A joint power control and space-time diversity scheme is proposed for uplink and downlink. In the uplink, mobile powers and equalization/diversity combining vectors at base stations are calculated jointly. The mobile transmitted power is minimized while the Signal to Noise Ratio (SNR) at each link is maintained above a threshold. A multitap transmit diversity scheme for the downlink is also pro...

TCP-based data flows generate packets and ACKs in two directions, be it in the wireline or wireless networks. In the latter case, packets are typically found in the downlink whereas ACKs are in the uplink. Those two links are asymmetric in the case of CDMA-based High Data Rate (HDR)/High-Speed Downlink Packet Access (HSDPA) systems, the uplink being much slower than the downlink and thus, in so...

This paper deals with spreading sequences selection for downlink and uplink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems with the aim of minimizing the dynamic range of the transmitted multicarrier signal envelope and the multiple access interference. The crest factor of orthogonal and non-orthogonal sequences are compared analytically and by simulation for downlink and uplink ...

Round Robin based Intermittent Periodic Transmit (RR-IPT) has been proposed which achieves highly efficient multi-hop relays in multi-hop wireless backhaul networks (MWBN) where relay nodes are 2-dimensionally deployed. This paper newly investigates multi-channel packet scheduling and forwarding scheme for RR-IPT. Downlink traffic is forwarded by RR-IPT via one of the channels, while uplink tra...

A multibeam adaptive antenna at a basestation can separate spectrally and temporally overlapped signals in a TDMA mobile communication system. Thus, we can achieve space division multiple access (SDMA), which increases the channel capacity. For an uplink channel, weight vectors can be determined by applying a conventional method. In this paper, we consider the weight vectors for a downlink chan...

Linear (translation), hard-limited, and demod/remod types of satellite repeaters are considered in this paper. Both uncoded and coded multiple phase shift keyed (MPSK) signals are assumed to be transmitted through these repeaters. Relative performances of these repeaters in the presence of uplink and downlink noises are then compared quantitively. Probabilities of bit errors and the computation...

This specification defines a new mobility option for allowing the mobile access gateway and the local mobility anchor to negotiate Generic Routing Encapsulation (GRE) encapsulation mode and exchange the downlink and uplink GRE keys that are used for marking the downlink and uplink traffic that belong to a specific mobility session. In addition, the same mobility option can be used to negotiate ...

High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA) optimize UMTS for packet data services in the downlink and uplink, respectively. Together, they are referred to as High Speed Packet Access (HSPA). Within 3GPP Release 7, 8, 9 and 10, further improvements to HSPA have been specified in the context of HSPA+ or HSPA evolution. This Application Note describes how...

Simultaneous downlink performance improvement and uplink wavelength reuse in a full-duplex millimeter-wave (MMW) radio-overfiber (RoF) system by using a simple and cost-effective all-fiber optical interleaver are proposed and demonstrated. TheMMWRoF downlink performance improvement is based on suppressing optical carrier-to-sideband ratio (OCSR), with which the mechanism is confirmed by theoret...

This specification defines a new mobility option for allowing the mobile access gateway and the local mobility anchor to negotiate Generic Routing Encapsulation (GRE) encapsulation mode and exchange the downlink and uplink GRE keys that are used for marking the downlink and uplink traffic that belong to a specific mobility session. In addition, the same mobility option can be used to negotiate ...