In this paper, the expressions for calculating the bit error rate (BER) performance of noncoherent frequency-hopped Mary frequency-shift-keying (NC-FH/MFSK) receiver, subjected to independent multitone jamming (IMTJ) and partial-band jamming (PBJ), are derived. We observe that the the jamming tones in IMTJ strategy are, in fact, equivalent to the cochannel interferences in the network of IEEE 802.11 NC-FH/MFSK devices. Also, the major source of interference from outside of such network (coexisting network interference) is the IEEE 802.11 a/b/g devices whose signal is very similar to that of the jammer in PBJ strategy. Therefore, we combine the expressions for IMTJ and PBJ together and create a new combinedjamming formula for determining the link performance in IEEE 802.11 NC-FH/MFSK networks. As an example, we also illustrate the application of the new formula on the channel assignment (CA) problem in multiradio NC-FH/MFSK wireless mesh networks. Because the combined-jamming formula can take into account both the cochannel interference and the outside interference, it can predict fairly accurate BERs for determining appropriate channels in the network.
In this paper, we propose an alternative digital simulcasting AM radio, which uses spread spectrum technology to carry the digital data on the quadrature carrier. Because the modulation process is simple, compared to OFDM technology used in existing digital radio systems, the transmitter and receiver equipments can be economically implemented. Also, because the original analog audio (the in-phase component) remains intact during the modulation process, listeners with traditional AM tuner can still receive the same audio-only radio program. The simulation results have shown that the data rate of up to 8 kbps is achievable at SNR=10dB and the power required for the digital broadcast can be as low as -25 dB below the power of the unmodulated carrier.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.