摘要:
A parabolic cylindrical reflector antenna that comprises two or more antenna feeds each directed towards a parabolic cylindrical reflector, wherein the antenna feeds are positioned in one or more line-arrays parallel to a focal line of the parabolic cylindrical reflector, and the line-array is substantially centered opposing the reflector. The antenna comprises a controller configured to scan along a straight edge of the reflector by electronically adjusting a phase of each of the antenna feeds, thereby changing the incident angle of an energy beam relative to the reflector. The controller is configured to scan along a curved edge of the reflector by moving, using a mechanical positioning mechanism, the antenna feeds in a direction parallel to a directrix of the reflector while maintaining the positioning or by electronically selecting one of two or more parallel line-arrays.
摘要:
An approach is provided for supporting retrieval of web content over a meshed communication network (111). A first server (105) receives a request from a browser application (103) for the content resident in the web server (109). The first server (105) includes a downstream proxy (401) configured to modify the request to include information specifying support of a parse and pre-fetch service within an optional header field of the request as to permit handling of the modified request by the web server (109) in absence of an upstream proxy (403) that is communicating with the web server (109). A second server (107) is configured as the upstream proxy (403) to intercept the modified request and pre-fetch the content from the web server (109). The second server (107) forwards the pre-fetched content over the communication network (111) to the first server (105). This approach has particular applicability in relatively high latency networks, such as a satellite communications system.
摘要:
A regulated delay line device includes main regulator coupled to a node, and a plurality of delay branches coupled to the node to receive a voltage output to the node by the main regulator. Each of the plurality of delay branches includes a micro-regulator and a delay line. The delay line is coupled to the micro-regulator such that unfiltered noise is removed locally at each delay branch by a corresponding micro-regulator.
摘要:
Phase interpolation techniques for voltage-controlled delay line (VCDL) implementation are provided. The techniques of the invention may employ a second-order phase interpolation topology to improve tuning range performance of the VCDL over process and temperature variation. In one aspect of the invention, the technique may use a complementary input signal to set an absolute 180-degree phase reference. As a result, the maximum tuning range of 180 degrees can be achieved regardless of internal delay variation.
摘要:
A method of differentially controlling an LC voltage controlled oscillator (VCO) includes providing an LC-VCO comprising at least one inductor, measuring an inductor common voltage (CMV) output at a point along the at least one inductor, utilizing the measured inductor CMV as an input to a charge pump, and outputting from the charge pump a plurality of differential control voltages to control an output of the LC-VCO.
摘要:
An approach for providing flow control in a radio communication system is disclosed. A request from a non-satellite system specific side of a transport interface is made to a system specific side of the transport interface for a flow control allocation that specifies an amount of data to be stored in a queue of the system specific side of the transport interface. The system specific side supports a signaling function that is based on a transmission characteristic of the radio communication system. The flow control allocation is generated based upon availability of the queue, wherein the destination address is a link layer address of the satellite communication system. This arrangement has particular applicability to a satellite network (e.g., Very Small Aperture Terminal (VSAT) network) that provides data communication services.
摘要:
A method and system are disclosed for calibrating a mid-voltage node in an integrated circuit including an input-output circuit having charge-recycling stacked voltage domains including at least first and second voltage domains. In one embodiment, the method comprises transmitting data through the input-output circuit, including transmitting a first portion of the data across the first voltage domain, and transmitting a second portion of the data across the second voltage domain. The method further comprises measuring a specified characteristic of the data transmitted through the input-output circuit; and based on the measured specified characteristic, adjusting a voltage of said mid-voltage node to a defined value. The voltage of the mid-voltage node may be adjusted to accomplish a number of objectives, for example, to achieve a desired trade-off between power and performance, or so that the two voltage domains have the same performance.
摘要:
In the context of high-speed serial links, data-dependent jitter compensation techniques performed using phase pre-distortion. Broadly contemplated is an expansion of the notion of pre-emphasis beyond conventional amplitude compensation of ISI, whereby phase pre-emphasis for compensating data-dependent jitter (DDJ) is introduced. DDJ can be addressed by exploiting the relationship between the data sequence and the timing deviation. Phase pre-emphasis improves the signal integrity with little additional power consumption in the transmitter and with no cross-talk penalty.
摘要:
Phase interpolation techniques for voltage-controlled delay line (VCDL) implementation are provided. The techniques of the invention may employ a second-order phase interpolation topology to improve tuning range performance of the VCDL over process and temperature variation. In one aspect of the invention, the technique may use a complementary input signal to set an absolute 180-degree phase reference. As a result, the maximum tuning range of 180 degrees can be achieved regardless of internal delay variation.