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The recently proposed subset-based coherent fast frequency hopping (S-CFFH) scheme enables reliable channel estimation for FFH over fading channel. With S-CFFH/16-QAM, we propose the optimum and suboptimum maximum-likelihood (ML) receivers in the presence of partial band noise jamming (PBNJ), frequency-selective Rayleigh fading, and Gaussian channel estimation errors. We analyze the bit error ratio...
The subset-based coherent fast frequency hopping (S-CFFH), was recently proposed to enable reliable channel estimation and coherent schemes for FFH over fading channels. In this paper, we analyze the maximum-likelihood (ML) receiver for the S-CFFH/binary phase shift keying (BPSK), with partial band noise jamming (PBNJ), frequency selective Rayleigh fading, and imperfect channel state information (CSI)...
As an overlay cognitive radio, transform domain communication system (TDCS) has been proposed to support reliable communications with low probability of interception. However, most of research on TDCS assume perfect synchronization to simplify algorithm design. In this paper, we present a low complexity symbol timing offset (STO) and carrier frequency offset (CFO) estimation method for practical TDCS...
Fast frequency hopping (FFH) is a powerful antijamming method. Nevertheless, channel estimation in FFH is a difficult issue and even once was deemed impractical. FFH over fading channels usually adopts noncoherent schemes that suffer from combination loss and low spectral efficiency. To address these issues, in this letter, we propose a subset-based coherent FFH (S-CFFH) scheme. The proposed scheme...
Recently, a proactive estimation method has been proposed to obtain the cross-channel gain from cognitive transmitter (CT) to primary receiver (PR), where CT acts as a full-duplex amplified-and-forward (AF) relay for primary users. However, since the cognitive and primary users usually have no cooperation, it has no guarantee that the direct and relay signals are synchronized, i.e., the time delay...
In uplink of interleaved single carrier frequency division multiple access (SC-FDMA) systems, multiple access interference (MAI) arises from different carrier frequency offsets (CFOs) from different users at the receiver. In this paper, the performance of uplink interleaved FDMA (IFDMA) in the presence of CFOs is exactly analyzed. An expression of signal to interference plus noise power ratio (SINR)...
Relay selection enhances the performance of the cooperative networks by selecting the links with higher capacity. Meanwhile link adaptation improves the spectral efficiency of wireless data-centric networks through adapting the modulation and coding schemes (MCS) to the current link condition. In this paper, relay selection is combined with link adaptation for distributed beamforming in a two-hop...
We consider relay selection technique in a cooperative cellular network where user terminals act as mobile relays to help the communications between base station (BS) and mobile station (MS). A novel relay selection scheme, called Joint Uplink and Downlink Relay Selection (JUDRS), is proposed in this paper. Specifically, we generalize JUDRS in two key aspects: (i) relay is selected jointly for uplink...
Conventional distributed Alamouti-like space-time block codes (STBC) transmission strategy in two-user cluster-based cooperative communication systems (Sushanta and Monisha, 2008) is extended to single-carrier frequency-domain equalization (SC-FDE) systems, and a two-user cooperative transmission scheme in distributed frequency division multiple access (DFDMA) systems is proposed for uplink wireless...
A new two-user cooperative transmission scheme with low-complexity frequency-domain equalization (FDE) for single carrier frequency division multiple access (SC-FDMA) systems in localized subcarrier mapping mode is proposed for uplink wireless transmission in this paper. At the destination, each user's information can be obtained with a simpler diversity combing and a lower-complexity FDE than existing...
Cooperative diversity enables single antenna transmitter in a multi-user or relay environment to share the antennas so as to achieve diversity gain. In this work, the cooperative communication system with distributed Alamouti code is investigated, where amplify-and-forward (AF), adaptive decode-and-forward (DF) or hybrid AF/DF are used at the relay, with both Rayleigh fading and path loss effect introduced...
Cooperative diversity has recently emerged as novel communication scheme for future wireless communications because of diversity gain, which is achieved by sharing each cooperative user's antenna to form a virtual antenna array in the wireless network. Previous works on analysis of system performance of cooperative networks mainly focused on static scenarios. In this paper, we derive exact average...
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