I/Q gains and phases imbalance auto-calibration mechanism.