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DTIC ADA317916: Quotient Quadrature Amplitude Modulation (QQAM) for... |
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by Defense Technical Information Center |
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Multiplicative Rayleigh fading is a frequent problem in |
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wireless communications. If the channel is relatively |
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benign and fading is not severe, one may obtain higher |
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bit rates for an equivalent bandwidth by using M-ary |
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Quadrature Amplitude Modulation (MQAM). A variation, used |
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to combat channel fading while still retaining MQAM, is |
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differential MQAM (i.e., DQAM). The term differential |
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refers to the phase that is coded exactly as in DPSK; |
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however, the amplitude is still subject to distortion by |
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the fading channel. In this paper, we propose a technique |
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called quotient coding, which is designed to remove |
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channel effects from the symbol amplitude as well as its |
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phase. In particular, we shall apply it to MQAM, |
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resulting in modulation that we term Quotient Quadrature |
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Amplitude Modulation (QQAM). In contrast to DQAM, QQAM is |
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just as effective at suppressing the effects of channel |
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fading with respect to the entire symbol as DPSK is for |
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the phase alone. Furthermore, it can be applied to |
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arbitrary MQAM configurations. |
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Date Published: 2018-04-03 21:54:52 |
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Identifier: DTIC_ADA317916 |
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Item Size: 21533327 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Shensa, M. J.; NAVAL CO... |
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@chris85 |
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