摘要:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.
摘要:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between user data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between the different user data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.
摘要:
A method and system for adaptive control of sub-carriers is useful for increasing frequency diversity gain to improve bit error rate performance in an Interleaved Frequency Division Multiple Access (IFDMA) system. The method includes selecting a combination of a Repetition Factor (RF) and a repetition block size (Q), from possible combinations of a RF and a Q, based on a number of users (Nu) (step 1405). A Spreading Factor (SF), Forward Error Correction (FEC) coding rate (R), or modulation order (M) based on the Nu is then determined (step 1410). Control signals are then provided based on the RF and Q, and based on the SF, R, or M (step 1415).
摘要:
The present invention provides a method of operation for a variable transmission mode multi-carrier communication system by receiving a signal, determining a link quality as a function of the received signal, and selecting a compound multi-carrier communication mode as a function of the link quality.
摘要:
A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between user data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between the different user data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.
摘要:
A method in a wireless communication terminal includes receiving configuration signaling for transmitting on a first set of radio resources wherein transmitting only on the first set of radio resources leads to a time-domain periodic repetitive pattern of transmissions from the terminal in a transmission interval that causes interference to a companion device communicably coupled to the wireless communication terminal. The terminals selects a second set of radio resources for transmitting on in the transmission interval such that transmissions on a combination of the second set of radio resources and the first set of radio resources does not lead to a periodic repetitive pattern of transmissions from the terminal in the transmission interval.
摘要:
A method and apparatus for power allocation for overlapping transmissions is provided herein. During operation, user equipment will determine if transmissions to a single base station, on various frequencies, will be overlapping. If so, a determination is made to back off the power for at least one transmission on one frequency.
摘要:
A downlink subframe on a single downlink carrier supports physical layer acknowledgment signaling for multiple physical uplink shared channel (PUSCH) transmissions. The physical layer acknowledgement signaling may take the form of physical hybrid ARQ indicator channel (PHICH) signaling. A base unit reserves resource elements groups (REGs) for default PHICH signaling of default PUSCH transmissions. The base unit reserves control channel elements (CCEs) for physical downlink control channel (PDCCH) signaling. A CCE contains multiple interleaved REGs. The base unit takes any unreserved CCEs and maps those CCEs for physical layer acknowledgement signaling of additional PUSCH transmissions.
摘要:
A wireless communication terminal that has the self-interference due to the support of carrier aggregation, aggregating and jointly using two or more component carriers for transmission and reception, performs a first set of measurements on a received signal on a first operating frequency, wherein the first set of measurements are performed during which the wireless terminal transmits or receives signals on a second operating frequency. In an alternative embodiment, the wireless communication terminal changes the maximum transmit power limit on a first operating frequency on a per-slot basis to reduce the impact of harmonic or intermodulation distortion on a received signal at a second operating frequency.
摘要:
A wireless communication terminal receives a first set of pilot signal resource elements and control information in spatial layers in a first resource block in a subframe and a second set of pilot signal resource elements and data in spatial layers in a second resource block in the subframe, wherein the first and second resource blocks span a set of time symbols in a sub-frame, the first resource blocks span a first set of frequency carriers in the sub-frame, and the second resource blocks span a second set of frequency carriers in the sub-frame. The terminal decodes the spatial layers in which the control information is received using the first set of pilot signal resource elements. The terminal also decodes the spatial layers in which the data are received in the second resource block using the second set of pilot signal resource elements.