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Wireless systems and interference avoidance
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DOI：10.1109/TWC.2002.800540.png)
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Abstract
En 中文
Motivated by the emergence of programmable radios, we seek to understand a new class of communication system where pairs, of transmitters and receivers can adapt their modulation/demodulation method in the presence of interference to achieve better performance. Using signal to interference ratio as a metric and a general signal space approach, We present a class of iterative distributed algorithms for synchronous systems which results in an ensemble of optimal waveforms for multiple users connected to a common receiver (or colocated independent receivers). That is, the waveform ensemble meets the Welch Bound with equality and, -therefore, achieves minimum average interference over the ensemble of signature waveforms. We derive fixed points for a number of scenarios, provide examples, look briefly at ensemble stability under user addition and deletion as well as provide a simplistic comparison to synchronous code-division multiple-access. We close with suggestions for future work.
Keywords:
adaptive modulation
code-division multiple-access systems
codeword optimization
interference avoidance
multiuser detection
sum capacity
vector channels
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