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User cooperative is a powerful tool to combat fading and to increase robustness for communications over wireless channels. For cooperative relaying communications, the outage probability and the expected rate (throughput) can be greatly improved when the superposition coding relaying (SC‐relaying) strategy is employed. Under the assumption of high signal‐to‐noise ratio (SNR), this work contributes...
The principle of CDMA mode in TD-SCDMA(TD), which means how spectrum spreading and scrambling code being used in TD is a basic problem. Comparing with the other two 3G standards, the principle and realization of the CDMA mode used in TD standard has much difference. Both cdma2000 and FDD WCDMA use the CDMA mode of real spectrum spreading and complex scrambling code, which is the traditional concept...
Superposition coding relaying (SC-relaying) has the merit of high throughput. At the same time, the investigation of the diversity-multiplexing tradeoff (DMT) is also particularly useful for the design and analysis of cooperative relaying strategy. In this work, we consider a two-level rate SC-relaying strategy without the channel state feedback under short term power constraint. For the SC-relaying...
The working principle, implementation circuit and performance analysis of complex spectrum spreading and scrambling code in TD-SCDMA (TD) are discussed in this paper. Assuming 8 users and 3-path propagation channels or without multi-path fading environment, the performance comparison between TD and cdma2000 is studied in this paper. With three-level mode in base-band signal and small spreading factor...
SA (smart antennas) is a core technology of TD-SCDMA system. That is because people consider that a set of SA can simultaneously directionally receive multiple CDMA channel signals on a single carrier. And then according the reciprocity of transceiver, the directional transmission of multiple CDMA channel signals can also be realized on a single carrier by a set of SA. This technology can dramatically...
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