Performance of Hybrid MQAM-LFSK (HQFM) OFDM Transceiver in Rayleigh Fading Channels

Latif, Asma; Gohar, N.D.

doi:10.1109/inmic.2006.358135

Cited by 4 publications

(2 citation statements)

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“…Recently, the normalised throughput of a coded modulation (CM) system employing FQAM over AWGN channels was observed in [6,7] to be very close to the channel capacity limit in the low signal-to-noise ratio (SNR) region, contrary to a CM system employing either FSK or QAM. The results in [2][3][4][5][6][7] indicate the significance and the availability of FQAM over AWGN channels. However, the normalised throughput of a CM system employing FQAM over Rayleigh fading channels is far away from the channel capacity limit, although it is higher than that employing FSK.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve high bandwidth efficiency as well as to keep highly power efficient, a modulation scheme combining quadrature‐amplitude modulation (QAM) with FSK, called frequency and quadrature‐amplitude modulation (FQAM), was proposed in [2] for the first time and was further extended in [3]. In [4, 5], the performance of FQAM in an orthogonal frequency‐division multiplexing (OFDM) system was analysed over AWGN and Rayleigh fading channels. Recently, the normalised throughput of a coded modulation (CM) system employing FQAM over AWGN channels was observed in [6, 7] to be very close to the channel capacity limit in the low signal‐to‐noise ratio (SNR) region, contrary to a CM system employing either FSK or QAM.…”

Section: Introductionmentioning

confidence: 99%

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Performance of multitone‐frequency and quadrature‐amplitude modulation over Rayleigh fading channels

et al. 2015

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Multitone-frequency and quadrature-amplitude modulation (MFQAM) is a combination of multitone frequencyshift keying and quadrature-amplitude modulation (QAM). In this study, the authors consider MFQAM with active subcarriers grouped in balance, where the active subcarriers are divided into a specified number of groups and the same QAM symbol is conveyed by every subcarrier in each group. This grouping may make MFQAM have frequency diversity in itself. They first derive the joint probability density function of the correlator outputs of an MFQAM receiver. They then compute the channel capacity of a coded modulation (CM) system employing MFQAM over Rayleigh fading channels. As a result, they demonstrate that for a moderate code rate between 1/3 and 2/3, its normalised throughput is close to the channel capacity limit in the low signal-to-noise ratio region, contrary to a CM system employing the conventional modulation. They also evaluate the frame error rate (FER) performance of a CM system employing MFQAM when a non-binary error-correcting code is employed. Numerical results demonstrate that the normalised throughput of the CM system computed via the FER shows a similar trend to that obtained via the channel capacity.

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