Frequency Hopping Overcomes Multipath Fading using FEC

Multipath Delay Estimation for Frequency Hopping Systems

Slow frequency-hopping multicarrier DS-CDMA for transmission over Nakagami multipath fading channels

A novel multiple access scheme based on slow frequency hopping multicarrier direct-sequence code division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrowband CDMA and third-generation wideband CDMA systems. The frequency hopping patterns are controlled by a set of constant-weight codes. Consequently, mult...

Generalized frequency hopping OFDMA through unknown frequency-selective multipath channels

The Generalized Frequency Hopping (GFH) OFDMA system developed in this paper permeates FH bene ts to multicarrier CDMA transmissions through unknown frequencyselective multipath channels. No single user su ers from consistent fading e ects and multiuser interference is eliminated by design. Constellation-irrespective channel identi ability is guaranteed, and a host of blind channel estimation a...

Doppler Frequency Estimation in Multipath Fading Channels

As prior knowledge of Doppler frequency has been found useful in many applications of mobile communications, it is necessary to estimate the Doppler frequency at the mobile station (MS) based on the received fading signal. Rice et al 1] had derived Doppler frequency estimates using continuous-time received fading signals. In the present investigation, level crossing rate (LCR) and autocorrelati...

Multipath & Fading

In radar processing, multipath causes ghost targets to appear, deceiving the radar receiver. These ghosts are particularly bothersome since they move and behave like the normal targets (which they echo), and so the receiver has difficulty in isolating the correct target echo. These problems can be overcome by incorporating a ground map of the radar's surroundings and eliminating all echoes whic...