open-loop wide-bandwidth phase modulation techniques
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ID: 211669
2011
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Abstract
The ever-increasing growth in the bandwidth of wireless communication channels requires the transmitter to be wide-bandwidth and power-efficient. Polar and outphasing transmitter topologies are two promising candidates for such applications, in future. Both these architectures require a wide-bandwidth phase modulator. Open-loop phase modulation presents a viable solution for achieving wide-bandwidth operation. An overview of prior art and recent approaches for phase modulation is presented in this paper. Phase quantization noise cancellation was recently introduced to lower the out-of-band noise in a digital phase modulator. A detailed analysis on the impact of timing and quantization of the cancellation signal is presented. Noise generated by the transmitter in the receive band frequency poses another challenge for wide-bandwidth transmitter design. Addition of a noise transfer function notch, in a digital phase modulator, to reduce the noise in the receive band during phase modulation is described in this paper.
| Reference Key |
nidhi2011journalopen-loop
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|---|---|
| Authors | ;Nitin Nidhi;Pin-En Su;Sudhakar Pamarti |
| Journal | Molecular diversity |
| Year | 2011 |
| DOI |
10.1155/2011/507381
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| URL | |
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