Importance

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Abstract

Apparatus and methods for conducting communication over a wireless or other network using a multi-carrier energy-spreading approach. In one embodiment, an energy-spreading technique (EST) is applied within a multi-carrier or MC-CDMA system to improve signal detection performance and diversity. Significant improvements in E.sub.b/N.sub.0 are achieved for both indoor and urban paradigms over systems without such EST capability. In another variant, a code-divided system with two transmit antennas is disclosed having a diversity code (e.g., Alamouti code) used to obtain enhanced transmit diversity. Another variant incorporates a 'symbol shuffling' scheme (together with the aforementioned EST) to enhance diversity and performance. The symbol shuffling scheme and diversity code may also be combined to provide a matched filter bound (MFB) for systems with four or more antennas. Exemplary base station and subscriber (e.g., mobile) unit configurations are also disclosed, as well as system architectures implementing the foregoing.

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First Claim