Code division multiplexing in a single-carrier frequency division multiple access system

摘要

In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA (LFDMA), a transmitter generates modulation symbols for different types of data (e.g., traffic data, signaling, and pilot) and performs code division multiplexing (CDM) on at least one data type. For example, the transmitter may apply CDM on signaling and/or pilot sent on frequency subbands and symbol periods that are also used by at least one other transmitter. To apply CDM to a given data type (e.g., signaling), the transmitter performs spreading on the modulation symbols for that data type with an assigned spreading code. CDM may be applied across symbols, samples, samples and symbols, frequency subbands, and so on. The transmitter may perform scrambling after the spreading. The transmitter generates SC-FDMA symbols of the same or different symbol durations for traffic data, signaling, and pilot and transmits the SC-FDMA symbols.

主权项

1. An apparatus for wireless communication, comprising:
a processor operative to generate a modulation symbol for control information, to spread the modulation symbol for the control information with a spreading code by replicating the modulation symbol L times and multiplying the replicated modulation symbols with L chips of the spreading code to obtain L spread modulation symbols, where L is a length of the spreading code, and to generate at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols and a set of contiguous subcarriers used for transmission; and a memory coupled to the processor.