Merging Multicarrier CDMA and Oscillating-Beam Smart Antenna Arrays: Exploiting Directionality, Transmit Diversity, and Frequency Diversity
| Autor: | S. Shattil, Carl R. Nassar, Seyed A. Zekavat |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Reconfigurable antenna
Engineering business.industry Smart antenna Electrical engineering Data_CODINGANDINFORMATIONTHEORY Space-division multiple access Antenna diversity law.invention Cooperative diversity Antenna array Transmit diversity law Electronic engineering Electrical and Electronic Engineering business Computer Science::Information Theory Diversity scheme |
| Zdroj: | IEEE Transactions on Communications. 52:110-119 |
| ISSN: | 0090-6778 |
| Popis: | In this paper, a novel merger of multicarrier code-division multiple access (MC-CDMA) and smart antenna arrays is introduced. Here, a group of Q carriers in the MC-CDMA system is applied to its own M-element smart antenna array at the base station (BS). The smart antennas are located in close proximity to one another. We generate a transmit diversity gain at the receiver by carefully moving (oscillating) the antenna array's pattern. The pattern oscillation is achieved by applying appropriate time-varying phases to array elements of each smart antenna. The beam pattern oscillation ensures a mainlobe at the position of the intended user and small oscillations in the beam pattern. This beam pattern oscillation leads to a time-varying channel with a controllable coherence time; hence, a transmit diversity benefit, in the form of a time diversity benefit, is available at the receiver. Employing MC-CDMA with the proposed smart antenna at the BS, we achieve: 1) directionality which creates high network capacity via space-division multiple access; 2) a transmit diversity gain which supports high performance at the receiver in the mobile unit; and 3) increased capacity and performance via MC-CDMA's ability to support both CDMA and frequency diversity benefits, respectively. |
| Databáze: | OpenAIRE |
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