In this paper we propose a novel transmit signal structure and an adjusted and optimized receiver for OFDM (orthogonal frequency division multiplexing). Instead of the conventional cyclic prefix (CP) we use a deterministic sequence, which we call unique word (UW), as guard interval. We show how unique words, which are already well investigated for single carrier frequency domain equalization (S...

Orthogonal Frequency Division Multiple Access (OFDMA) has recently been applied widely in wireless communication systems due to its high data rate transmission capability with high bandwidth efficiency and its robustness to multi-path fading. But it has several inherent disadvantages such as the large PAPR and the sensitivity to Carrier Frequency Offset (CFO).Hence much attention has been focus...

We develop a new linear space-time precoding scheme for OFDM systems based on channel state information at the transmitter. The filter is derived for frequency-selective MISO as well as for SISO channels using a minimum mean square error criterion with a constraint on transmit power. The guard interval of the resulting transmitted signal is no longer cyclic extension. Drawbacks of OFDM systems ...

Based on Autler–Townes splitting and AC Stark shifts, we present a Rydberg atom-based receiver for determining the amplitude modulation (AM) frequency among wideband carrier range utilizing cesium atomic vapor cell. To verify this approach, measured signal-to-noise ratio data capacity with 10 kHz AM in from 2 GHz to 18 GHz. Without changing lasers, working band can be easily extended higher by ...

To reduce the sampling rate in global navigation satellite system (GNSS)-radio occultation receivers, it is essential to establish a suitable estimation of Doppler frequency from the received signal in the satellite onboard receiver. This receiver is usually located on low earth orbit satellite and receives GNSS satellites signal in the occultation situation. The occurred Doppler on the signal ...