Generating a composite signal with code division multiplexing (CDM) and time division multiplexing (TDM) pilots
First Claim
Patent Images
1. A method performed by a base station (BS), the method comprising:
- generating, by the BS, a first pilot sequence, wherein the first pilot sequence is a code division multiplexing (CDM) pilot sequence and is spread with a first channelization code;
generating, by the BS, a second pilot sequence, wherein the second pilot sequence is a plurality of time division multiplexing (TDM) pilot sequences including a cyclic prefix and is spread with a second channelization code;
performing, by the BS, a scrambling operation on the first pilot sequence and the second pilot sequence during substantially overlapping plurality of time slots;
transmitting, by the BS, data, the first pilot sequence and the second pilot sequence during the substantially overlapping plurality of time slots as a composite signal,wherein the composite signal is within a designated or pre-defined time region such that the first pilot sequence has non-cyclic properties over the designated or pre-defined time region;
wherein the second pilot sequence is composed such that the composite signal has a cyclic prefix time domain structure within the designated or pre-defined time region; and
wherein the cyclic prefix includes a replicated portion of a base portion of the composite signal.
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Abstract
A composite signal may be generated with code division multiplexing (CDM) and time division multiplexing (TDM) pilots. A first pilot sequence may be a CDM pilot sequence. A second pilot sequence may have TDM pilot sequences including a cyclic prefix. The composite signal may have a cyclic prefix time domain portion based on the cyclic prefix and a base portion of the composite signal.
18 Citations
12 Claims
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1. A method performed by a base station (BS), the method comprising:
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generating, by the BS, a first pilot sequence, wherein the first pilot sequence is a code division multiplexing (CDM) pilot sequence and is spread with a first channelization code; generating, by the BS, a second pilot sequence, wherein the second pilot sequence is a plurality of time division multiplexing (TDM) pilot sequences including a cyclic prefix and is spread with a second channelization code; performing, by the BS, a scrambling operation on the first pilot sequence and the second pilot sequence during substantially overlapping plurality of time slots; transmitting, by the BS, data, the first pilot sequence and the second pilot sequence during the substantially overlapping plurality of time slots as a composite signal, wherein the composite signal is within a designated or pre-defined time region such that the first pilot sequence has non-cyclic properties over the designated or pre-defined time region; wherein the second pilot sequence is composed such that the composite signal has a cyclic prefix time domain structure within the designated or pre-defined time region; and wherein the cyclic prefix includes a replicated portion of a base portion of the composite signal. - View Dependent Claims (2, 3, 4)
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5. A base station (BS) comprising:
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a processor configured to generate a first pilot sequence, wherein the first pilot sequence is a code division multiplexing (CDM) pilot sequence and is spread with a first channelization code; the processor further configured to generate a second pilot sequence, wherein the second pilot sequence is a plurality of time division multiplexing (TDM) pilot sequences including a cyclic prefix and is spread with a second channelization code; the processor further configured to perform a scrambling operation on the first pilot sequence and the second pilot sequence during substantially overlapping plurality of time slots; a transmitter configured to transmit, data, the first pilot sequence and the second pilot sequence during the substantially overlapping plurality of time slots as a composite signal, wherein the composite signal is within a designated or pre-defined time region such that the first pilot sequence has non-cyclic properties over the designated or pre-defined time region; wherein the second pilot sequence is composed such that the composite signal has a cyclic prefix time domain structure within the designated or pre-defined time region; and wherein the cyclic prefix includes a replicated portion of a base portion of the composite signal. - View Dependent Claims (6, 7, 8)
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9. A method performed by a wireless communication unit, the method comprising:
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receiving, by the wireless communications unit on substantially overlapping plurality of time slots, a composite signal, wherein the composite signal includes data symbols, a first pilot sequence, wherein the first pilot sequence is a code division multiplexing (CDM) pilot sequence and is spread with a first channelization code, and a second pilot sequence, wherein the second pilot sequence is a plurality of time division multiplexing (TDM) pilot sequences including a cyclic prefix and is spread with a second channelization code; wherein the composite signal is received within a designated or pre-defined time region such that the first pilot sequence has non-cyclic properties over the designated or pre-defined time region; wherein the second pilot sequence is composed such that the composite signal has a cyclic prefix time domain structure within the designated or pre-defined time region; wherein the cyclic prefix includes a replicated portion of a base portion of the composite signal; descrambling, by the wireless communication unit, the composite signal with a non-cyclic scrambling code; and demodulating, by the wireless communications unit, the composite signal to recover the data symbols based on the first pilot sequence or the second pilot sequence. - View Dependent Claims (10)
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11. A wireless communications unit comprising:
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a receiver configured to receive, on substantially overlapping plurality of time slots, a composite signal, wherein the composite signal includes data symbols, a first pilot sequence, wherein the first pilot sequence is a code division multiplexing (CDM) pilot sequence and is spread with a first channelization code, and a second pilot sequence, wherein the second pilot sequence is a plurality of time division multiplexing (TDM) pilot sequences including a cyclic prefix and is spread with a second channelization code; wherein the composite signal is received within a designated or pre-defined time region such that the first pilot sequence has non-cyclic properties over the designated or pre-defined time region; wherein the second pilot sequence is composed such that the composite signal has a cyclic prefix time domain structure within the designated or pre-defined time region; wherein the cyclic prefix includes a replicated portion of a base portion of the composite signal; a processor configured to descramble the composite signal with a non-cyclic scrambling code; and the processor configured to demodulate the composite signal to recover the data symbols based on the first pilot sequence or the second pilot sequence. - View Dependent Claims (12)
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Specification