Guide Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN

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A method by which the MS detects a specific preamble sequence may employ an auto-correlation technique in a time domain or in a frequency domain. In step , the MS detects an initial operating mode by using the received specific preamble, and then proceeds to step In step , the MS demodulates and decodes an FCH according to the detected initial operating mode to extract related information, and then proceeds to step In step , the MS decodes downlink data received for a downlink frame period or transmits data to the BS for an uplink frame period.

As describe above, the present invention proposes new preamble sequences for enabling an initial operating mode to be selectively determined, and thus an MS can selectively determine the initial operating mode according to the detection of the preamble sequence. Thus, the preamble sequences of the present invention can be applied to a system which does not fixedly operate, but flexibly operates the initial operating mode.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Effective date : Year of fee payment : 4. Year of fee payment : 8. Disclosed is a method for detecting an initial operating mode in an OFDMA wireless communication system the method includes receiving from a BS a reference signal having a specific pattern, and detecting an initial operation mode according to the received reference signal.

Field of the Invention The present invention relates to a method for detecting an operating mode in a wireless communication system, and more particularly to a method for detecting an initial operating mode in a wireless communication system employing an Orthogonal Frequency Division Multiple Access OFDMA scheme.

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A brief discussion about the respective data transmission sections is as follows. In order to accomplish the above-mentioned object, in accordance with a second aspect of the present invention, there is provided a method for selectively determining and detecting an initial operating mode in an OFDMA wireless communication system, the method includes generating a reference signal corresponding to a predetermined initial operating mode and receiving from a BS a reference signal, which has a specific pattern as presented below in Table 1, TABLE 1 FFT Sequence PAPR size No.

In order to accomplish the above-mentioned object, in accordance with a third aspect of the present invention, there is provided a method for selectively determining and detecting an initial operating mode in an OFDMA wireless communication system, the method includes generating a reference signal corresponding to a predetermined initial operating mode and receiving from a BS a reference signal, which has a specific pattern as presented below in Table 2, TABLE 2 FFT Sequence PAPR size No. In order to accomplish the above-mentioned object, in accordance with a fourth aspect of the present invention, there is provided a method for selectively determining and detecting an initial operating mode in an OFDMA wireless communication system, the method includes generating a reference signal corresponding to a predetermined initial operating mode and receiving from a BS a reference signal, which has a specific pattern as presented below in Table 3, TABLE 3 FFT Sequence PAPR size No.

A method for acquiring synchronization in an Orthogonal Frequency Division Multiple Access OFDMA wireless communication system, the method comprising: generating and transmitting, in a transmitter, a first sequence for acquiring synchronization with a receiver;. A method for acquiring synchronization in an Orthogonal Frequency Division Multiple Access OFDMA wireless communication system, the method comprising: generating and transmitting, in a transmitter, a first sequence for acquiring synchronization with a receiver,.

A method for operating a transmitter in order to acquire synchronization in an Orthogonal Frequency Division Multiple Access OFDMA wireless communication system, the method comprising: generating a first sequence for acquiring synchronization with a receiver; and. A method for operating a receiver in order to acquire synchronization in an Orthogonal Frequency Division Multiple Access OFDMA wireless communication system, the method comprising: receiving a first sequence from a transmitter; and.

USB2 en. EPB1 en. JPB2 en. KRB1 en. CNB en. AUB2 en. CAC en. DET2 en.

Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN (2004)

RUC2 en. WOA1 en. Method and apparatus for communicating by use of relaying system in a cognitive radio technique. Method for configurating basic signal allocation unit and method for transmitting signals using the same.

Code division multiplexing in a single-carrier frequency division multiple access system. Pilot signal transmission for an orthogonal frequency division wireless communication system. Systems and methods for beamforming feedback in multi antenna communication systems. Varied signaling channels for a reverse link in a wireless communication system.

Systems and methods for beamforming and rate control in a multi-input multi-output communication systems. Method and apparatus for providing antenna diversity in a wireless communication system. Multi mode host interface for and remote register and memory access of a wireless communication module. Mapping of preamble sequence sets with frame control header FCH location for multi-hop wireless broadband access communications. Multi-phase frame structure to support multi-hop wireless broadband access communications.

UAC2 en. Coexistence support method considering subchannel allocation in a broadband wireless access system. Method for supporting coexistence with considering subchannel allocation in a broadband wireless access system. EPA3 en. Apparatus and method for generating synchronization channel in a wireless communication system. Apparatus and method for generating synchronization channel in wireless communication system. Terminal device and method for transmitting a power headroom report in a wireless communication system supporting multiple component carriers. Method and apparatus for transmission and reception reference signal in wireless communication system.

Method and apparatus for transmitting channel status information in a carrier aggregation system. Communication device, transmitting device, receiving device, and communication system. Method and apparatus for transmitting or receiving wireless signal in wireless communication system. The Release 1 system profile requires that the SS supports two streams and spatial multiplexing in the downlink and two-user collaborative spatial multiplexing in the uplink, implying a minimum configuration of one transmit and two receiver antennas.

Two-user collaborative spatial multiplexing is a 2 x 2 system where two SSs are used, each transmitting one stream. The advanced features and technologies involved in the standard present many challenges in designing, developing, and manufacturing WiMAX products.

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These are especially prevalent in the RF section of a design. One of the biggest is the close spacing of the OFDM subcarriers.


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Wireless systems with closely spaced OFDM subcarriers are more susceptible to carrier frequency error and phase noise produced by the local oscillator of the radio. Phase noise can cause inter-carrier interference ICI and degrade system performance. The issue is complicated further since the subcarrier frequency spacing is different in mobile and fixed WiMAX.

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In mobile WiMAX system design, it is important to consider the carrier frequency shift or spread due to the Doppler effects caused by the relative movement of the mobile station in the surrounding environment, which has similar impact on system performance as phase noise. Other WiMAX design challenges include high transmit power requirements in conjunction with tight spectrum mask requirements and a stricter error vector magnitude EVM requirement for Tx.

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This radio architecture is sensitive to analog implementation such as PCB trace layout and component variation. Imbalances between I and Q signal paths will directly affect modulation accuracy and, consequently, transmit signal quality. To optimize overall system performance, it is necessary for the baseband IC to compensate for any I-Q imbalances.

Other impairments such as carrier frequency error, phase noise, LO leakage, spurious interference, and power-amplifier compression also will affect WiMAX system performance.

Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN.

EVM provides an indication of the overall transmit signal quality and is a direct measure of the average symbol constellation error. Through analysis of the unique characteristics of the symbol constellation diagram, a designer can uncover relationships between constellation distortion and deterministic impairments such as IQ imbalance. Random phase noise has a unique impact on the symbol constellation. Nonlinearity effects due to the compression of the amplifier also can be seen from the symbol constellation distortion.

Through measurements of transmit power spectrum density, complementary cumulative distribution function CCDF , EVM, and carrier phase noise, design engineers can identify the source of impairments that degrade WiMAX transmitter performance. For example, with phase imbalance, an 8 x 8 square constellation diagram showing QAM modulation states becomes slightly trapezoidal.

In contrast, amplitude imbalance broadens each of the states, but the overall constellation remains square. Test solutions such as IQmax from LitePoint that combine vector signal analyzer and vector signal generator capabilities are powerful tools to identify and troubleshoot WiMAX designs. A vector signal analyzer VSA can perform measurements in the time domain, frequency domain, and modulation domain.


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  • VSAs enable designers to determine the impacts of amplitude, phase, and group delay imbalances among I and Q channels, phase noise, spurious signals, transient effects, and signal compression on transmitter performance. WiMAX signals occupy a wider signal bandwidth than typical cell phone signals and are more sensitive to group delay. The subcarriers farther away from the RF carrier frequency on both the lower and higher side will experience more delay than those close to the center frequency, causing more EVM degradation at these subcarriers Figure 2.

    Figure 2. EVM vs. System engineers also need to take phase noise into consideration. It usually is introduced during frequency conversion when a baseband signal is mixed with a local oscillator LO to translate to RF frequency. LO phase noise consists of contributions from the frequency stability of the reference crystal oscillator, the frequency stability of the free-running voltage-controlled oscillator VCO used by the phase-locked loop PLL , and the loop bandwidth and noise from the PLL used in the frequency synthesizer.

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    A scalable physical layer enables standard-based solutions to deliver optimum performance in channel bandwidths ranging from 1. View PDF.

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