Abstract: A game piece management system comprising a piece sales system for allowing players to purchase pieces operable for playing at least one game, an account management system for maintaining player accounts, each player account identifying pieces owned by a player, and, a game interface for providing the player with access to a game session of an online game, the game interface allowing the player to select at least one piece from the player's account for use as an active piece in the game session. The player's active piece interacts with another player's active piece in the game session under control of the player, such that if the player's active piece neutralizes the other player's active piece, the other player's neutralized active piece becomes available to be obtained by the player.

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated by frequency demodulating the phase-modulated signal. The phase-modulated signal is separated into first and second copies, the first copy is phase demodulated to generate demodulated symbols, and the second copy is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to generate event signals having signature properties (signature events). These signature events are used in traditional Time Difference of Arrival tdoa algorithms to accurately determine position of a mobile unit in the wireless communication system.