Multiple-input multiple-output communication system
First Claim
1. A multiple-input multiple-output (MIMO) communication system comprising a base station and a relay station that are connected through an optical fiber, said MIMO communication system wirelessly transmitting through a plurality of antennas at the relay station a signal received from the base station, wherein the base station comprises:
- a plurality of symbol mappers mapping input bit streams into respective symbol signals;
a MIMO multiplexer for generating a plurality of respective exchange signals by exchanging bits of the respective symbol signals; and
a plurality of code spreaders for generating a plurality of spread signals by band spreading the exchange signals.
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Accused Products
Abstract
A multiple-input multiple-output (MIMO) communication system includes a base station and a relay station that are connected through an optical fiber. The relay station wirelessly transmits through a plurality of antennas a signal received from the base station. The base station includes a plurality of symbol mappers for mapping input bit streams into a plurality of symbol signals; a MIMO multiplexer generating a plurality of exchange signals by exchanging bits of the symbol signals; and a plurality of code spreaders generating a plurality of spread signals by band spreading the exchange signals. The adoption of a wire transmission scheme for connecting the base station with the relay station through a single optical fiber provides benefits in cost reduction and complexity as the number of electrical-to-optical converters is reduced, and the bandwidth is superior to those in wireless transmission scheme
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Citations
13 Claims
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1. A multiple-input multiple-output (MIMO) communication system comprising a base station and a relay station that are connected through an optical fiber, said MIMO communication system wirelessly transmitting through a plurality of antennas at the relay station a signal received from the base station, wherein the base station comprises:
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a plurality of symbol mappers mapping input bit streams into respective symbol signals; a MIMO multiplexer for generating a plurality of respective exchange signals by exchanging bits of the respective symbol signals; and a plurality of code spreaders for generating a plurality of spread signals by band spreading the exchange signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for multiple-input multiple-output (MIMO) communication system having a base station and a relay station that are connected through a single optical fiber, said MIMO communication system wirelessly transmitting through a plurality of antennas at the relay station a signal received from the base station, wherein the method of transmission at the base station to the relay station includes the following steps:
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demultiplexing an input signal into a plurality of respective bit streams; encoding the plurality of respective bit streams; mapping the plurality of respective input bit streams into respective symbol signals; generating a plurality of respective exchange signals by exchanging bits of the respective symbol signals; generating a plurality of spread signals by band spreading the exchange signals; adding I signals and Q signals included in the plurality of spread signals, respectively; multiplexing the added I signals and Q signals; and converting the multiplexed electrical signal into an optical signal for transmission to the relay station through the single optical fiber.
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13. A method for multiple-input multiple-output (MIMO) communication system having a base station and a relay station that are connected through a single optical fiber, said MIMO communication system wirelessly transmitting through a plurality of antennas at the relay station a signal received from the base station, wherein the method of wireless transmission by the relay station of the signal received from the base station via the optical fiber includes the following steps:
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restoring with a plurality of code despreaders a plurality of exchange signals from a plurality of spread signals received from the base station; IQ modulating the exchange signals output from the code despreaders into a plurality of respective modulated signals; converting the plurality of modulated signals into respective RF signals for wireless transmission; and wirelessly transmitting into free space the output RF signals.
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Specification