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In downlink relay systems, the conventional straightforward relaying scheme named decode-and-forward (DF) protocol is used at relay station (RS) to decode the data received from base station (BS) and forward the decoded data to the mobile station (MS) to improve the spatial diversity gain. However, conventional DF mode is spectral inefficient and not capacity optimal since the wireless channels in...
In a cooperative network, relays are often closer to the source than the destination and thus the source-relay links have a higher capacity than the source-destination one. In this paper, we investigate a hierarchical modulation-based cooperative scheme, where the relay is able to detect the whole signal, while the destination can only detect the □rst layer of the modulation. We provide an error probability...
We propose in the paper the concept of phase forward (PF) as a possible relay strategy for cooperative communication involving CPFSK modulation in a "fast" fading environment. The technique enables the relay nodes to maintain constant envelop signaling without the need to perform decoding and signal regeneration. To further reduce complexity, we adopt noncoherent discriminator detection...
This paper presents an analysis of cooperative direct-sequence code division multiple access (DS-CDMA) relay communications with one source terminal and two relay nodes with multiuser detection over the frequency-flat fading channel for uplink transmission where the decode-and-forward (DF) protocol is employed at the relay nodes. We analyze for synchronous transmission with binary phase shift keying...
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