| 摘要 |
High-speed wireless data systems and methods are described for simultaneousl y supporting multiple data users, including flexible mixed-traffic services, using an illustrative CDMA architecture. Embodiments are compatible with current and third generation CDMA systems, while achieving spectral efficiencies that are in some cases an order of magnitude or more higher. Embodiments advantageously employ multiple antennas at the transmitter and receiver and code spreading to realize multiple access systems. Some illustrative receiver embodiments advantageously employ a decorrelating detector, while other features a decorrelating decision-feedback detector. I n typical operation, each of a plurality of high-speed data streams directed t o respective data users is demultiplexed into multiple (G~1) lower rate substreams, which are modulated by a CDMA spreading code and transmitted fro m Mantennas at a base station. A receiver employs Pantennas and multi-user detection to demodulate the Gdata substreams of its associated user. Performance measures for a variety of illustrative transmission and receiver configurations are derived using novel techniques for calculating system level capacities and spectral efficiencies (measured in bits per second per Hertz per sector). System design and configuration tradeoffs are readily made based on such performance determinations.
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